{"draftJsState":{"blocks":[{"data":{},"depth":0,"entityRanges":[{"key":0,"length":18,"offset":201}],"inlineStyleRanges":[],"text":"Всем привет! Сегодня у нас новый формат: вопросы будут вместе с краткими ответами \uD83D\uDD25\uD83D\uDD25\uD83D\uDD25 Само собеседование больше похоже на некий срез, потому что обошли много тем. Можете проверить себя \uD83D\uDE0E\uD83D\uDE0E\uD83D\uDE0E Ссылка на канал в телеграмме. Не забывайтесь подписываться \uD83D\uDE80\uD83D\uDE80\uD83D\uDE80\n\n1. Что такое ARC, для чего нужно, когда работает?","type":"unstyled","key":"aum4u"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":34,"offset":0,"style":"BOLD"},{"length":24,"offset":121,"style":"BOLD"}],"text":"ARC (Automatic Reference Counting) — это технология управления памятью, используемая в Swift и Objective-C. Она работает только с reference types (классы, замыкания).","type":"unstyled","key":"l93l"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":0,"style":"BOLD"}],"text":"Как работает:","type":"unstyled","key":"cufv6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Каждый объект класса имеет счетчик сильных ссылок (retain count), хранящийся в его заголовке (обычно 64 бита, часть — для других флагов).","type":"unordered-list-item","key":"3ghcp"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"При создании объекта счетчик = 1.","type":"unordered-list-item","key":"5jkje"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"При присваивании новой сильной ссылки (let x = object) компилятор вставляет вызов swift_retain(object) — счетчик увеличивается.","type":"unordered-list-item","key":"3ncle"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"При выходе ссылки из области видимости или переприсваивании вставляется swift_release(object) — счетчик уменьшается.","type":"unordered-list-item","key":"7e7oj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Когда счетчик становится 0, объект немедленно уничтожается (вызывается deinit, память освобождается).","type":"unordered-list-item","key":"e9egv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":14,"offset":0,"style":"BOLD"},{"length":9,"offset":30,"style":"BOLD"}],"text":"Когда работает: ARC действует постоянно во время выполнения программы. Каждый доступ к ссылочному объекту (присваивание, передача в функцию, возврат, добавление в массив) может изменить счетчик.","type":"unstyled","key":"4nd04"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":0,"style":"BOLD"}],"text":"Зачем нужен: Чтобы программист не писал вручную retain/release (как в MRC в Objective-C). ARC автоматизирует это на этапе компиляции, не требуя сборщика мусора.","type":"unstyled","key":"f8esr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":5,"offset":0,"style":"BOLD"}],"text":"Важно: ARC не предотвращает и не разрушает циклические ссылки. Это задача программиста — использовать weak/unowned.","type":"unstyled","key":"5p310"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"2. Чем ARC отличается от Garbage Collector?","type":"header-two","key":"cogah"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":0,"style":"BOLD"}],"text":"Сравнение:\n","type":"header-three","key":"5o72h"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":13,"offset":0,"style":"BOLD"},{"length":12,"offset":120,"style":"BOLD"},{"length":6,"offset":222,"style":"BOLD"},{"length":19,"offset":299,"style":"BOLD"},{"length":18,"offset":419,"style":"BOLD"},{"length":7,"offset":544,"style":"BOLD"},{"length":4,"offset":671,"style":"BOLD"},{"length":3,"offset":13,"style":"ITALIC"},{"length":3,"offset":132,"style":"ITALIC"},{"length":3,"offset":228,"style":"ITALIC"},{"length":3,"offset":318,"style":"ITALIC"},{"length":3,"offset":437,"style":"ITALIC"},{"length":3,"offset":551,"style":"ITALIC"}],"text":"Время работы\nARC На этапе компиляции вставляются вызовы retain/release\nGC Во время выполнения работает отдельный поток \nДетерминизм\nARC Объект удаляется сразу, когда счетчик = 0\nGC Удаление отложено до следующего цикла GC\nПаузы\nARC Нет пауз\nGC Возможны \"stop-the-world\" паузы (особенно в старых GC)\nЦиклические ссылки\nARC Приводят к утечкам, нужно weak/unowned\nGC Обрабатываются автоматически (GC видит недостижимость)\nНакладные расходы\nARC На каждый retain/release — небольшие, но частые\nGC Периодически большие затраты на маркировку и сжатие\nПамять\nARC Освобождается сразу, пики использования ниже\nGC Может держать память дольше, но лучше общая пропускная способность\n\nИтог: ARC лучше для систем, где важна предсказуемость задержек (UI, игры, аудио). GC лучше для серверов с большим количеством краткоживущих объектов.","type":"unstyled","key":"1uq3r"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"3. Какие есть возможности для исправления Retain Cycle?","type":"header-two","key":"1irn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Retain cycle (цикл сильных ссылок) — когда объекты A и B сильно ссылаются друг на друга (или цепочка ссылок возвращается к началу). Ни один не может быть удален, даже если они не нужны.","type":"unstyled","key":"8njks"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":19,"offset":0,"style":"BOLD"}],"text":"Способы исправления:","type":"unstyled","key":"8tdo6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":0,"style":"BOLD"},{"length":101,"offset":114,"style":"ITALIC"}],"text":"weak ссылка — превращает одну из ссылок в опциональную, которая автоматически становится nil при удалении объекта\nParent {\n var child: Child?\n}\nclass Child {\n weak var parent: Parent? // weak разрывает цикл\n}","type":"ordered-list-item","key":"8vjap"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":14,"offset":0,"style":"BOLD"},{"length":90,"offset":118,"style":"ITALIC"}],"text":"unowned ссылка — как weak, но не опционал. Используется, когда объект точно будет существовать всё время жизни ссылки\nChild {\n unowned let parent: Parent\n init(parent: Parent) { self.parent = parent }\n}\n","type":"ordered-list-item","key":"2h1pi"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":26,"offset":0,"style":"BOLD"},{"length":151,"offset":27,"style":"ITALIC"}],"text":"Capture list в замыканиях\n ViewController {\n var closure: (() -> Void)?\n func setup() {\n closure = { [weak self] in\n self?.doSomething()\n }\n }\n}\n","type":"ordered-list-item","key":"1v7ki"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":19,"offset":0,"style":"BOLD"}],"text":"Ручной разрыв цикла (редко, но бывает)\n cleanup() {\n self.closure = nil\n}\n","type":"ordered-list-item","key":"26bg2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":22,"offset":0,"style":"BOLD"}],"text":"Переход на value types (структуры, перечисления) — они не создают циклов, так как не используют счетчик ссылок.","type":"ordered-list-item","key":"759ot"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":70,"offset":0,"style":"BOLD"}],"text":"Использование [unowned self] только когда self точно не может быть nil (например, в анимациях, где замыкание выполняется синхронно).","type":"ordered-list-item","key":"a8p8k"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":0,"style":"BOLD"}],"text":"Диагностика: Xcode Memory Graph Debugger, Instruments (Leaks), статический анализатор.","type":"unstyled","key":"1f9gn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"4. В чем отличие weak и unowned?\n","type":"header-two","key":"hrlf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":5,"offset":12,"style":"BOLD"},{"length":30,"offset":61,"style":"BOLD"},{"length":25,"offset":176,"style":"BOLD"},{"length":13,"offset":259,"style":"BOLD"},{"length":19,"offset":322,"style":"BOLD"},{"length":14,"offset":423,"style":"BOLD"},{"length":22,"offset":533,"style":"BOLD"},{"length":4,"offset":17,"style":"ITALIC"},{"length":7,"offset":42,"style":"ITALIC"},{"length":4,"offset":91,"style":"ITALIC"},{"length":7,"offset":111,"style":"ITALIC"},{"length":4,"offset":201,"style":"ITALIC"},{"length":7,"offset":228,"style":"ITALIC"},{"length":4,"offset":272,"style":"ITALIC"},{"length":7,"offset":285,"style":"ITALIC"},{"length":4,"offset":341,"style":"ITALIC"},{"length":7,"offset":391,"style":"ITALIC"},{"length":4,"offset":437,"style":"ITALIC"},{"length":7,"offset":471,"style":"ITALIC"},{"length":4,"offset":555,"style":"ITALIC"},{"length":7,"offset":586,"style":"ITALIC"}],"text":"Сравнение:\n\nТип \nweak Всегда опционал (?)\nunowned Неопционал\nЗначение при удалении объекта\nweak Становится nil\nunowned Остается указателем на удаленную память (висячая ссылка)\nОбращение после удаления\nweak nil — можно проверить\nunowned Crash (EXC_BAD_ACCESS)\nБезопасность\nweak Высокая\nunowned Низкая (требует уверенности)\nПроизводительность\nweak Чуть медленнее (нужен рантайм для обнуления)\nunowned Быстрее (прямой доступ)\nИспользование\nweak Делегаты, произвольные связи\nunowned parent в дочерних объектах, когда parent живет дольше\nОбязательная проверка\nweak Да (if let, guard let, ?)\nunowned Нет (но нужно быть уверенным)","type":"unstyled","key":"109jc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":7,"offset":0,"style":"BOLD"}],"text":"Правило: По умолчанию используйте weak. unowned — только когда вы на 100% уверены, что объект не может быть удален раньше ссылки. Ошибка = crash.","type":"unstyled","key":"dsbv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"5. Расскажи подробнее про sideTable.","type":"header-two","key":"enp2j"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":6,"offset":113,"style":"BOLD"}],"text":"SideTable — это структура из Swift runtime (определена в swift/Runtime/HeapObject.h). Она подключается к объекту лениво, когда встроенного в заголовок объекта места недостаточно.","type":"unstyled","key":"abcr5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":42,"offset":0,"style":"BOLD"}],"text":"Стандартный заголовок объекта (HeapObject) содержит:","type":"unstyled","key":"er415"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"указатель на класс (isa)","type":"unordered-list-item","key":"4u0jt"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"inline refcount (обычно 64 бита: часть — strong count, часть — weak count, часть — флаги)","type":"unordered-list-item","key":"sjv8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Но 64 бита не могут вместить произвольное количество слабых ссылок или associated objects. Тогда создается SideTable.","type":"unstyled","key":"14tp3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":24,"offset":0,"style":"BOLD"}],"text":"Что хранится в SideTable:","type":"unstyled","key":"4d40n"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"struct SideTable {\n SpinLock lock; // для потокобезопасности\n RefCounts weakRefCount; // счетчик слабых ссылок\n WeakEntry *weakEntries; // список слабых ссылок\n ObjectAssociationMap *associations; // associated objects\n bool isDeiniting; // флаг деинициализации\n}","type":"unstyled","key":"9vg4f"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":25,"offset":0,"style":"BOLD"}],"text":"Когда создается SideTable:","type":"unstyled","key":"27pcq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Первая weak ссылка на объект","type":"unordered-list-item","key":"9ukod"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Первый вызов objc_setAssociatedObject","type":"unordered-list-item","key":"avlqi"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"При переполнении inline refcount","type":"unordered-list-item","key":"1h3qd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":29,"offset":0,"style":"BOLD"}],"text":"Как работает удаление объекта:","type":"unstyled","key":"ct4u"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Сильные ссылки обнуляются, счетчик становится 0.","type":"ordered-list-item","key":"9l16t"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Если есть SideTable — runtime проходит по weakEntries и обнуляет каждую слабую ссылку.","type":"ordered-list-item","key":"98ibc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Удаляется сам объект, затем SideTable (если она была).","type":"ordered-list-item","key":"juqt"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":16,"offset":0,"style":"BOLD"}],"text":"Почему это важно: SideTable позволяет эффективно поддерживать слабые ссылки и associated objects без выделения памяти для каждого объекта. Плата — дополнительная косвенность и блокировка (SpinLock) при доступе к SideTable.","type":"unstyled","key":"1lfpn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"6. Расскажи про capture list, про захват сильных ссылок, замыкания.","type":"header-two","key":"2mer2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":19,"offset":0,"style":"BOLD"},{"length":11,"offset":121,"style":"BOLD"}],"text":"Замыкание (closure) в Swift — это reference type. Когда замыкание использует переменные из окружающего контекста, оно их захватывает.","type":"unstyled","key":"f4flu"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"По умолчанию (без capture list):","type":"header-three","key":"5bpc4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":15,"offset":0,"style":"BOLD"},{"length":6,"offset":52,"style":"BOLD"}],"text":"Reference types (классы, замыкания) — захватываются сильно (retain).","type":"unordered-list-item","key":"454mm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":0,"style":"BOLD"}],"text":"Value types (структуры, Int, String) — копируются (но если внутри value type есть ссылка, она копируется сильно).","type":"unordered-list-item","key":"2lsgt"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Capture list — синтаксис:\n","type":"header-three","key":"6fle0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":66,"offset":0,"style":"ITALIC"}],"text":"{ [weak self, unowned delegate, x = someValue, y] in\n // тело\n}","type":"unstyled","key":"f2bn2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":16,"offset":0,"style":"BOLD"}],"text":"Варианты захвата:","type":"unstyled","key":"1s1pu"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"[self] — сильный захват self (Swift 5.3+). Используется явно.","type":"unordered-list-item","key":"9ol26"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"[weak self] — слабый опциональный захват.","type":"unordered-list-item","key":"e2ms5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"[unowned self] — безусловный захват (опасно).","type":"unordered-list-item","key":"6onsn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"[x = someValue] — захват значения someValue под именем x (копирование или strong).","type":"unordered-list-item","key":"d1i6o"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"[x] — краткая форма для захвата x (если x — value type, копия; если reference — strong).","type":"unordered-list-item","key":"d7jo5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример проблемы (retain cycle):","type":"header-three","key":"ag14r"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":161,"offset":0,"style":"ITALIC"}],"text":"\nclass ViewController {\n var onTap: (() -> Void)?\n func setup() {\n onTap = {\n self.doSomething() // сильный захват self\n }\n }\n}","type":"unstyled","key":"4j58d"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Здесь self → onTap → self (цикл).","type":"unstyled","key":"37tuo"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Исправление:\n","type":"header-three","key":"6hl5k"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":50,"offset":0,"style":"ITALIC"}],"text":"onTap = { [weak self] in\n self?.doSomething()\n}","type":"unstyled","key":"dhl0m"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Нюансы:","type":"header-three","key":"d7f27"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"[weak self] делает self опционалом внутри замыкания. Нужно писать self?. или guard let self.","type":"unordered-list-item","key":"5amst"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"[unowned self] — не опционал, но при обращении к удаленному self — crash.","type":"unordered-list-item","key":"db4hg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Если внутри замыкания несколько сильных захватов, а один weak — остальные остаются сильными, если явно не указано иное.","type":"unordered-list-item","key":"ck8bk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Замыкания, захваченные слабо, не продлевают жизнь объекту.","type":"unordered-list-item","key":"3iqbq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"7. Что будет, если все замыкание сделать escaping? Убрать все escaping? Нужен ли для опционального замыкания escaping?","type":"header-two","key":"alc08"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"@escaping — что это?","type":"header-three","key":"evttd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":30,"offset":31,"style":"BOLD"},{"length":2,"offset":101,"style":"BOLD"}],"text":"По умолчанию замыкания в Swift неэскейпинговые (non-escaping). Это значит, что замыкание выполняется до возврата из функции и не переживает её. Компилятор может оптимизировать его хранение на стеке.","type":"unstyled","key":"ta04"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"@escaping говорит: \"Это замыкание может быть сохранено и выполнено после того, как функция вернётся\".","type":"unstyled","key":"8eie1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Что будет, если все замыкания сделать escaping?","type":"header-three","key":"8nivq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":5,"offset":0,"style":"BOLD"}],"text":"Плюсы: Код станет более гибким (можно хранить, передавать в другие потоки).","type":"unordered-list-item","key":"1jcfa"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":6,"offset":0,"style":"BOLD"}],"text":"Минусы:\nКомпилятор не может оптимизировать стековое выделение.\nНужно явно указывать self в capture list (non-escaping может автоматически подразумевать self).\nУвеличивается расход памяти (замыкания попадают в кучу).\nRetain cycle становится более вероятным.\nПроизводительность чуть ниже.","type":"unordered-list-item","key":"1h3si"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Что будет, если убрать все escaping?","type":"header-three","key":"84d7i"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Большинство асинхронных API перестанут работать:swiftDispatchQueue.main.async { } // ошибка: замыкание escaping","type":"unordered-list-item","key":"2e13i"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Нельзя будет сохранить замыкание в свойство.","type":"unordered-list-item","key":"5igv2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Нельзя будет передать замыкание в другой поток.","type":"unordered-list-item","key":"8al3r"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Код станет более предсказуемым, но намного менее функциональным.","type":"unordered-list-item","key":"6p2du"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Нужен ли escaping для опционального замыкания?\n","type":"header-three","key":"308fi"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":26,"offset":0,"style":"ITALIC"},{"length":37,"offset":91,"style":"ITALIC"},{"length":55,"offset":144,"style":"ITALIC"}],"text":"var closure: (() -> Void)? // не escaping по умолчанию, но при хранении — нужно @escaping\nfunc take(closure: (() -> Void)?) { } // не escaping\nfunc takeEscaping(closure: @escaping (() -> Void)?) { } // escaping","type":"unstyled","key":"i93o"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":5,"offset":0,"style":"BOLD"}],"text":"Ответ: Опциональность не влияет на escaping. Если вы сохраняете замыкание (например, присваиваете свойству), оно должно быть @escaping. Если просто вызываете внутри функции — не нужно.","type":"unstyled","key":"hcll"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"8. Что такое associated type?","type":"header-two","key":"8rjrr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":15,"offset":0,"style":"BOLD"}],"text":"Associated type — это дженерик-заполнитель внутри протокола. Он позволяет протоколу абстрагироваться от конкретного типа, оставляя решение реализации.","type":"unstyled","key":"3kubc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример:\n","type":"header-three","key":"cu0eo"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":124,"offset":0,"style":"ITALIC"}],"text":"protocol Stack {\n associatedtype Element\n mutating func push(_ element: Element)\n mutating func pop() -> Element?\n}","type":"unstyled","key":"bq18"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Реализации:\n","type":"header-three","key":"78v29"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":242,"offset":0,"style":"ITALIC"},{"length":202,"offset":244,"style":"ITALIC"}],"text":"struct IntStack: Stack {\n typealias Element = Int // можно явно, но Swift выведет сам\n private var items: [Int] = []\n mutating func push(_ element: Int) { items.append(element) }\n mutating func pop() -> Int? { items.popLast() }\n}\n\nstruct GenericStack: Stack {\n private var items: [Element] = []\n mutating func push(_ element: Element) { items.append(element) }\n mutating func pop() -> Element? { items.popLast() }\n}","type":"unstyled","key":"dtae5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Ограничения:","type":"header-three","key":"a40v1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Протокол с associated type нельзя использовать как обычный тип: var stack: Stack — ошибка. Нужен type erasure (AnyStack) или some Stack.","type":"unordered-list-item","key":"c7963"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Associated types могут иметь требования (например, associatedtype Element: Hashable).","type":"unordered-list-item","key":"fhdmu"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Связь с дженериками:","type":"header-three","key":"can7d"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Дженерик-класс: тип указывается при объявлении переменной.\nAssociated type: тип определяется реализацией протокола.","type":"unstyled","key":"28bmc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"9. Что такое Hashable, для чего нужен? Что такое коллизия?","type":"header-two","key":"2if2o"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":8,"offset":0,"style":"BOLD"}],"text":"Hashable — протокол, требующий от типа способности вычислять хеш-значение. Наследуется от Equatable (нужно уметь сравнивать на равенство).","type":"unstyled","key":"a4qce"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Требования:\n","type":"header-three","key":"fl612"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":73,"offset":0,"style":"ITALIC"}],"text":"protocol Hashable: Equatable {\n func hash(into hasher: inout Hasher)\n}","type":"unstyled","key":"6n389"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Где нужен Hashable:","type":"header-three","key":"5s4e6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Ключи в Dictionary (ключ должен быть хешируемым)","type":"unordered-list-item","key":"1nqe0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Элементы в Set","type":"unordered-list-item","key":"7ean2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Использование в качестве enum с raw value (тоже требует Hashable)","type":"unordered-list-item","key":"6qvda"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Ускорение поиска, сравнения","type":"unordered-list-item","key":"4mmiv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Как работает:","type":"header-three","key":"457r8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"hash(into:) смешивает свойства объекта в Hasher.","type":"ordered-list-item","key":"eumqf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Hasher использует алгоритм (SipHash-1-3, затем — более новый) для получения 64-битного хеша.","type":"ordered-list-item","key":"864u9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Dictionary использует хеш для определения корзины (bucket index).","type":"ordered-list-item","key":"f6s8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Коллизия — что это?","type":"header-three","key":"99t3o"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":8,"offset":0,"style":"BOLD"}],"text":"Коллизия — ситуация, когда два разных объекта дают одинаковый хеш.","type":"unstyled","key":"743j7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":36,"offset":0,"style":"BOLD"}],"text":"Как Dictionary обрабатывает коллизии:","type":"unstyled","key":"6l32v"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":18,"offset":0,"style":"BOLD"}],"text":"Открытая адресация (Swift Dictionary использует что-то близкое к этому): ищет следующую свободную корзину.","type":"unordered-list-item","key":"11u8b"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":7,"offset":0,"style":"BOLD"}],"text":"Цепочки (Java HashMap): каждая корзина — это связный список.","type":"unordered-list-item","key":"9pqq7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":20,"offset":0,"style":"BOLD"}],"text":"Последствия коллизий:","type":"unstyled","key":"djp4b"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Поиск/вставка/удаление из O(1) может деградировать до O(n) в худшем случае.","type":"unordered-list-item","key":"f2rrl"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Хорошая хеш-функция минимизирует коллизии.","type":"unordered-list-item","key":"9fsfd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример реализации:\n","type":"header-three","key":"4aia8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":294,"offset":0,"style":"ITALIC"}],"text":"struct Person: Hashable {\n var name: String\n var age: Int\n \n func hash(into hasher: inout Hasher) {\n hasher.combine(name)\n hasher.combine(age)\n }\n \n static func == (lhs: Person, rhs: Person) -> Bool {\n lhs.name == rhs.name && lhs.age == rhs.age\n }\n}","type":"unstyled","key":"cu7of"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"10. Какие объекты могут быть ключом и значением в Dictionary?","type":"header-two","key":"ojf0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Ключ (Key):","type":"header-three","key":"98enc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":8,"offset":30,"style":"BOLD"}],"text":"Должен реализовывать протокол Hashable.","type":"unordered-list-item","key":"4pv09"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Все стандартные типы Swift, кроме функций и некоторых нестабильных типов: Int, String, Double, Bool, URL, IndexPath, Date, Character, UUID, Data, Range, Array (если элементы Hashable), Set (если элементы Hashable), Dictionary (если ключи и значения Hashable), Optional (если Wrapped Hashable).","type":"unordered-list-item","key":"2gi50"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Кастомные структуры и классы, если реализуют Hashable.","type":"unordered-list-item","key":"bf8qk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Значение (Value):","type":"header-three","key":"drt98"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":9,"offset":0,"style":"BOLD"}],"text":"Любой тип. Нет ограничений.","type":"unordered-list-item","key":"1rn3m"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Может быть классом, структурой, перечислением, замыканием, протоколом, Any, Optionalи т.д.","type":"unordered-list-item","key":"dk6po"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Важные нюансы:","type":"header-three","key":"886vh"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Если ключ — класс, то два разных объекта с одинаковыми полями считаются разными ключами (по умолчанию сравнение по указателю). Нужно переопределить == и hash(into:).","type":"unordered-list-item","key":"49s0k"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":44,"offset":35,"style":"BOLD"}],"text":"После добавления объекта в словарь нельзя изменять свойства, участвующие в хеше — иначе словарь не сможет его найти. Лучше использовать value types для ключей.","type":"unordered-list-item","key":"ae9mp"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример с кастомным ключом:","type":"header-three","key":"e7lbg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":109,"offset":0,"style":"ITALIC"}],"text":"struct UserID: Hashable {\n let value: Int\n}\nvar dict = [UserID: String]()\ndict[UserID(value: 1)] = \"Alice\"","type":"unstyled","key":"6g5d5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"11. Расскажи про Value и Reference type.","type":"header-two","key":"4hm23"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Value Types (типы-значения):","type":"header-three","key":"dkvc9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":7,"offset":0,"style":"BOLD"}],"text":"Примеры: struct, enum, tuple, Int, String, Array, Dictionary, Set, Optional","type":"unordered-list-item","key":"3vle2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":8,"offset":0,"style":"BOLD"}],"text":"Хранение: обычно на стеке (если не внутри reference type или не захвачены замыканием). Большие массивы/словари хранят данные в куче, но сам контейнер — value.","type":"unordered-list-item","key":"bh74"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":16,"offset":0,"style":"BOLD"},{"length":12,"offset":28,"style":"BOLD"}],"text":"При присваивании: создается полная копия (глубокая или поверхностная — зависит от содержимого, но формально — новый экземпляр).","type":"unordered-list-item","key":"dh223"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":3,"offset":0,"style":"BOLD"}],"text":"ARC: не участвуют (нет счетчика ссылок на сам value type, но если внутри есть ссылки, они управляются ARC).","type":"unordered-list-item","key":"5kq8c"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":0,"style":"BOLD"}],"text":"Изменяемость: для изменения нужен var. Константа (let) означает неизменяемость всего графа (но если внутри есть ссылки, они могут меняться, так как ссылка сама не меняется).","type":"unordered-list-item","key":"689su"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":18,"offset":0,"style":"BOLD"}],"text":"Потокобезопасность: по умолчанию безопаснее (каждый поток работает со своей копией).","type":"unordered-list-item","key":"esd7h"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":0,"style":"BOLD"}],"text":"Наследование: не поддерживают.","type":"unordered-list-item","key":"epb5k"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Reference Types (типы-ссылки):","type":"header-three","key":"1g3aj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":7,"offset":0,"style":"BOLD"}],"text":"Примеры: class, closure","type":"unordered-list-item","key":"3eas2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":8,"offset":0,"style":"BOLD"}],"text":"Хранение: в куче (heap). Стек хранит указатель.","type":"unordered-list-item","key":"de0rp"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":16,"offset":0,"style":"BOLD"},{"length":6,"offset":29,"style":"BOLD"}],"text":"При присваивании: копируется ссылка (указатель). Объект один.","type":"unordered-list-item","key":"bads2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":3,"offset":0,"style":"BOLD"}],"text":"ARC: управляются автоматическим подсчетом ссылок.","type":"unordered-list-item","key":"9qqh0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":0,"style":"BOLD"}],"text":"Изменяемость: можно менять свойства даже у let (сама ссылка константна, но объект может меняться).","type":"unordered-list-item","key":"d6770"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":18,"offset":0,"style":"BOLD"}],"text":"Потокобезопасность: нужно синхронизировать доступ (data races).","type":"unordered-list-item","key":"7c7l8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":0,"style":"BOLD"}],"text":"Наследование: поддерживают (одиночное).","type":"unordered-list-item","key":"12fr7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Выбор:","type":"header-three","key":"58ba5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Value types для данных, которые не должны разделяться (координаты, настройки, модели-фрагменты).","type":"unordered-list-item","key":"1bktc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Reference types для общих ресурсов, делегатов, идентичности (один объект должен быть виден везде).","type":"unordered-list-item","key":"46hhb"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример:\n","type":"header-three","key":"732ds"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":158,"offset":0,"style":"ITALIC"}],"text":"struct S { var x = 0 }\nclass C { var x = 0 }\n\nvar a = S(); var b = a\na.x = 5 // b.x == 0 (копия)\n\nvar c = C(); var d = c\nc.x = 5 // d.x == 5 (тот же объект)","type":"unstyled","key":"bncon"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"12. Расскажи подробнее про коллекции. Может ли в словаре поиск элемента быть O(n)?","type":"header-two","key":"1ssdj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Коллекции в Swift:","type":"header-three","key":"cgnnq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Array (ContiguousArray, ArraySlice)","type":"header-three","key":"1uo36"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":8,"offset":0,"style":"BOLD"}],"text":"Хранение: непрерывный блок памяти (copy-on-write).","type":"unordered-list-item","key":"6r726"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":17,"offset":0,"style":"BOLD"}],"text":"Доступ по индексу: O(1)","type":"unordered-list-item","key":"9gsno"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":24,"offset":0,"style":"BOLD"}],"text":"Вставка/удаление в конце: амортизированно O(1) (иногда реаллокация)","type":"unordered-list-item","key":"5ltvm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":27,"offset":0,"style":"BOLD"}],"text":"Вставка/удаление в середине: O(n) (сдвиг элементов)","type":"unordered-list-item","key":"65g61"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":27,"offset":0,"style":"BOLD"}],"text":"Поиск значения (firstIndex): O(n)","type":"unordered-list-item","key":"ahu5s"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":16,"offset":0,"style":"BOLD"}],"text":"Поиск по индексу: O(1)","type":"unordered-list-item","key":"1587q"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Dictionary","type":"header-three","key":"7fal6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":8,"offset":0,"style":"BOLD"}],"text":"Хранение: хеш-таблица с открытой адресацией (или гибридная). Swift использует NativeDictionary с кэшированием хешей.","type":"unordered-list-item","key":"3j7j4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":14,"offset":0,"style":"BOLD"},{"length":4,"offset":26,"style":"BOLD"},{"length":4,"offset":48,"style":"BOLD"}],"text":"Поиск по ключу: в среднем O(1). В худшем случае O(n).","type":"unordered-list-item","key":"dnkbb"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":16,"offset":0,"style":"BOLD"}],"text":"Вставка/удаление: аналогично поиску.","type":"unordered-list-item","key":"8apm6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Set","type":"header-three","key":"dk5l4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Аналогичен Dictionary, но только ключи.","type":"unordered-list-item","key":"ai3sk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Может ли поиск в словаре быть O(n)?","type":"header-three","key":"68miq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":2,"offset":0,"style":"BOLD"}],"text":"ДА, в следующих случаях:","type":"unstyled","key":"2in0o"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":22,"offset":0,"style":"BOLD"}],"text":"Сильные коллизии хешей.\nЕсли все ключи дают одинаковый хеш, они попадают в одну корзину.\nСловарь вынужден проверять каждый ключ на равенство (O(n)).\nПример: плохая хеш-функция, или злонамеренные данные.","type":"ordered-list-item","key":"4sn8i"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":29,"offset":0,"style":"BOLD"}],"text":"При рехешировании (rehashing).\nКогда словарь заполняется выше порога (обычно ~75%), он создает новый массив большего размера и перехеширует все элементы.\nВо время рехешинга операции могут быть медленнее, но это не O(n) для каждой операции, а амортизированная стоимость.","type":"ordered-list-item","key":"b7rrd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":37,"offset":0,"style":"BOLD"}],"text":"Если ключ — класс с неправильным hash.\nНапример, hash всегда возвращает 0.","type":"ordered-list-item","key":"eplk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Почему в среднем O(1)?","type":"header-three","key":"4trt2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Хорошая хеш-функция распределяет ключи равномерно.","type":"unordered-list-item","key":"5eud6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Размер корзин растет пропорционально количеству элементов.","type":"unordered-list-item","key":"cbujb"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вероятность коллизий низкая.","type":"unordered-list-item","key":"f77l0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример деградации:","type":"header-three","key":"7nt4m"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":251,"offset":1,"style":"ITALIC"}],"text":"\nstruct BadHash: Hashable {\n let value: Int\n func hash(into hasher: inout Hasher) {\n hasher.combine(0) // всегда 0\n }\n}\nvar dict = [BadHash: Int]()\nfor i in 0..<1000 {\n dict[BadHash(value: i)] = i // все в одной корзине, поиск O(n)\n}","type":"unstyled","key":"d08rj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"13. Как работает sort в Swift, за какую сложность?","type":"header-two","key":"a7cje"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":7,"offset":10,"style":"BOLD"}],"text":"Алгоритм: TimSort","type":"header-three","key":"3ff8e"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"TimSort — гибридный стабильный алгоритм сортировки, изобретенный Тимом Петерсом для Python. Swift использует его модификацию.","type":"unstyled","key":"75sjv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Принцип работы:","type":"header-three","key":"5v8la"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":18,"offset":0,"style":"BOLD"}],"text":"Разбиение на \"run\" (естественные или искусственные последовательности).\nИщет уже отсортированные подмассивы (возрастающие или убывающие).\nЕсли run слишком короткий (< 32 элементов), добивает до минимальной длины сортировкой вставками.","type":"ordered-list-item","key":"2mflg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":15,"offset":0,"style":"BOLD"}],"text":"Слияние (merge) run в стеке.\nПоддерживает инварианты размеров (как в merge sort).\nИспользует временный буфер для слияния.","type":"ordered-list-item","key":"260tg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Сложность:","type":"header-three","key":"34cao"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":13,"offset":0,"style":"BOLD"}],"text":"Худший случай: O(n log n)","type":"unordered-list-item","key":"9jtmn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":13,"offset":0,"style":"BOLD"}],"text":"Лучший случай (уже отсортирован): O(n)","type":"unordered-list-item","key":"c6b7q"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":14,"offset":0,"style":"BOLD"}],"text":"Средний случай: O(n log n)","type":"unordered-list-item","key":"1q945"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":6,"offset":0,"style":"BOLD"}],"text":"Память: O(n) в худшем случае (для временного буфера)","type":"unordered-list-item","key":"9go4j"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Стабильность:","type":"header-three","key":"9ev4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":10,"offset":0,"style":"BOLD"}],"text":"Стабильная — элементы с равными ключами сохраняют порядок.","type":"unordered-list-item","key":"d2rj5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Почему не quick sort?","type":"header-three","key":"d078e"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Quick sort нестабилен, худший случай O(n²) (если неудачный выбор опорного элемента).","type":"unordered-list-item","key":"fra9j"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"TimSort быстрее на реальных данных (частично отсортированных).","type":"unordered-list-item","key":"4e2ps"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Как использовать:\n","type":"header-three","key":"365aq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":166,"offset":0,"style":"ITALIC"}],"text":"var numbers = [3, 1, 4, 1, 5]\nnumbers.sort() // по возрастанию, мутирующий\nlet sorted = numbers.sorted() // возвращает новый массив\nnumbers.sort(by: >) // по убыванию","type":"unstyled","key":"d4cqp"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Для замыкания сравнения:","type":"header-three","key":"dnv65"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":36,"offset":1,"style":"ITALIC"}],"text":"\nnumbers.sort { $0.value < $1.value }","type":"unstyled","key":"blif7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"14. Что такое defer?","type":"header-two","key":"6jbnh"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":39,"offset":86,"style":"BOLD"}],"text":"defer — это механизм отложенного выполнения кода. Блок, помеченный defer, выполняется при выходе из текущей области видимости, независимо от того, как произошел выход (через return, throw, break, или просто достижение конца).","type":"unstyled","key":"7s20u"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Синтаксис:\n","type":"header-three","key":"5ri6s"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":51,"offset":0,"style":"ITALIC"}],"text":"defer {\n // код, который выполнится при выходе\n}","type":"unstyled","key":"98k3b"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Важные правила:","type":"header-three","key":"4sqjr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":15,"offset":0,"style":"BOLD"},{"length":16,"offset":30,"style":"BOLD"},{"length":62,"offset":67,"style":"ITALIC"}],"text":"Несколько defer выполняются в обратном порядке объявления (стек).\n\ndefer { print(\"1\") }\ndefer { print(\"2\") }\n// Вывод: 2, затем 1\n","type":"ordered-list-item","key":"3n103"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":17,"offset":0,"style":"BOLD"}],"text":"Область видимости — блок (функция, цикл, do-блок, if).","type":"ordered-list-item","key":"ehplu"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":16,"offset":0,"style":"BOLD"}],"text":"Переменные видны — defer видит все переменные на момент выхода, даже если они были изменены после объявления defer.","type":"ordered-list-item","key":"8ee14"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":32,"offset":0,"style":"BOLD"}],"text":"Нельзя break/return внутри defer (но можно в самом defer, это не запрещено, но странно).","type":"ordered-list-item","key":"77b7t"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":33,"offset":0,"style":"BOLD"}],"text":"Defer выполняется даже при ошибке (при throw).","type":"ordered-list-item","key":"3h1o7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример использования:\n","type":"header-three","key":"c4vk9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":223,"offset":0,"style":"ITALIC"}],"text":"func processFile(filename: String) throws {\n let file = openFile(filename)\n defer {\n closeFile(file) // закроем в любом случае\n }\n // ... работа с файлом, возможен throw\n // closeFile вызовется здесь\n}","type":"unstyled","key":"9l6fr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Где полезен:","type":"header-three","key":"2fjtk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Освобождение ресурсов (файлы, блокировки, сетевые соединения)","type":"unordered-list-item","key":"f1f5c"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Логирование времени выхода из функции","type":"unordered-list-item","key":"22com"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Сброс временного состояния","type":"unordered-list-item","key":"73eqe"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"performBatchUpdates в UIKit","type":"unordered-list-item","key":"2cq3i"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Нюанс с return:\n","type":"header-three","key":"au3up"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":129,"offset":0,"style":"ITALIC"}],"text":"func test() -> Int {\n defer { print(\"defer\") }\n return 10\n}\n// Сначала вычисляется return (10), затем defer, затем возврат.","type":"unstyled","key":"fsv5b"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"15. Расскажи про области видимости private, open и т.д.","type":"header-two","key":"7sqs4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":17,"offset":12,"style":"BOLD"}],"text":"Swift имеет 5 уровней доступа (от самого открытого к самому закрытому):","type":"unstyled","key":"ffs80"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"1. open","type":"header-three","key":"5gt8b"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":5,"offset":9,"style":"BOLD"}],"text":"Доступен везде (внутри модуля и вне его)","type":"unordered-list-item","key":"a0d1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":6,"style":"BOLD"},{"length":14,"offset":26,"style":"BOLD"},{"length":19,"offset":57,"style":"BOLD"}],"text":"Можно наследовать класс и переопределять методы/свойства за пределами модуля","type":"unordered-list-item","key":"4har2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Только для классов и их членов (не для структур, enum)","type":"unordered-list-item","key":"22niu"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"2. public","type":"header-three","key":"ufre"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":5,"offset":9,"style":"BOLD"}],"text":"Доступен везде (внутри и вне модуля)","type":"unordered-list-item","key":"f7nju"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":6,"offset":0,"style":"BOLD"},{"length":10,"offset":36,"style":"BOLD"}],"text":"Нельзя наследовать и переопределять вне модуля","type":"unordered-list-item","key":"16vqr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Можно использовать, но нельзя подменять поведение","type":"unordered-list-item","key":"cqlgj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"3. internal (по умолчанию)","type":"header-three","key":"974n9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":20,"offset":9,"style":"BOLD"}],"text":"Доступен только внутри модуля","type":"unordered-list-item","key":"20k50"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вне модуля — недоступен","type":"unordered-list-item","key":"4rhcu"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"4. fileprivate","type":"header-three","key":"31ohq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":23,"offset":9,"style":"BOLD"}],"text":"Доступен в пределах одного файла","type":"unordered-list-item","key":"5niqv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Любые типы в этом файле (не обязательно вложенные) имеют доступ","type":"unordered-list-item","key":"1h1lc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"5. private","type":"header-three","key":"2q0uo"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":37,"offset":9,"style":"BOLD"}],"text":"Доступен только в пределах лексической области (внутри того же типа/расширения, если расширение в том же файле)","type":"unordered-list-item","key":"120n6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"В Swift private распространяется на расширения того же типа в том же файле (в отличие от многих языков)","type":"unordered-list-item","key":"dfnu3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Особенности:","type":"header-three","key":"m589"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Расширения и private:\n","type":"header-three","key":"2e6hb"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":144,"offset":0,"style":"ITALIC"}],"text":"class MyClass {\n private var x = 0\n}\nextension MyClass {\n func foo() {\n print(x) // Доступно, если extension в том же файле\n }\n}","type":"unstyled","key":"8ma52"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Геттеры/сеттеры:\n","type":"header-three","key":"7g3o6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":76,"offset":0,"style":"ITALIC"}],"text":"public private(set) var name = \"Alice\" // публичный геттер, приватный сеттер","type":"unstyled","key":"3i91n"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"open vs public — пример:\n","type":"header-three","key":"9fqkv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":431,"offset":0,"style":"ITALIC"}],"text":"// Модуль A\nopen class ParentOpen {\n open func method() { }\n public func publicMethod() { }\n}\npublic class ParentPublic {\n public func method() { }\n}\n\n// Модуль B (импортирует A)\nclass ChildOpen: ParentOpen {\n override func method() { } // можно\n // override func publicMethod() { } // нельзя — не open\n}\nclass ChildPublic: ParentPublic {\n // override func method() { } // нельзя — класс public, но метод public\n}","type":"unstyled","key":"4lkb6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Доступ для протоколов:","type":"header-three","key":"6t185"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Протокол не может быть менее доступным, чем его требования.","type":"unordered-list-item","key":"8uom2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"16. Что такое typealias?","type":"header-two","key":"70mfq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":10,"offset":23,"style":"BOLD"}],"text":"typealias — объявление псевдонима для существующего типа. Не создает новый тип, а только альтернативное имя.","type":"unstyled","key":"9ka0i"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Синтаксис:\n","type":"header-three","key":"2ao0n"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":32,"offset":0,"style":"ITALIC"}],"text":"typealias NewName = ExistingType","type":"unstyled","key":"bco9d"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Примеры использования:","type":"header-three","key":"1740n"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":23,"offset":0,"style":"BOLD"}],"text":"Упрощение сложных типов:","type":"ordered-list-item","key":"7vgps"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":125,"offset":0,"style":"ITALIC"}],"text":"typealias JSON = [String: Any]\ntypealias CompletionHandler = (Result) -> Void\ntypealias Point = (x: Int, y: Int)","type":"unstyled","key":"2e8h4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":0,"style":"BOLD"}],"text":"2. Дженерики:","type":"unstyled","key":"fmafc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":85,"offset":0,"style":"ITALIC"}],"text":"typealias StringDictionary = Dictionary\ntypealias IntArray = Array","type":"unstyled","key":"bh9ij"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":0,"style":"BOLD"}],"text":"3. Замыкания:","type":"unstyled","key":"f3q5s"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":34,"offset":0,"style":"ITALIC"}],"text":"typealias VoidClosure = () -> Void","type":"unstyled","key":"9gj04"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":30,"offset":0,"style":"BOLD"}],"text":"4. Связанные типы в протоколах:","type":"unstyled","key":"8nvj9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":166,"offset":0,"style":"ITALIC"}],"text":"protocol StringRepresentable {\n associatedtype StringType\n}\nextension StringRepresentable where Self: CustomStringConvertible {\n typealias StringType = String\n}","type":"unstyled","key":"2r38q"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":30,"offset":0,"style":"BOLD"}],"text":"5. Совместимость с Objective-C:","type":"unstyled","key":"3qffl"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":54,"offset":0,"style":"ITALIC"}],"text":"typealias MyBlock = @convention(block) (Int) -> String","type":"unstyled","key":"6432i"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Ограничения:","type":"header-three","key":"5i1b9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Нельзя создать typealias для subscript или свойства.","type":"unordered-list-item","key":"fue9o"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Можно создавать вложенные:","type":"unordered-list-item","key":"aaffn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":65,"offset":0,"style":"ITALIC"}],"text":"struct Outer {\n typealias Inner = Int\n}\nlet x: Outer.Inner = 5","type":"unstyled","key":"av031"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Чем отличается от associatedtype?","type":"header-three","key":"3v291"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"typealias — это просто имя для конкретного типа.","type":"unordered-list-item","key":"a0vsm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"associatedtype — это дженерик-заполнитель в протоколе, который будет определен реализацией.","type":"unordered-list-item","key":"8aiia"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"17. Можем ли мы что-нибудь хранить в extension?","type":"header-two","key":"8kdmp"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":23,"offset":0,"style":"BOLD"}],"text":"Да, но с ограничениями.","type":"unstyled","key":"fvqkp"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Что можно добавлять в extension:\n","type":"header-three","key":"8og5f"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":44,"offset":0,"style":"BOLD"}],"text":"1.Вычисляемые свойства (computed properties):","type":"unstyled","key":"a3v6t"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":63,"offset":0,"style":"ITALIC"}],"text":"extension Int {\n var isEven: Bool { return self % 2 == 0 }\n}","type":"unstyled","key":"g4k3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":27,"offset":0,"style":"BOLD"}],"text":"2. Методы (instance и type):","type":"unstyled","key":"2elp9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":106,"offset":0,"style":"ITALIC"}],"text":"extension String {\n func reversed() -> String { ... }\n static func empty() -> String { return \"\" }\n}","type":"unstyled","key":"em1p"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":26,"offset":0,"style":"BOLD"}],"text":"3. Сабскрипты (subscripts):","type":"unstyled","key":"ft2h3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":129,"offset":0,"style":"ITALIC"}],"text":"extension Array {\n subscript(safe index: Int) -> Element? {\n return indices.contains(index) ? self[index] : nil\n }\n}","type":"unstyled","key":"av5jj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":17,"offset":0,"style":"BOLD"},{"length":129,"offset":342,"style":"ITALIC"}],"text":"4. Инициализаторы:\nДля структур и классов можно добавлять новые init, но:\nДля классов — только convenience init, если не использовать required.\nДля структур — любой init, но если у структуры есть автоматический memberwise init, то после добавления кастомного init в extension он сохраняется (в отличие от добавления внутри самой структуры).\n\nextension UIView {\n convenience init(color: UIColor) {\n self.init(frame: .zero)\n backgroundColor = color\n }\n}\n","type":"unstyled","key":"b2rbi"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":17,"offset":0,"style":"BOLD"}],"text":"5. Вложенные типы:","type":"unstyled","key":"f8vlh"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":209,"offset":0,"style":"ITALIC"}],"text":"extension Int {\n enum Kind { case negative, zero, positive }\n var kind: Kind {\n if self < 0 { return .negative }\n else if self > 0 { return .positive }\n else { return .zero }\n }\n}","type":"unstyled","key":"ai84n"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":27,"offset":0,"style":"BOLD"}],"text":"6. Conformance to protocols (основное применение extension):","type":"unstyled","key":"o7oa"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":38,"offset":0,"style":"ITALIC"}],"text":"extension MyType: SomeProtocol { ... }","type":"unstyled","key":"128h9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Чего нельзя добавлять:","type":"header-three","key":"5a0nf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":40,"offset":0,"style":"BOLD"}],"text":"1. Хранимые свойства (stored properties):","type":"unstyled","key":"c6mta"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":67,"offset":0,"style":"ITALIC"}],"text":"extension UIView {\n var myProperty: String = \"error\" // ОШИБКА\n}","type":"unstyled","key":"5squm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":62,"offset":0,"style":"ITALIC"}],"text":"Обход для классов через associated objects (но не чисто Swift):","type":"unstyled","key":"ca36p"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":244,"offset":0,"style":"ITALIC"}],"text":"private var key: Void?\nextension UIView {\n var myProperty: String {\n get { return objc_getAssociatedObject(self, &key) as? String ?? \"\" }\n set { objc_setAssociatedObject(self, &key, newValue, .OBJC_ASSOCIATION_RETAIN) }\n }\n}","type":"unstyled","key":"c2ai2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":39,"offset":0,"style":"BOLD"}],"text":"2. Переопределение существующих методов (можно только если метод из протокола, и то через ограничения).","type":"unstyled","key":"1tf8l"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":27,"offset":0,"style":"BOLD"}],"text":"3. Хранимые свойства класса (static let — можно, это тип, не экземпляр).","type":"unstyled","key":"4ehj1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":39,"offset":0,"style":"BOLD"}],"text":"4. Наблюдатели свойств (willSet/didSet) для существующих свойств — нельзя.","type":"unstyled","key":"6a8d"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Почему нельзя хранимые свойства?","type":"header-three","key":"e6gqf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Extension не может добавлять память к существующему типу. Структура объекта фиксирована в момент компиляции.","type":"unordered-list-item","key":"5hddp"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"18. Что такое static string?","type":"header-two","key":"deeru"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":29,"offset":29,"style":"BOLD"},{"length":40,"offset":63,"style":"BOLD"}],"text":"Скорее всего, имеется в виду static let строковое свойство или строковый литерал, хранящийся статически.","type":"unstyled","key":"9lusm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"static let string:","type":"header-three","key":"f5teo"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"struct Constants {\n static let appName = \"MyApp\"\n static let apiKey = \"123456\"\n}","type":"unstyled","key":"cpdi5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":23,"offset":13,"style":"BOLD"}],"text":"Существует в единственном экземпляре на весь тип.","type":"unordered-list-item","key":"13cfb"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":23,"offset":0,"style":"BOLD"}],"text":"Лениво инициализируется (при первом обращении), но static let — атомарно и потокобезопасно (Swift гарантирует).","type":"unordered-list-item","key":"7a5tu"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Не создает копий при каждом использовании.","type":"unordered-list-item","key":"9tp3c"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Статическая строка в C/Objective-C смысле:","type":"header-three","key":"2g37"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":15,"offset":95,"style":"BOLD"}],"text":"В Swift строки — value types (String). При объявлении let s = \"Hello\" строка может храниться в сегменте данных (как строковой литерал в бинарнике), а при использовании — копироваться (COW). Но Swift не делает различия между \"статической\" и \"динамической\" строкой на уровне синтаксиса.","type":"unstyled","key":"9r74s"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Нюансы:","type":"header-three","key":"646ju"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"static let в структуре — каждый тип имеет свою копию.","type":"unordered-list-item","key":"fq8k7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"static let в классе — аналогично, но классы могут быть переопределены, а статические свойства — нет.","type":"unordered-list-item","key":"7h2j4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"static var (не let) — изменяемое статическое свойство, но не потокобезопасно без синхронизации.","type":"unordered-list-item","key":"8lj4o"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример использования:`","type":"header-three","key":"6eq74"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"26qkm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":106,"offset":0,"style":"ITALIC"}],"text":"class User {\n static let defaultAvatar = \"avatar.png\"\n static var totalUsers = 0 // mutable static\n}","type":"unstyled","key":"4bugp"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"19. Что такое @autoclosure?","type":"header-two","key":"7uls6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":58,"offset":50,"style":"BOLD"}],"text":"@autoclosure — атрибут параметра функции, который автоматически оборачивает переданное выражение в замыкание. Позволяет писать вызывающий код без явных фигурных скобок {}.","type":"unstyled","key":"2itna"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Синтаксис:","type":"header-three","key":"df5ol"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":123,"offset":0,"style":"ITALIC"}],"text":"func assert(_ condition: @autoclosure () -> Bool, _ message: String) {\n if !condition() {\n print(message)\n }\n}","type":"unstyled","key":"b85pt"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вызов:\n","type":"header-three","key":"9j85q"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":36,"offset":0,"style":"ITALIC"}],"text":"assert(2 + 2 == 5, \"Math is broken\")\n// 2 + 2 == 5 автоматически превращается в { 2 + 2 == 5 }","type":"unstyled","key":"agvlc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Зачем нужно?","type":"header-three","key":"asej7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":18,"offset":0,"style":"BOLD"},{"length":6,"offset":43,"style":"BOLD"}],"text":"Ленивое вычисление — выражение вычисляется только при вызове замыкания.","type":"ordered-list-item","key":"9vvie"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":20,"offset":0,"style":"BOLD"}],"text":"Синтаксический сахар — не нужно писать { }.","type":"ordered-list-item","key":"861m4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":19,"offset":0,"style":"BOLD"}],"text":"Условное вычисление — например, в assert, precondition, где выражение может быть дорогим и вычисляется только при ошибке.","type":"ordered-list-item","key":"k1fa"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример с отложенным вычислением:\n","type":"header-three","key":"b5jmc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":217,"offset":0,"style":"ITALIC"}],"text":"func orElse(_ a: Bool, _ b: @autoclosure () -> Bool) -> Bool {\n if a { return true }\n return b() // вычисляется только если a == false\n}\n\norElse(true, expensiveComputation()) // expensiveComputation не вызовется","type":"unstyled","key":"6u72e"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Ограничения:","type":"header-three","key":"fa0b7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"@autoclosure можно применять только к параметрам замыканий без аргументов (() -> T).","type":"unordered-list-item","key":"b2unp"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"По умолчанию @autoclosure — не escaping. Если нужно сохранить замыкание, добавляют @autoclosure @escaping.","type":"unordered-list-item","key":"1738t"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Не злоупотреблять — ухудшает читаемость, если используется не по назначению.","type":"unordered-list-item","key":"bue6r"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример с escaping:","type":"header-three","key":"3dlc3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":119,"offset":0,"style":"ITALIC"}],"text":"var closures: [() -> Bool] = []\nfunc add(_ closure: @autoclosure @escaping () -> Bool) {\n closures.append(closure)\n}","type":"unstyled","key":"35rpv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"20. Что такое some, any?","type":"header-two","key":"b78r9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":32,"style":"BOLD"}],"text":"Это ключевые слова для работы с протоколами в Swift 5.1+ (some) и Swift 5.6+ (any).","type":"unstyled","key":"4pdb8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"some — Opaque Type (непрозрачный тип)","type":"header-three","key":"5ntv7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":19,"offset":29,"style":"BOLD"}],"text":"Говорит: \"Функция возвращает один конкретный тип, но я не хочу его называть\". Компилятор знает тип, но вызывающий код — нет.","type":"unstyled","key":"djusf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":108,"offset":0,"style":"ITALIC"}],"text":"func makeView() -> some UIView {\n return UIButton() // всегда UIButton, но наружу виден как some UIView\n}","type":"unstyled","key":"69bss"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":0,"style":"BOLD"}],"text":"Ограничения:","type":"unstyled","key":"28tm5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":17,"offset":18,"style":"BOLD"}],"text":"Должен возвращать один и тот же тип во всех ветках (нельзя return UIButton() и return UILabel()).","type":"unordered-list-item","key":"anh5h"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Сохраняет типобезопасность (в отличие от any).","type":"unordered-list-item","key":"b903s"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":0,"style":"BOLD"}],"text":"Где полезно:","type":"unstyled","key":"9q660"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Скрыть сложные дженерики (например, some Collection)","type":"unordered-list-item","key":"6otn1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Работа с протоколами, имеющими associatedtype или Self требования","type":"unordered-list-item","key":"ftftd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Возврат some View в SwiftUI","type":"unordered-list-item","key":"c2o0t"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"any — Existential Type (экзистенциальный тип)","type":"header-three","key":"2ard5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Говорит: \"Я стираю конкретный тип и работаю с ним через протокол динамически\".","type":"unstyled","key":"aifln"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":49,"offset":0,"style":"ITALIC"}],"text":"let views: [any UIView] = [UIButton(), UILabel()]","type":"unstyled","key":"esfvg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":0,"style":"BOLD"}],"text":"Особенности:","type":"unstyled","key":"5is0f"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":14,"style":"BOLD"}],"text":"Может хранить разные типы, соответствующие протоколу.","type":"unordered-list-item","key":"avnpd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":21,"offset":11,"style":"BOLD"}],"text":"Использует динамический dispatch (через witness table).","type":"unordered-list-item","key":"ich0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Имеет накладные расходы (упаковка в контейнер).","type":"unordered-list-item","key":"9ere8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Нельзя использовать с протоколами, имеющими Self или associatedtype (без type erasure).","type":"unordered-list-item","key":"afbi"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Сравнение:","type":"header-three","key":"6pdeq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":3,"offset":1,"style":"BOLD"},{"length":12,"offset":89,"style":"BOLD"},{"length":17,"offset":187,"style":"BOLD"},{"length":23,"offset":265,"style":"BOLD"},{"length":19,"offset":344,"style":"BOLD"},{"length":19,"offset":404,"style":"BOLD"},{"length":13,"offset":5,"style":"ITALIC"},{"length":12,"offset":39,"style":"ITALIC"},{"length":13,"offset":102,"style":"ITALIC"},{"length":12,"offset":151,"style":"ITALIC"},{"length":13,"offset":205,"style":"ITALIC"},{"length":12,"offset":223,"style":"ITALIC"},{"length":13,"offset":289,"style":"ITALIC"},{"length":12,"offset":306,"style":"ITALIC"},{"length":13,"offset":364,"style":"ITALIC"},{"length":12,"offset":385,"style":"ITALIC"},{"length":13,"offset":424,"style":"ITALIC"},{"length":12,"offset":445,"style":"ITALIC"}],"text":"\nТип\nsome Protocol Один конкретный тип\nany Protocol Любой тип, соответствующий протоколу\nДинамичность\nsome Protocol Статический (известен компилятору)\nany Protocol Динамический (unknown)\nНакладные расходы\nsome Protocol Нет\nany Protocol Есть (existential container)\nРабота с associatedtype\nsome Protocol Да\nany Protocol Нет (нужен type erasure)\nРазные ветки return\nsome Protocol Нельзя\nany Protocol Можно\nМассив разных типов\nsome Protocol Нельзя\nany Protocol Можно","type":"unstyled","key":"6vdss"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Когда что использовать:","type":"header-three","key":"aojli"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"some — для возврата однотипных объектов, сохраняя абстракцию.","type":"unordered-list-item","key":"b0a3t"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"any — для коллекций с разными типами, для стирания типов.","type":"unordered-list-item","key":"99c3m"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример:\n","type":"header-three","key":"7pq63"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":118,"offset":0,"style":"ITALIC"}],"text":"protocol P { associatedtype T }\nfunc f() -> some P { ... } // OK\n// func g() -> any P { ... } // ERROR: associatedtype","type":"unstyled","key":"uonm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"21. Что такое copy-on-write?","type":"header-two","key":"5vb8l"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":19,"offset":0,"style":"BOLD"},{"length":25,"offset":102,"style":"BOLD"}],"text":"Copy-on-Write (COW) — оптимизация для value types, при которой реальное копирование данных происходит только в момент изменения одной из копий, а не в момент присваивания.","type":"unstyled","key":"2aks8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Как работает в Swift:","type":"header-three","key":"96k3e"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":0,"style":"BOLD"},{"length":11,"offset":88,"style":"BOLD"}],"text":"Присваивание (var a = b):\nСоздается новая структура-обертка, но внутренний буфер данных разделяется (через ссылку на выделенную в куче память).\nСчетчик ссылок на буфер увеличивается.","type":"ordered-list-item","key":"9b0h4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":9,"offset":0,"style":"BOLD"},{"length":11,"offset":206,"style":"BOLD"}],"text":"Изменение (a.append(5)):\nПроверяется isUniquelyReferenced() (или _isUnique).\nЕсли на буфер есть только одна ссылка (текущая) — можно менять на месте.\nЕсли несколько (например, b тоже ссылается) — создается новая копия буфера, затем изменение.","type":"ordered-list-item","key":"fblb2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Где используется в стандартной библиотеке:","type":"header-three","key":"66tr1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Array","type":"unordered-list-item","key":"77lva"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Dictionary","type":"unordered-list-item","key":"cnfj0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Set","type":"unordered-list-item","key":"bhijf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"String","type":"unordered-list-item","key":"4hi5f"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример:\n","type":"header-three","key":"5spea"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":134,"offset":0,"style":"ITALIC"}],"text":"var a = [1, 2, 3]\nvar b = a // копирования нет, общий буфер\nb.append(4) // здесь происходит реальное копирование (COW)\n// теперь a = [1,2,3], b = [1,2,3,4]","type":"unstyled","key":"87glv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Как реализовать свой COW:\n","type":"header-three","key":"39g2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":83,"offset":0,"style":"ITALIC"},{"length":340,"offset":85,"style":"ITALIC"}],"text":"final class Ref {\n var value: T\n init(_ value: T) { self.value = value }\n}\n\nstruct COW {\n private var ref: Ref\n \n init(_ value: T) {\n ref = Ref(value)\n }\n \n var value: T {\n get { ref.value }\n set {\n if !isKnownUniquelyReferenced(&ref) {\n ref = Ref(newValue)\n return\n }\n ref.value = newValue\n }\n }\n}","type":"unstyled","key":"da6ha"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Преимущества:","type":"header-three","key":"3ri25"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Экономит память и время для больших value types.","type":"unordered-list-item","key":"5pbnk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Позволяет value types эффективно работать с большими данными.","type":"unordered-list-item","key":"9i9ul"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Недостатки:","type":"header-three","key":"dorbl"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Накладные расходы на проверку уникальности.","type":"unordered-list-item","key":"f9lja"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Нужно осторожно с многопоточностью (проверка не атомарна без дополнительной синхронизации).","type":"unordered-list-item","key":"8gpoo"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"22. Что такое type erasure?","type":"header-two","key":"3uhm8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":0,"style":"BOLD"}],"text":"Type Erasure — паттерн, который скрывает конкретный тип (особенно с associatedtype или Self требованиями) за общей оберткой, позволяя работать с разными типами через единый интерфейс.","type":"unstyled","key":"5qo1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Зачем нужен?","type":"header-three","key":"57i50"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Протокол с associatedtype нельзя использовать как any Protocol:","type":"unstyled","key":"1itd6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":110,"offset":0,"style":"ITALIC"}],"text":"protocol Container {\n associatedtype Item\n func get() -> Item\n}\n// let c: any Container = ... // Ошибка!","type":"unstyled","key":"9ac72"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Решение — Type Erasure:","type":"header-three","key":"7ki36"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Классическая реализация:","type":"header-three","key":"83n0q"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"1gsbn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":227,"offset":0,"style":"ITALIC"}],"text":"struct AnyContainer: Container {\n private let _get: () -> Item\n \n init(_ container: C) where C.Item == Item {\n _get = { container.get() }\n }\n \n func get() -> Item { return _get() }\n}","type":"unstyled","key":"3sqft"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Примеры в Swift:","type":"header-three","key":"2bo4l"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"AnySequence, AnyCollection, AnyIterator","type":"unordered-list-item","key":"8v21f"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"AnyPublisher (Combine)","type":"unordered-list-item","key":"33fes"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"AnyCancellable","type":"unordered-list-item","key":"cgvvf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"AnyHashable","type":"unordered-list-item","key":"efi6g"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Как работает AnyHashable:","type":"header-three","key":"7qjo6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":46,"offset":0,"style":"ITALIC"}],"text":"let set: Set = [1, \"hello\", 3.14]","type":"unstyled","key":"859dl"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"AnyHashable хранит внутри исходное значение и замыкания для == и hash.","type":"unstyled","key":"360nv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Реализация простого type erasure:","type":"header-three","key":"53fk6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":299,"offset":0,"style":"ITALIC"}],"text":"protocol Drawable {\n func draw()\n}\n\nstruct AnyDrawable: Drawable {\n private let _draw: () -> Void\n \n init(_ drawable: T) {\n _draw = { drawable.draw() }\n }\n \n func draw() { _draw() }\n}\n\nlet items: [AnyDrawable] = [AnyDrawable(Circle()), AnyDrawable(Square())]","type":"unstyled","key":"5ggh6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Альтернативы:","type":"header-three","key":"fp7aq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":4,"offset":0,"style":"BOLD"}],"text":"some — если нужен один конкретный тип.","type":"unordered-list-item","key":"7rgko"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":3,"offset":0,"style":"BOLD"}],"text":"any — если протокол не имеет associated types.","type":"unordered-list-item","key":"8vig9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":0,"style":"BOLD"}],"text":"Type erasure — когда нужно хранить коллекцию разных типов с associated types.","type":"unordered-list-item","key":"bgdhg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Недостатки type erasure:","type":"header-three","key":"15i7h"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Увеличение кода (ручная обертка).","type":"unordered-list-item","key":"3ru8k"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Потеря некоторых типовых ограничений.","type":"unordered-list-item","key":"cglm5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Накладные расходы на вызовы через замыкания.","type":"unordered-list-item","key":"4vvud"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"23. Какие проблемы с многопоточностью? Какие способы работы с многопоточностью есть из коробки?","type":"header-two","key":"234kt"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Проблемы многопоточности:","type":"header-three","key":"d07fg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":25,"offset":0,"style":"BOLD"}],"text":"Data Race (гонка данных)\nДва потока одновременно читают/пишут одну память, хотя бы одна операция — запись.\nПриводит к неопределенному поведению, падениям, повреждению данных.","type":"ordered-list-item","key":"aljbp"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":31,"offset":0,"style":"BOLD"}],"text":"Deadlock (взаимная блокировка)\nПоток A ждет ресурс, занятый B, а B ждет ресурс, занятый A.\nПриложение зависает навсегда.","type":"ordered-list-item","key":"fsgl1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":9,"offset":0,"style":"BOLD"}],"text":"Livelock\nПотоки не заблокированы, но постоянно меняют состояние, не достигая прогресса.","type":"ordered-list-item","key":"8vukn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":19,"offset":0,"style":"BOLD"}],"text":"Priority Inversion\nНизкоприоритетный поток захватил ресурс, нужный высокоприоритетному. Высокий ждет, а средний — не дает низкому выполняться.","type":"ordered-list-item","key":"648pc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":15,"offset":0,"style":"BOLD"}],"text":"Race condition\nРезультат зависит от непредсказуемого порядка выполнения потоков.","type":"ordered-list-item","key":"cnj9v"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":17,"offset":0,"style":"BOLD"}],"text":"Memory corruption (из-за data race на ссылках).","type":"ordered-list-item","key":"burcq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":16,"offset":0,"style":"BOLD"}],"text":"Thread explosion — создание слишком многих потоков (дорого).","type":"ordered-list-item","key":"bdlqr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Способы работы с многопоточностью из коробки в Swift/iOS:","type":"header-three","key":"dp9pd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Низкоуровневые:","type":"header-three","key":"1utrk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Thread — прямое создание потоков (не рекомендуется).","type":"unordered-list-item","key":"2k19k"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"POSIX threads (pthread) — через C interop.","type":"unordered-list-item","key":"3akqc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"GCD (Grand Central Dispatch) — DispatchQueue:","type":"header-three","key":"24oti"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Серийные и конкурентные очереди.","type":"unordered-list-item","key":"1tsnj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"sync / async.","type":"unordered-list-item","key":"78pq1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"DispatchGroup, DispatchSemaphore, DispatchWorkItem, DispatchBarrier.","type":"unordered-list-item","key":"7f21a"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"DispatchSource (мониторинг файлов, таймеров).","type":"unordered-list-item","key":"2fkuf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"OperationQueue (более высокий уровень):","type":"header-three","key":"fibmp"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Operation и BlockOperation.","type":"unordered-list-item","key":"1nqh5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Зависимости между операциями.","type":"unordered-list-item","key":"b5hk1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Максимальное количество одновременных операций.","type":"unordered-list-item","key":"a0hhi"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Отмена, приоритеты, KVO.","type":"unordered-list-item","key":"268dg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"NSLock и производные:","type":"header-three","key":"7oq22"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"NSLock, NSRecursiveLock, NSCondition, NSConditionLock.","type":"unordered-list-item","key":"41io9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"os_unfair_lock (быстрее, но низкоуровнево).","type":"unordered-list-item","key":"f7fos"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"@synchronized (только Obj-C).","type":"unordered-list-item","key":"2m2gh"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Swift Concurrency (async/await, с iOS 15 / macOS 12):","type":"header-three","key":"3dhgs"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"async / await.","type":"unordered-list-item","key":"9fvaj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Task, TaskGroup.","type":"unordered-list-item","key":"bfsn5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Actor — для защиты состояния.","type":"unordered-list-item","key":"c83on"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"@MainActor — для UI.","type":"unordered-list-item","key":"db21m"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"@Sendable — для передачи замыканий между потоками.","type":"unordered-list-item","key":"57rl2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"AsyncStream, AsyncSequence.","type":"unordered-list-item","key":"7f3p"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Другие:","type":"header-three","key":"el4ua"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"RunLoop — для событийного цикла (в основном на главном потоке).","type":"unordered-list-item","key":"78e1p"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Timer (с run loop).","type":"unordered-list-item","key":"fik96"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"DispatchIO, DispatchData.","type":"unordered-list-item","key":"65no1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Рекомендации:","type":"header-three","key":"rib5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Для UI — @MainActor или DispatchQueue.main.","type":"unordered-list-item","key":"9c7vg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Для защиты данных — actor (новый Swift) или серийная очередь.","type":"unordered-list-item","key":"19kam"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Для сложных зависимостей — OperationQueue.","type":"unordered-list-item","key":"88ths"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Для простых асинхронных задач — Task / async.","type":"unordered-list-item","key":"6h307"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"24. В чем отличие deadlock и livelock?","type":"header-two","key":"5nejl"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Deadlock (мертвая блокировка)","type":"header-three","key":"dhp4l"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":0,"style":"BOLD"}],"text":"Определение: Ситуация, когда два или более потоков (процессов) блокируют друг друга, каждый ожидает освобождения ресурса, занятого другим, и ни один не может продолжить выполнение.","type":"unstyled","key":"d48a7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":31,"offset":0,"style":"BOLD"}],"text":"Условия возникновения (Coffman): все 4 должны выполняться:","type":"unstyled","key":"1dt9i"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Взаимное исключение (ресурс занят только одним)","type":"ordered-list-item","key":"ab35a"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Удержание и ожидание (поток держит ресурс и ждет другой)","type":"ordered-list-item","key":"cua3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Нет вытеснения (ресурс нельзя отнять)","type":"ordered-list-item","key":"3dtkq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Циклическое ожидание (цикл в графе зависимостей)","type":"ordered-list-item","key":"bdt82"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":6,"offset":0,"style":"BOLD"}],"text":"Пример:","type":"unstyled","key":"7mfko"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":41,"offset":0,"style":"ITALIC"},{"length":68,"offset":43,"style":"ITALIC"},{"length":68,"offset":113,"style":"ITALIC"}],"text":"let lockA = NSLock()\nlet lockB = NSLock()\n\n// Поток 1\nlockA.lock()\nlockB.lock() // ждет lockB, но он у Потока 2\n\n// Поток 2\nlockB.lock()\nlockA.lock() // ждет lockA, но он у Потока 1","type":"unstyled","key":"7pln0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":8,"offset":0,"style":"BOLD"}],"text":"Симптомы: Приложение полностью зависает. Потоки не потребляют CPU (ждут).","type":"unstyled","key":"n6g7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Livelock (оживленная блокировка)","type":"header-three","key":"6k8mr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":0,"style":"BOLD"},{"length":20,"offset":86,"style":"BOLD"}],"text":"Определение: Потоки не заблокированы, они активно выполняют действия, но эти действия не ведут к прогрессу — состояние постоянно меняется, но работа не выполняется.","type":"unstyled","key":"cdbvi"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":6,"offset":0,"style":"BOLD"}],"text":"Пример:","type":"unstyled","key":"fjos9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Два человека встречаются в коридоре, оба уступают дорогу в одну сторону, потом оба снова шагают, снова уступают — бесконечно.","type":"unordered-list-item","key":"8k7m8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"В коде: два потока пытаются захватить два ресурса, видят конфликт, освобождают всё, ждут случайное время и повторяют.","type":"unordered-list-item","key":"cls9f"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":8,"offset":0,"style":"BOLD"}],"text":"Симптомы: Потоки активно используют CPU (100%), но результат не достигается.","type":"unstyled","key":"1j4ad"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Сравнение:","type":"header-three","key":"fmjig"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":17,"offset":1,"style":"BOLD"},{"length":17,"offset":81,"style":"BOLD"},{"length":23,"offset":140,"style":"BOLD"},{"length":11,"offset":219,"style":"BOLD"},{"length":9,"offset":19,"style":"ITALIC"},{"length":8,"offset":49,"style":"ITALIC"},{"length":9,"offset":99,"style":"ITALIC"},{"length":8,"offset":123,"style":"ITALIC"},{"length":9,"offset":164,"style":"ITALIC"},{"length":8,"offset":177,"style":"ITALIC"},{"length":9,"offset":231,"style":"ITALIC"},{"length":8,"offset":258,"style":"ITALIC"}],"text":"\nСостояние потоков\nDeadlock Заблокированы (ждут)\nLivelock Активны, выполняют код\nИспользование CPU\nDeadlock Низкое (или 0)\nLivelock Высокое\nВыход без вмешательства\nDeadlock Нет\nLivelock Иногда (если случайные задержки)\nДиагностика\nDeadlock Легко (зависание)\nLivelock Трудно (кажется, что работает)","type":"unstyled","key":"f1gsf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Как избежать:","type":"header-three","key":"e3s5h"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Deadlock: всегда захватывать блокировки в одинаковом порядке, использовать таймауты, избегать вложенных блокировок.","type":"unordered-list-item","key":"1u64s"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Livelock: добавлять случайные задержки, экспоненциальную задержку, или детерминированный арбитр.","type":"unordered-list-item","key":"4h63v"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"25. Как соотносятся поток и очередь?","type":"header-two","key":"f48g1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Поток (Thread)","type":"header-three","key":"33f04"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Единица выполнения, планируемая операционной системой.","type":"unordered-list-item","key":"bmrmf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Имеет свой стек, регистры, состояние (running, waiting, etc.).","type":"unordered-list-item","key":"fpe3b"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Может быть вытеснен в любой момент.","type":"unordered-list-item","key":"4r81b"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"В одном процессе может быть много потоков.","type":"unordered-list-item","key":"aocs4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Создание потока — дорогая операция (~мегабайт стека + накладные расходы).","type":"unordered-list-item","key":"5bjoj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Очередь (DispatchQueue)","type":"header-three","key":"o9bg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Абстракция уровня GCD (Grand Central Dispatch).","type":"unordered-list-item","key":"e7fh5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Не является потоком.","type":"unordered-list-item","key":"2998v"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Позволяет отправлять блоки кода (замыкания) для выполнения.","type":"unordered-list-item","key":"8vhiq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":8,"offset":11,"style":"BOLD"}],"text":"Может быть серийной (serial) — один поток обслуживает очередь.","type":"unordered-list-item","key":"et7ug"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":4,"style":"BOLD"}],"text":"Или конкурентной (concurrent) — несколько потоков из пула GCD.","type":"unordered-list-item","key":"s4uc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Соотношение:","type":"header-three","key":"89oq5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":21,"offset":0,"style":"BOLD"},{"length":10,"offset":24,"style":"BOLD"}],"text":"Одна серийная очередь → один поток (но не обязательно тот же самый всегда — GCD может переключать очередь на другой поток после блокировки, но в момент выполнения — один поток).","type":"unordered-list-item","key":"aqoak"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":25,"offset":0,"style":"BOLD"},{"length":13,"offset":28,"style":"BOLD"}],"text":"Одна конкурентная очередь → много потоков (из пула GCD, обычно 64 максимум).","type":"unordered-list-item","key":"a04bm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":10,"offset":0,"style":"BOLD"},{"length":21,"offset":29,"style":"BOLD"}],"text":"Один поток может обслуживать много разных очередей (например, main thread обслуживает main queue и любые очереди, отправленные на main поток через async).","type":"unordered-list-item","key":"af913"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":36,"offset":0,"style":"BOLD"}],"text":"Очередь не привязана жестко к потоку — GCD может мигрировать блок между потоками (но не во время выполнения блока).","type":"unordered-list-item","key":"b7166"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример:","type":"header-three","key":"d6uns"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":203,"offset":0,"style":"ITALIC"}],"text":"let serialQueue = DispatchQueue(label: \"my.serial\")\nserialQueue.async {\n // этот блок может выполняться на потоке #3\n}\nserialQueue.async {\n // а этот — на потоке #3 или другом, но последовательно\n}","type":"unstyled","key":"66hsn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Главный поток и main queue:","type":"header-three","key":"scnq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":15,"offset":38,"style":"BOLD"}],"text":"DispatchQueue.main жестко привязана к главному потоку.","type":"unordered-list-item","key":"1ls42"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Это исключение.","type":"unordered-list-item","key":"dveno"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Зачем нужны очереди, если есть потоки?","type":"header-three","key":"cnc5p"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Управление потоками вручную сложно и опасно.","type":"unordered-list-item","key":"dorfu"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"GCD предоставляет высокоуровневые примитивы (синхронизация, барьеры, группы).","type":"unordered-list-item","key":"bdhb0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пулы потоков переиспользуются, экономя ресурсы.","type":"unordered-list-item","key":"74e9s"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"26. Всегда ли на main thread задачи с main queue и всегда ли задачи с main queue попадают на main thread?","type":"header-two","key":"aocvr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":10,"offset":7,"style":"BOLD"}],"text":"Ответ: ДА, всегда.","type":"header-three","key":"c203r"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":16,"offset":65,"style":"BOLD"}],"text":"DispatchQueue.main — это специальная глобальная очередь, которая жестко привязана к главному потоку (main thread) приложения.","type":"unstyled","key":"65da4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Любой блок, отправленный на main.async или main.sync, будет выполнен на главном потоке.","type":"unordered-list-item","key":"27g4g"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Если вы находитесь на главном потоке, то текущая очередь — это main (если вы не синхронно вызвали другую очередь, но тогда выполнение временно переключается, но исходный контекст остается main).","type":"unordered-list-item","key":"2cvt"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Почему так?","type":"header-three","key":"9j5jh"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"UI-фреймворк (UIKit, SwiftUI) требует, чтобы все операции с UI выполнялись на главном потоке.","type":"unordered-list-item","key":"9nihi"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"main queue спроектирована как серийная очередь, работающая на главном потоке.","type":"unordered-list-item","key":"e1k1k"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Проверка:\n","type":"header-three","key":"5k1j7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":67,"offset":0,"style":"ITALIC"}],"text":"DispatchQueue.main.async {\n print(Thread.isMainThread) // true\n}","type":"unstyled","key":"8lkdb"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Исключения (нет, это миф):","type":"header-three","key":"f5bj0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Некоторые думают, что sync на main из main может переключить — но это deadlock, а не другой поток. Нет механизма, чтобы main queue использовала другой поток.","type":"unstyled","key":"88lij"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Итог:","type":"header-three","key":"f5cjh"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Задачи из main queue → main thread","type":"unordered-list-item","key":"415b4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"На main thread → задачи из main queue (или синхронно вызванные из других очередей, но тогда текущий контекст — main thread, но не main queue формально)","type":"unordered-list-item","key":"38anm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"27. Что будет, если на DispatchQueue.main вызвать DispatchQueue.main.sync?","type":"header-two","key":"ddk7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":30,"offset":0,"style":"BOLD"}],"text":"Deadlock (взаимная блокировка). Приложение зависнет навсегда.","type":"unstyled","key":"6vjhv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Почему?","type":"header-three","key":"7da1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вы находитесь на главном потоке (main thread).","type":"ordered-list-item","key":"84fcq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"sync означает: заблокируй текущий поток и не возвращай управление, пока переданный блок не выполнится.","type":"ordered-list-item","key":"5smjm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Блок должен выполниться на DispatchQueue.main.","type":"ordered-list-item","key":"c0q0r"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Но главный поток уже занят ожиданием (он не может выполнить блок, так как он сам же и ждет).","type":"ordered-list-item","key":"60e3h"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Получается цикл: поток ждет себя же.","type":"ordered-list-item","key":"ap8qr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Код, который убьет приложение:\n","type":"header-three","key":"42nis"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":55,"offset":0,"style":"ITALIC"}],"text":"DispatchQueue.main.sync {\n print(\"Never executed\")\n}","type":"unstyled","key":"2krt7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Что будет на практике:","type":"header-three","key":"auiv8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Приложение перестает реагировать на касания.","type":"unordered-list-item","key":"qmeg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"UI не обновляется.","type":"unordered-list-item","key":"d2cgt"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Через некоторое время watchdog (системный) убьет приложение (crash).","type":"unordered-list-item","key":"1iucl"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Исключения (не deadlock):","type":"header-three","key":"ao4hj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":10,"offset":26,"style":"BOLD"}],"text":"Если вызвать sync на main не из main (например, из фоновой очереди), то все работает:\n","type":"unordered-list-item","key":"6qrgh"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":139,"offset":0,"style":"ITALIC"}],"text":"DispatchQueue.global().async {\n DispatchQueue.main.sync {\n print(\"OK\") // Блок выполнится на main, фоновый поток подождет\n }\n}","type":"unstyled","key":"adnqh"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Как избежать:","type":"header-three","key":"6cihd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Никогда не вызывайте .sync на той же очереди, на которой вы находитесь.","type":"unordered-list-item","key":"cpgur"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Для main queue — используйте только .async, если вы уже на main.","type":"unordered-list-item","key":"7t8cd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Если нужно гарантировать выполнение на main из любого места: DispatchQueue.main.async(не блокирует).","type":"unordered-list-item","key":"fvebu"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"28. В чем отличия добавления на очередь sync и async?","type":"header-two","key":"f9uss"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"sync (синхронное выполнение)","type":"header-three","key":"baavv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":23,"offset":0,"style":"BOLD"}],"text":"Блокирует текущий поток до завершения блока.","type":"unordered-list-item","key":"77lqr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":22,"style":"BOLD"}],"text":"Возвращает управление только после выполнения блока.","type":"unordered-list-item","key":"9qf5t"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Может использоваться для получения результата из блока.","type":"unordered-list-item","key":"33l3q"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":13,"offset":0,"style":"BOLD"}],"text":"Риск deadlock, если вызвать на текущей очереди.","type":"unordered-list-item","key":"su03"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Не создает дополнительных накладных расходов на планирование (блок выполняется сразу, если возможно).","type":"unordered-list-item","key":"4gtha"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"async (асинхронное выполнение)","type":"header-three","key":"bjbjr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":0,"style":"BOLD"}],"text":"Не блокирует текущий поток.","type":"unordered-list-item","key":"8k2p6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":10,"offset":22,"style":"BOLD"}],"text":"Возвращает управление немедленно.","type":"unordered-list-item","key":"6hi3v"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Блок выполнится позже (когда очередь дойдет до него).","type":"unordered-list-item","key":"b7g7i"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Безопасен — никогда не приведет к deadlock на той же очереди.","type":"unordered-list-item","key":"el92h"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Позволяет очереди самой решать, когда и на каком потоке выполнять блок.","type":"unordered-list-item","key":"5gs13"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Сравнительная таблица:","type":"header-three","key":"8vgvj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"772k7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":26,"offset":0,"style":"BOLD"},{"length":18,"offset":45,"style":"BOLD"},{"length":26,"offset":93,"style":"BOLD"},{"length":33,"offset":138,"style":"BOLD"},{"length":13,"offset":234,"style":"BOLD"},{"length":4,"offset":27,"style":"ITALIC"},{"length":5,"offset":35,"style":"ITALIC"},{"length":4,"offset":64,"style":"ITALIC"},{"length":5,"offset":81,"style":"ITALIC"},{"length":4,"offset":120,"style":"ITALIC"},{"length":5,"offset":128,"style":"ITALIC"},{"length":4,"offset":171,"style":"ITALIC"},{"length":5,"offset":197,"style":"ITALIC"},{"length":4,"offset":248,"style":"ITALIC"},{"length":5,"offset":292,"style":"ITALIC"}],"text":"Блокировка текущего потока\nsync Да\nasync Нет\nВозврат управления\nsync После блока\nasync Сразу\nDeadlock на той же очереди\nsync Да\nasync 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async).","type":"unordered-list-item","key":"2h6nt"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Когда использовать async:","type":"header-three","key":"hg20"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"UI-обновления (всегда async с main).","type":"unordered-list-item","key":"fk789"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Длительные операции (чтобы не блокировать UI).","type":"unordered-list-item","key":"8gs1i"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Загрузка данных из сети.","type":"unordered-list-item","key":"2d4lf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Когда порядок выполнения не критичен или управляется очередью.","type":"unordered-list-item","key":"cco6m"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"29. Mutex и семафор: в чем отличия?","type":"header-two","key":"8gl77"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Mutex (Mutual Exclusion)","type":"header-three","key":"8g0t7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":8,"offset":0,"style":"BOLD"}],"text":"Бинарный (значения 0 или 1).","type":"unordered-list-item","key":"9kp6o"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":16,"offset":11,"style":"BOLD"}],"text":"Привязан к потоку-владельцу — только тот поток, который захватил mutex, может его освободить.","type":"unordered-list-item","key":"1cm97"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Поддерживает рекурсивный захват (если NSRecursiveLock).","type":"unordered-list-item","key":"dtl06"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Операции: lock() / unlock().","type":"unordered-list-item","key":"487h7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Блокирует поток, если mutex уже занят (ждет).","type":"unordered-list-item","key":"7fqch"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Семафор (Semaphore)","type":"header-three","key":"bsdds"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":7,"offset":0,"style":"BOLD"}],"text":"Счетчик (любое неотрицательное целое число).","type":"unordered-list-item","key":"3vnr0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Не привязан к потоку — любой поток может выполнить signal().","type":"unordered-list-item","key":"3v55p"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Операции: wait() (уменьшает счетчик, блокирует если 0) и signal() (увеличивает).","type":"unordered-list-item","key":"9js0a"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Может использоваться как бинарный (счетчик 1).","type":"unordered-list-item","key":"9ius9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Позволяет ограничивать доступ к ресурсу N потокам одновременно.","type":"unordered-list-item","key":"1p44n"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Сравнение:","type":"header-three","key":"fnluf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":3,"offset":1,"style":"BOLD"},{"length":8,"offset":43,"style":"BOLD"},{"length":13,"offset":83,"style":"BOLD"},{"length":12,"offset":174,"style":"BOLD"},{"length":18,"offset":233,"style":"BOLD"},{"length":10,"offset":313,"style":"BOLD"},{"length":5,"offset":5,"style":"ITALIC"},{"length":8,"offset":20,"style":"ITALIC"},{"length":5,"offset":52,"style":"ITALIC"},{"length":8,"offset":71,"style":"ITALIC"},{"length":5,"offset":97,"style":"ITALIC"},{"length":8,"offset":130,"style":"ITALIC"},{"length":5,"offset":187,"style":"ITALIC"},{"length":8,"offset":211,"style":"ITALIC"},{"length":5,"offset":252,"style":"ITALIC"},{"length":8,"offset":273,"style":"ITALIC"},{"length":5,"offset":324,"style":"ITALIC"},{"length":8,"offset":356,"style":"ITALIC"}],"text":"\nТип\nMutex Бинарный\nСемафор Счетчик (0..N)\nВладелец\nMutex Есть (поток)\nСемафор Нет\nРекурсивность\nMutex Может быть (RecursiveLock)\nСемафор Нет (всегда рекурсивный по природе)\nОсвобождение\nMutex Только владельцем\nСемафор Любым потоком\nПроизводительность\nMutex Обычно быстрее\nСемафор Чуть медленнее (из-за счетчика)\nПрименение\nMutex Защита критической секции\nСемафор Ограничение числа одновременных доступов (пул соединений)","type":"unstyled","key":"9gh7k"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Примеры в Swift:","type":"header-three","key":"n9qn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":14,"offset":0,"style":"BOLD"}],"text":"Mutex (NSLock):","type":"unstyled","key":"emts1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":67,"offset":0,"style":"ITALIC"}],"text":"let lock = NSLock()\nlock.lock()\n// критическая секция\nlock.unlock()","type":"unstyled","key":"f1qbm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":27,"offset":0,"style":"BOLD"}],"text":"Семафор (DispatchSemaphore):","type":"unstyled","key":"8rp6t"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":127,"offset":0,"style":"ITALIC"}],"text":"let semaphore = DispatchSemaphore(value: 2) // 2 потока одновременно\nsemaphore.wait()\n// ограниченный доступ\nsemaphore.signal()","type":"unstyled","key":"8c1k5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Бинарный семафор vs Mutex:","type":"header-three","key":"6fpgs"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Бинарный семафор (value = 1) может использоваться как mutex, но:\nЛюбой поток может сделать signal (даже не владелец) — это может сломать логику.\nMutex проверяет владельца и предотвращает ошибочное освобождение.","type":"unordered-list-item","key":"ece3c"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Рекурсивный mutex:\n","type":"header-three","key":"fpo7e"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":167,"offset":0,"style":"ITALIC"}],"text":"let lock = NSRecursiveLock()\nfunc recursive(_ n: Int) {\n lock.lock()\n if n > 0 { recursive(n-1) }\n lock.unlock()\n}\n// Обычный NSLock завис бы на втором lock()","type":"unstyled","key":"7dr8t"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Когда что использовать:","type":"header-three","key":"5h0on"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Mutex — для защиты коротких критических секций.","type":"unordered-list-item","key":"bodg4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Семафор — для ограничения количества одновременных операций (например, 10 загрузок одновременно).","type":"unordered-list-item","key":"6bs2p"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"RecursiveLock — для рекурсивных функций (но лучше избегать).","type":"unordered-list-item","key":"dsvht"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"30. Что такое атомарные операции?","type":"header-two","key":"bvlr6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":18,"offset":0,"style":"BOLD"},{"length":8,"offset":93,"style":"BOLD"}],"text":"Атомарные операции — это операции чтения, записи или модификации памяти, которые выполняются неделимо с точки зрения других потоков. Ни один другой поток не может увидеть промежуточное состояние.","type":"unstyled","key":"5b8d3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Свойства:","type":"header-three","key":"99eov"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":0,"style":"BOLD"}],"text":"Неделимость — операция либо выполнилась полностью, либо не началась.","type":"unordered-list-item","key":"di3gk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":14,"offset":0,"style":"BOLD"}],"text":"Без блокировок — не использует mutex (но может использовать аппаратные гарантии).","type":"unordered-list-item","key":"8sdo4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":33,"offset":0,"style":"BOLD"}],"text":"Обычно одна инструкция процессора (или несколько, но с гарантией).","type":"unordered-list-item","key":"9gli6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Примеры атомарных операций:","type":"header-three","key":"ce6u5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"atomic load — чтение значения","type":"unordered-list-item","key":"cqk79"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"atomic store — запись значения","type":"unordered-list-item","key":"ep375"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"fetch_add — прочитать, прибавить, записать (все атомарно)","type":"unordered-list-item","key":"4ff3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"compare-and-swap (CAS) — если значение равно ожидаемому, заменить на новое","type":"unordered-list-item","key":"759fo"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"В Swift:","type":"header-three","key":"9g7ur"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":16,"offset":23,"style":"BOLD"}],"text":"Стандартная библиотека не предоставляет атомарные типы напрямую. Но есть:","type":"unstyled","key":"8u662"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":16,"offset":0,"style":"BOLD"}],"text":"1. Swift Atomics (от Apple) — пакет swift-atomics:","type":"unstyled","key":"dbsai"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":96,"offset":0,"style":"ITALIC"}],"text":"import Atomics\nvar counter = ManagedAtomic(0)\ncounter.wrappingIncrement(ordering: .relaxed)","type":"unstyled","key":"ehna4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":0,"style":"BOLD"}],"text":"2. OSAtomic (устарело, но работает для совместимости):","type":"unstyled","key":"c03pv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":62,"offset":0,"style":"ITALIC"}],"text":"import Darwin\nvar value: Int32 = 0\nOSAtomicIncrement32(&value)","type":"unstyled","key":"3pejg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":20,"offset":0,"style":"BOLD"}],"text":"3. Через C++ interop:","type":"unstyled","key":"8lad3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":29,"offset":0,"style":"ITALIC"}],"text":"cpp\nstd::atomic counter;","type":"unstyled","key":"dt7qg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример проблемы без атомарности:\n","type":"header-three","key":"1msen"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":123,"offset":0,"style":"ITALIC"}],"text":"var counter = 0\n// Поток 1: counter += 1 (read, add, write)\n// Поток 2: counter += 1\n// Может стать 1 вместо 2 из-за гонки","type":"unstyled","key":"74hit"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Решение с атомарностью:\n","type":"header-three","key":"ebc8d"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":88,"offset":0,"style":"ITALIC"}],"text":"let counter = ManagedAtomic(0)\ncounter.wrappingIncrement(ordering: .relaxed) // атомарно","type":"unstyled","key":"3tjo2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Ordering (модель памяти):","type":"header-three","key":"7mkbj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"relaxed — только атомарность, без барьеров","type":"unordered-list-item","key":"5d1tl"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"acquire — последующие операции не переупорядочиваются до этой","type":"unordered-list-item","key":"1imsv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"release — предыдущие операции не переупорядочиваются после этой","type":"unordered-list-item","key":"9bdof"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"sequentiallyConsistent — полная упорядоченность","type":"unordered-list-item","key":"dpjht"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Применение:","type":"header-three","key":"crbrr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Счетчики","type":"unordered-list-item","key":"a6t8p"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Флаги состояния","type":"unordered-list-item","key":"2v8fm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Lock-free структуры данных","type":"unordered-list-item","key":"c8t4u"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Реализация once инициализации","type":"unordered-list-item","key":"3qqri"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Альтернативы (не атомарные, но проще):","type":"header-three","key":"annri"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"NSLock — но с блокировками (дороже).","type":"unordered-list-item","key":"11k2u"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"DispatchQueue — но с контекстом переключения.","type":"unordered-list-item","key":"2pnvf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"31. В чем отличия параллелизма и конкуренции?","type":"header-two","key":"2n1r3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Эти термины часто путают. Их различие важно для понимания многопоточного программирования.","type":"unstyled","key":"c1mfa"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Конкурентность (Concurrency)","type":"header-three","key":"5cp7h"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":10,"offset":0,"style":"BOLD"}],"text":"Логическая одновременность.","type":"unordered-list-item","key":"5sihs"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":5,"offset":16,"style":"BOLD"}],"text":"Несколько задач могут выполняться одновременно, но физически могут и не выполняться.","type":"unordered-list-item","key":"c5tvv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":19,"offset":4,"style":"BOLD"}],"text":"Это структура программы — способ организации кода.","type":"unordered-list-item","key":"1psr1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Задачи могут чередоваться на одном ядре.","type":"unordered-list-item","key":"aj513"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример: async/await, GCD с одним ядром.","type":"unordered-list-item","key":"ae4u5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Параллелизм (Parallelism)","type":"header-three","key":"fi6gd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":10,"offset":0,"style":"BOLD"}],"text":"Физическая одновременность.","type":"unordered-list-item","key":"21scg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":13,"offset":16,"style":"BOLD"}],"text":"Несколько задач действительно выполняются в один момент времени.","type":"unordered-list-item","key":"fi35t"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":19,"offset":4,"style":"BOLD"}],"text":"Это свойство выполнения — зависит от количества ядер.","type":"unordered-list-item","key":"3jt1a"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Требует аппаратной поддержки (многоядерный процессор).","type":"unordered-list-item","key":"35jba"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример: вычисления на всех ядрах CPU.","type":"unordered-list-item","key":"jm1e"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Ключевое различие (по Робу Пайку):","type":"header-three","key":"albrv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":108,"offset":0,"style":"BOLD"}],"text":"Concurrency is about dealing with lots of things at once. Parallelism is about doing lots of things at once.","type":"blockquote","key":"ba2ph"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Иллюстрация:","type":"header-three","key":"do61u"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":33,"offset":0,"style":"BOLD"}],"text":"Конкурентность, но не параллелизм:","type":"unstyled","key":"77lft"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Одно ядро CPU.","type":"unordered-list-item","key":"ealrs"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Два потока переключаются через таймер.","type":"unordered-list-item","key":"a87n"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Кажется, что они работают одновременно, но физически — последовательно.","type":"unordered-list-item","key":"494nf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":0,"style":"BOLD"}],"text":"Параллелизм:","type":"unstyled","key":"6a7lg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Два ядра CPU.","type":"unordered-list-item","key":"95v5a"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Два потока работают строго одновременно.","type":"unordered-list-item","key":"2i1cv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":28,"offset":0,"style":"BOLD"}],"text":"Конкурентность + параллелизм:","type":"unstyled","key":"325cd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Четыре ядра, 10 потоков — некоторые выполняются параллельно, некоторые ждут.","type":"unordered-list-item","key":"3aqnd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Примеры кода:","type":"header-three","key":"5jpdm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":14,"offset":0,"style":"BOLD"}],"text":"Конкурентность:","type":"unstyled","key":"1qqjl"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":126,"offset":0,"style":"ITALIC"}],"text":"Task {\n let data = await fetchData() // не блокирует поток, но может выполняться на том же ядре\n await updateUI(data)\n}","type":"unstyled","key":"ccuud"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":0,"style":"BOLD"}],"text":"Параллелизм:","type":"unstyled","key":"fe9cl"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":121,"offset":0,"style":"ITALIC"}],"text":"DispatchQueue.concurrentPerform(iterations: 100) { i in\n heavyCompute(i) // выполняется на разных ядрах параллельно\n}","type":"unstyled","key":"2cl80"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Почему это важно?","type":"header-three","key":"1n1te"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":6,"offset":21,"style":"BOLD"}],"text":"Конкурентность — это дизайн (как разбить задачу на независимые части).","type":"unordered-list-item","key":"dpec"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":13,"offset":18,"style":"BOLD"}],"text":"Параллелизм — это эффективность (как быстрее выполнить).","type":"unordered-list-item","key":"boon7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Ошибка:","type":"header-three","key":"4qc5d"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"\"Мой код конкурентный, значит он параллельный\" — нет. Для параллелизма нужно:","type":"unstyled","key":"7r2nm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Несколько ядер","type":"ordered-list-item","key":"ch34t"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Задачи, которые действительно могут выполняться одновременно (нет глобальной блокировки)","type":"ordered-list-item","key":"ddiaj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Планировщик, который их распределит","type":"ordered-list-item","key":"3h1h4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"32. DispatchGroup — что такое?","type":"header-two","key":"e2j4j"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"DispatchGroup — механизм GCD для отслеживания завершения группы асинхронных задач. Позволяет дождаться выполнения нескольких блоков, отправленных на разные очереди.","type":"unstyled","key":"70n1f"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Основные методы:","type":"header-three","key":"9u1qd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":7,"offset":0,"style":"BOLD"}],"text":"enter() — увеличивает счетчик задач в группе (на 1).","type":"ordered-list-item","key":"8dhid"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":7,"offset":0,"style":"BOLD"}],"text":"leave() — уменьшает счетчик. Когда счетчик становится 0 — группа завершена.","type":"ordered-list-item","key":"dilav"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":18,"offset":0,"style":"BOLD"}],"text":"notify(q:execute:) — выполняет блок, когда счетчик станет 0.","type":"ordered-list-item","key":"cuasa"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":6,"offset":0,"style":"BOLD"}],"text":"wait() — синхронно блокирует текущий поток до завершения группы.","type":"ordered-list-item","key":"56efk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Простой пример:","type":"header-three","key":"6n5k7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"bnd10"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":387,"offset":0,"style":"ITALIC"}],"text":"let group = DispatchGroup()\nlet queue = DispatchQueue.global()\n\ngroup.enter()\nqueue.async {\n Thread.sleep(forTimeInterval: 1)\n print(\"Task 1 done\")\n group.leave()\n}\n\ngroup.enter()\nqueue.async {\n Thread.sleep(forTimeInterval: 2)\n print(\"Task 2 done\")\n group.leave()\n}\n\ngroup.notify(queue: .main) {\n print(\"All tasks done\")\n}\n// Вывод: через 2 секунды \"All tasks done\"","type":"unstyled","key":"690de"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Ручной enter/leave для асинхронных функций:","type":"header-three","key":"6dq1g"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"7c6gm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":291,"offset":0,"style":"ITALIC"}],"text":"func fetchData(completion: @escaping () -> Void) {\n DispatchQueue.global().asyncAfter(deadline: .now() + 1) {\n completion()\n }\n}\n\nlet group = DispatchGroup()\ngroup.enter()\nfetchData {\n print(\"Data loaded\")\n group.leave()\n}\ngroup.notify(queue: .main) {\n print(\"Ready\")\n}","type":"unstyled","key":"62chu"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Синхронное ожидание (осторожно!):","type":"header-three","key":"65n4p"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"d485j"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":70,"offset":0,"style":"ITALIC"}],"text":"group.wait() // блокирует текущий поток\n// Не вызывать на main queue!","type":"unstyled","key":"e5hi0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Использование с async (более удобно):\n","type":"header-three","key":"d7g22"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":78,"offset":0,"style":"ITALIC"}],"text":"queue.async(group: group) {\n // задача автоматически вызывает enter/leave\n}","type":"unstyled","key":"a0lgt"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример загрузки нескольких изображений:","type":"header-three","key":"8jb5a"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"7ffp9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":365,"offset":0,"style":"ITALIC"}],"text":"let group = DispatchGroup()\nvar images: [UIImage] = []\n\nfor url in urls {\n group.enter()\n URLSession.shared.dataTask(with: url) { data, _, _ in\n if let data = data, let image = UIImage(data: data) {\n images.append(image)\n }\n group.leave()\n }.resume()\n}\n\ngroup.notify(queue: .main) {\n self.imageView.image = images.first\n}","type":"unstyled","key":"38fc0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Важно:","type":"header-three","key":"fq0sf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Каждый enter() должен быть сбалансирован leave().","type":"unordered-list-item","key":"7dq0t"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вызов leave() больше раз, чем enter(), вызовет crash.","type":"unordered-list-item","key":"94i1o"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"notify можно добавить несколько раз.","type":"unordered-list-item","key":"a7urv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"wait() с таймаутом: wait(timeout: .now() + 5).","type":"unordered-list-item","key":"2nlts"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"33. Что такое ThreadPool, как живет поток, как поддерживается его жизнь в системе? Кто управляет жизненным циклом потока?","type":"header-two","key":"1aei0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"ThreadPool (пул потоков)","type":"header-three","key":"59rf5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":16,"offset":6,"style":"BOLD"}],"text":"Набор переиспользуемых потоков.","type":"unordered-list-item","key":"gguj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Задачи не создают новые потоки, а берут готовые из пула.","type":"unordered-list-item","key":"cl88n"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Уменьшает накладные расходы на создание/уничтожение потоков.","type":"unordered-list-item","key":"48j9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Как живет поток (жизненный цикл):","type":"header-three","key":"17a1e"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":8,"offset":0,"style":"BOLD"}],"text":"Создание:\nОС выделяет память под стек (обычно 512 КБ — 1 МБ).\nСоздается контекст потока (регистры, приоритет, группа).\nВызывается функция-раннер (thread entry point).","type":"ordered-list-item","key":"8cq2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":16,"offset":0,"style":"BOLD"}],"text":"Ожидание (sleep):\nПоток не выполняет код, не потребляет CPU.\nМожет быть разбужен по таймеру, событию, или при поступлении задачи.","type":"ordered-list-item","key":"3dd5t"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":20,"offset":0,"style":"BOLD"}],"text":"Выполнение (running):\nПоток активен на ядре CPU.\nВыполняет задачи из очереди пула.","type":"ordered-list-item","key":"a1jij"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":20,"offset":0,"style":"BOLD"}],"text":"Блокировка (waiting):\nПоток ждет ресурс (mutex, I/O, сеть).\nОС переключает на другой поток.","type":"ordered-list-item","key":"9mo95"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":10,"offset":0,"style":"BOLD"}],"text":"Завершение:\nПоток завершает раннер-функцию.\nОС освобождает стек и ресурсы.","type":"ordered-list-item","key":"87lbk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Кто управляет жизненным циклом?","type":"header-three","key":"8pif5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":0,"style":"BOLD"}],"text":"На уровне ОС: ядро (kernel) — планировщик потоков (scheduler). Оно решает, какой поток на каком ядре и как долго будет выполняться (вытесняющая многозадачность).","type":"unstyled","key":"37rno"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":20,"offset":0,"style":"BOLD"}],"text":"На уровне приложения:","type":"unstyled","key":"32g0q"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":28,"offset":0,"style":"BOLD"}],"text":"GCD (Grand Central Dispatch) — управляет пулом потоков для своих очередей. Создает потоки при необходимости, уничтожает после простоя.","type":"unordered-list-item","key":"c4q98"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":14,"offset":0,"style":"BOLD"}],"text":"OperationQueue — использует GCD или свой пул.","type":"unordered-list-item","key":"4i61o"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":0,"style":"BOLD"}],"text":"Thread class — при создании Thread вы сами управляете запуском, но ОС управляет планированием.","type":"unordered-list-item","key":"4qj3n"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пул потоков в GCD:","type":"header-three","key":"8q3u9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"GCD имеет глобальный пул потоков (обычно до 64).","type":"unordered-list-item","key":"e8pfp"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Потоки создаются лениво, по мере необходимости.","type":"unordered-list-item","key":"7otkc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"После выполнения задачи поток не уничтожается, а переходит в сон (усыпляется) на несколько секунд. Если за это время приходит новая задача — просыпается.","type":"unordered-list-item","key":"6402i"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Если поток долго не используется — ОС может его прибить, GCD создаст новый.","type":"unordered-list-item","key":"bom7a"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Код для наблюдения:","type":"header-three","key":"5crpj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"e6m24"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":102,"offset":0,"style":"ITALIC"}],"text":"let queue = DispatchQueue.global()\nqueue.async {\n print(Thread.current) // какой-то поток из пула\n}","type":"unstyled","key":"c4e20"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Параметры пула:","type":"header-three","key":"179li"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Минимальное/максимальное количество потоков.","type":"unordered-list-item","key":"288r0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Время простоя перед уничтожением.","type":"unordered-list-item","key":"6vuim"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Приоритеты потоков (quality of service).","type":"unordered-list-item","key":"7bi9h"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Управление вручную (редко):","type":"header-three","key":"7u55i"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"9gdkb"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":68,"offset":0,"style":"ITALIC"}],"text":"let thread = Thread {\n // работа\n}\nthread.start()\nthread.cancel()","type":"unstyled","key":"8osa5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Но лучше использовать GCD или OperationQueue.","type":"unstyled","key":"n918"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"34. Как реализовать потокобезопасный массив несколькими способами?","type":"header-two","key":"6ukqk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Потокобезопасный массив — доступ (чтение/запись) из нескольких потоков не вызывает data race.","type":"unstyled","key":"ebv17"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Способ 1: Серийная очередь","type":"header-three","key":"1us0d"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"6hd2h"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":420,"offset":0,"style":"ITALIC"}],"text":"class SafeArray {\n private var array = [T]()\n private let queue = DispatchQueue(label: \"safe.array\")\n \n func append(_ element: T) {\n queue.async(flags: .barrier) {\n self.array.append(element)\n }\n }\n \n func get(at index: Int) -> T? {\n queue.sync {\n guard index < self.array.count else { return nil }\n return self.array[index]\n }\n }\n}","type":"unstyled","key":"feo6h"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Способ 2: Конкурентная очередь + барьеры (оптимально)","type":"header-three","key":"b7rdr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"cp8g6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":455,"offset":0,"style":"ITALIC"}],"text":"class SafeArrayConcurrent {\n private var array = [T]()\n private let queue = DispatchQueue(label: \"safe.array\", attributes: .concurrent)\n \n func append(_ element: T) {\n queue.async(flags: .barrier) {\n self.array.append(element)\n }\n }\n \n func get(at index: Int) -> T? {\n queue.sync {\n guard index < self.array.count else { return nil }\n return self.array[index]\n }\n }\n}","type":"unstyled","key":"ieci"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Способ 3: NSLock","type":"header-three","key":"1eafv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"d8vvo"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":384,"offset":0,"style":"ITALIC"}],"text":"class SafeArrayLock {\n private var array = [T]()\n private let lock = NSLock()\n \n func append(_ element: T) {\n lock.lock()\n array.append(element)\n lock.unlock()\n }\n \n func get(at index: Int) -> T? {\n lock.lock()\n defer { lock.unlock() }\n guard index < array.count else { return nil }\n return array[index]\n }\n}","type":"unstyled","key":"7i717"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Способ 4: os_unfair_lock (быстрее)","type":"header-three","key":"bqehg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"bdlhl"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":465,"offset":0,"style":"ITALIC"}],"text":"import os\n\nclass SafeArrayUnfair {\n private var array = [T]()\n private var lock = os_unfair_lock()\n \n func append(_ element: T) {\n os_unfair_lock_lock(&lock)\n array.append(element)\n os_unfair_lock_unlock(&lock)\n }\n \n func get(at index: Int) -> T? {\n os_unfair_lock_lock(&lock)\n defer { os_unfair_lock_unlock(&lock) }\n guard index < array.count else { return nil }\n return array[index]\n }\n}","type":"unstyled","key":"7fhq3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Способ 5: Actor (Swift 5.5+, лучший)","type":"header-three","key":"f4856"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"2u62b"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":380,"offset":0,"style":"ITALIC"}],"text":"actor SafeArrayActor {\n private var array = [T]()\n \n func append(_ element: T) {\n array.append(element)\n }\n \n func get(at index: Int) -> T? {\n guard index < array.count else { return nil }\n return array[index]\n }\n}\n// Использование:\nlet safeArray = SafeArrayActor()\nawait safeArray.append(5)\nlet value = await safeArray.get(at: 0)","type":"unstyled","key":"2uktj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Способ 6: Семафор","type":"header-three","key":"cju46"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"dasv9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":242,"offset":0,"style":"ITALIC"}],"text":"class SafeArraySemaphore {\n private var array = [T]()\n private let semaphore = DispatchSemaphore(value: 1)\n \n func append(_ element: T) {\n semaphore.wait()\n array.append(element)\n semaphore.signal()\n }\n}","type":"unstyled","key":"ckp0i"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Сравнение производительности (от быстрого к медленному):","type":"header-three","key":"3ig0s"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"actor (современный, безопасный)","type":"ordered-list-item","key":"8vpak"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"os_unfair_lock","type":"ordered-list-item","key":"dhkv0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"NSLock","type":"ordered-list-item","key":"937l3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Конкурентная очередь с барьерами","type":"ordered-list-item","key":"1t7tl"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Серийная очередь","type":"ordered-list-item","key":"7nvip"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Семафор","type":"ordered-list-item","key":"1u6b1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Рекомендация:","type":"header-three","key":"1t5tm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"В новом коде — actor.","type":"unordered-list-item","key":"ckv8r"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"В legacy коде — конкурентная очередь с барьерами (читается параллельно, пишет эксклюзивно).","type":"unordered-list-item","key":"9160k"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"35. Можно ли работать с UI с background потока?","type":"header-two","key":"8o2hj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":44,"offset":0,"style":"BOLD"}],"text":"Технически — можно, но категорически нельзя. Это приведет к неопределенному поведению, крешам, артефактам.","type":"unstyled","key":"35l93"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Почему нельзя?","type":"header-three","key":"bhsr8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":18,"offset":6,"style":"BOLD"}],"text":"UIKit не потокобезопасен.","type":"unordered-list-item","key":"5ul06"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Многие операции с UI обращаются к общим структурам (CALayer, event loop, display link).","type":"unordered-list-item","key":"c0had"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Background поток может изменить состояние вью в момент, когда main поток его читает.","type":"unordered-list-item","key":"brltj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Что произойдет?","type":"header-three","key":"efbni"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":15,"offset":0,"style":"BOLD"}],"text":"Случайные креши (EXC_BAD_ACCESS, assertion failures).","type":"unordered-list-item","key":"cckf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":24,"offset":0,"style":"BOLD"}],"text":"Неправильное отображение (мерцание, артефакты).","type":"unordered-list-item","key":"2tr2k"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":16,"offset":0,"style":"BOLD"}],"text":"Необновленный UI (изменения не видны).","type":"unordered-list-item","key":"3jbnl"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":9,"offset":0,"style":"BOLD"}],"text":"Зависания (deadlock с main потоком).","type":"unordered-list-item","key":"3316n"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Исключения (очень редкие, но безопасные):","type":"header-three","key":"81vjr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Создание UIImage из данных (без отображения).","type":"unordered-list-item","key":"9jroc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Предварительный расчет текста (NSAttributedString bounding rect).","type":"unordered-list-item","key":"40ou1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Подготовка изображений (масштабирование, обрезка) — но только если результат потом передается на main.","type":"unordered-list-item","key":"99lh6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"UIGraphicsImageRenderer — но сам рендеринг лучше на main или специальном контексте.","type":"unordered-list-item","key":"2eoeq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Проверка:","type":"header-three","key":"67o4k"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"2076i"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":117,"offset":0,"style":"ITALIC"}],"text":"assert(Thread.isMainThread, \"UI update on background thread\")\n// или\ndispatchPrecondition(condition: .onQueue(.main))","type":"unstyled","key":"d7g99"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Как правильно:","type":"header-three","key":"97vnn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"3p6vk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":149,"offset":0,"style":"ITALIC"}],"text":"DispatchQueue.global().async {\n let data = heavyNetworkCall()\n DispatchQueue.main.async {\n self.label.text = data // UI на main\n }\n}","type":"unstyled","key":"72suf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Современный Swift (Swift Concurrency):","type":"header-three","key":"2dqtc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"","type":"unstyled","key":"cdu3e"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":172,"offset":0,"style":"ITALIC"}],"text":"Task {\n let data = await fetchData() // background\n await MainActor.run {\n self.label.text = data // main\n }\n}\n// или\n@MainActor\nfunc updateUI() { ... }","type":"unstyled","key":"6p2fj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":3,"offset":6,"style":"BOLD"}],"text":"Итог: НЕТ. Все UI-операции — только на главном потоке.","type":"header-three","key":"af94e"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"36. Всегда ли bounds.origin равен нулю и когда он не равен нулю?","type":"header-two","key":"3nd8q"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":9,"offset":0,"style":"BOLD"}],"text":"Не всегда. bounds.origin может быть ненулевым.","type":"unstyled","key":"224b2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"По умолчанию:","type":"header-three","key":"3634a"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"У свежесозданного UIView bounds.origin = (0, 0).","type":"unordered-list-item","key":"6dn36"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Когда становится ненулевым:","type":"header-three","key":"d34tk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":19,"offset":0,"style":"BOLD"}],"text":"1. Ручное изменение:","type":"unstyled","key":"2u1kb"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":44,"offset":0,"style":"ITALIC"}],"text":"view.bounds.origin = CGPoint(x: 100, y: 200)","type":"unstyled","key":"vj4n"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":15,"offset":0,"style":"BOLD"}],"text":"2. UIScrollView (самый частый случай):\nПри скролле contentOffset изменяет bounds.origin.\nscrollView.bounds.origin отражает смещение содержимого.","type":"unstyled","key":"2c2ch"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":77,"offset":0,"style":"ITALIC"}],"text":"scrollView.contentOffset = CGPoint(x: 50, y: 0) // bounds.origin станет (50,0)","type":"unstyled","key":"9c4dv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":19,"offset":0,"style":"BOLD"}],"text":"После трансформаций:\nПри повороте/масштабировании frame меняется, но bounds.origin обычно остается нулевым, если не менять вручную.","type":"ordered-list-item","key":"2j03k"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":13,"offset":0,"style":"BOLD"}],"text":"При анимациях (временные изменения).","type":"ordered-list-item","key":"plce"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":15,"offset":0,"style":"BOLD"}],"text":"Внутри draw(_:):\nbounds.origin может указывать на область перерисовки.","type":"ordered-list-item","key":"9g4vn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Важно:","type":"header-three","key":"ds6m3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":11,"style":"BOLD"}],"text":"bounds — в собственной системе координат вью.","type":"unordered-list-item","key":"dorb5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"bounds.origin влияет на расположение сабвью.","type":"unordered-list-item","key":"13esq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Если изменить bounds.origin, все сабвью сдвинутся (как камера).","type":"unordered-list-item","key":"2nnfk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример:\n","type":"header-three","key":"bjktd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":193,"offset":0,"style":"ITALIC"}],"text":"let view = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))\nview.bounds.origin = CGPoint(x: 10, y: 20)\n// Сабвью, добавленные с frame (0,0), отрисуются в (-10, -20) относительно view.","type":"unstyled","key":"33amd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Итог:","type":"header-three","key":"3hooc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Не всегда.","type":"unordered-list-item","key":"e9i0q"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Ненулевой: при скролле, ручном изменении, некоторых анимациях.","type":"unordered-list-item","key":"6g1jk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"37. В чем отличие frame и bounds?","type":"header-two","key":"6b5ms"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":24,"offset":17,"style":"BOLD"},{"length":17,"offset":44,"style":"BOLD"},{"length":14,"offset":114,"style":"BOLD"},{"length":13,"offset":214,"style":"BOLD"},{"length":5,"offset":62,"style":"ITALIC"},{"length":6,"offset":89,"style":"ITALIC"},{"length":5,"offset":129,"style":"ITALIC"},{"length":6,"offset":165,"style":"ITALIC"},{"length":5,"offset":228,"style":"ITALIC"},{"length":6,"offset":264,"style":"ITALIC"}],"text":"Оба — CGRect, но разные системы координат.\n\nСистема координат\nframe Родителя (superview)\nbounds Своя (внутренняя)\nЧто определяет\nframe Положение и размер в родителе\nbounds Размер вью и внутренняя система координат\nПри изменении\nframe Меняет положение и размер вью\nbounds Меняет отображение сабвью","type":"unstyled","key":"5e90f"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Подробно:","type":"header-three","key":"7km2p"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"frame:","type":"header-three","key":"dtpf6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":8,"offset":13,"style":"BOLD"}],"text":"Относительно супервью (или окна, если нет родителя).","type":"unordered-list-item","key":"bnh51"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Используется Auto Layout, layoutSubviews, hitTest.","type":"unordered-list-item","key":"a9os"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Включает в себя трансформации (поворот, масштабирование).","type":"unordered-list-item","key":"13fgk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"bounds:","type":"header-three","key":"4h2hf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":9,"style":"BOLD"}],"text":"Всегда в собственных координатах.","type":"unordered-list-item","key":"2atvj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"bounds.size обычно совпадает с frame.size (если нет трансформаций).","type":"unordered-list-item","key":"66ags"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"bounds.origin обычно (0,0), если не сдвигать.","type":"unordered-list-item","key":"904os"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Определяет внутреннюю систему для рисования и сабвью.","type":"unordered-list-item","key":"3uflv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример:\n","type":"header-three","key":"nbkv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":272,"offset":0,"style":"ITALIC"}],"text":"let parent = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))\nlet child = UIView(frame: CGRect(x: 50, y: 50, width: 100, height: 100))\nparent.addSubview(child)\n\nprint(child.frame) // (50, 50, 100, 100) относительно parent\nprint(child.bounds) // (0, 0, 100, 100)","type":"unstyled","key":"7spi8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"После поворота:\n","type":"header-three","key":"e2erl"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":171,"offset":0,"style":"ITALIC"}],"text":"child.transform = CGAffineTransform(rotationAngle: .pi/4)\nprint(child.frame) // изменился (стал больше, сдвинулся)\nprint(child.bounds) // (0, 0, 100, 100) — НЕ изменился!","type":"unstyled","key":"orc4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"После изменения bounds.origin:\n","type":"header-three","key":"79klf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":135,"offset":0,"style":"ITALIC"}],"text":"child.bounds.origin = CGPoint(x: 20, y: 20)\n// Сабвью child (допустим, button) с frame (0,0) отрисуется в (-20, -20) относительно child","type":"unstyled","key":"2rlp5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Когда что использовать:","type":"header-three","key":"5isv8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"frame — для расположения вью относительно родителя.","type":"unordered-list-item","key":"ennu5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"bounds — для рисования внутри вью и расположения сабвью.","type":"unordered-list-item","key":"9fstm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"38. Как увеличить область нажатия на кнопку?","type":"header-two","key":"cok2p"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Способ 1: Переопределить pointInside (самый чистый)\n","type":"header-three","key":"6c45b"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":318,"offset":0,"style":"ITALIC"}],"text":"class ExtendedHitButton: UIButton {\n var hitEdgeInsets = UIEdgeInsets(top: -10, left: -10, bottom: -10, right: -10)\n \n override func pointInside(_ point: CGPoint, with event: UIEvent?) -> Bool {\n let extendedBounds = bounds.inset(by: hitEdgeInsets)\n return extendedBounds.contains(point)\n }\n}","type":"unstyled","key":"esmd8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Способ 2: Обернуть в UIView (менее предпочтительно)\n","type":"header-three","key":"banas"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":230,"offset":0,"style":"ITALIC"}],"text":"let container = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))\nlet button = UIButton(frame: CGRect(x: 20, y: 20, width: 60, height: 60))\ncontainer.addSubview(button)\n// Но контейнер ловит нажатия, нужно перенаправлять.","type":"unstyled","key":"4im0d"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Способ 3: Увеличить contentEdgeInsets (влияет на верстку)\n","type":"header-three","key":"abu58"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":131,"offset":0,"style":"ITALIC"}],"text":"button.contentEdgeInsets = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)\n// Увеличивает frame кнопки, но сдвигает контент.","type":"unstyled","key":"3deij"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Способ 4: Использовать UIButton.Configuration (iOS 15+)\n","type":"header-three","key":"b2l40"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":168,"offset":0,"style":"ITALIC"}],"text":"var config = UIButton.Configuration.plain()\nconfig.contentInsets = NSDirectionalEdgeInsets(top: 10, leading: 10, bottom: 10, trailing: 10)\nbutton.configuration = config","type":"unstyled","key":"7mnda"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Способ 5: Переопределить hitTest (для сложных иерархий)\n","type":"header-three","key":"8qsp4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":289,"offset":0,"style":"ITALIC"}],"text":"override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {\n let extendedBounds = bounds.inset(by: UIEdgeInsets(top: -20, left: -20, bottom: -20, right: -20))\n if extendedBounds.contains(point) {\n return self\n }\n return super.hitTest(point, with: event)\n}","type":"unstyled","key":"a39g6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Лучшая практика:\n","type":"header-three","key":"91q5b"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":268,"offset":0,"style":"ITALIC"}],"text":"class EnlargedButton: UIButton {\n var enlargeInset: CGFloat = 10\n \n override func pointInside(_ point: CGPoint, with event: UIEvent?) -> Bool {\n let area = bounds.insetBy(dx: -enlargeInset, dy: -enlargeInset)\n return area.contains(point)\n }\n}","type":"unstyled","key":"q397"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Проверка:","type":"header-three","key":"31vlr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Отрицательные инсеты расширяют область.","type":"unordered-list-item","key":"8asit"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Положительные — сужают.","type":"unordered-list-item","key":"cgdo0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Не влияет на отображение, только на hitTest.","type":"unordered-list-item","key":"1906d"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"39. Отличия CALayer и UIView?","type":"header-two","key":"2rmhf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":13,"offset":12,"style":"BOLD"},{"length":8,"offset":61,"style":"BOLD"},{"length":16,"offset":128,"style":"BOLD"},{"length":12,"offset":182,"style":"BOLD"},{"length":9,"offset":260,"style":"BOLD"},{"length":10,"offset":329,"style":"BOLD"},{"length":19,"offset":394,"style":"BOLD"},{"length":9,"offset":468,"style":"BOLD"},{"length":15,"offset":531,"style":"BOLD"},{"length":6,"offset":25,"style":"ITALIC"},{"length":7,"offset":44,"style":"ITALIC"},{"length":6,"offset":69,"style":"ITALIC"},{"length":7,"offset":104,"style":"ITALIC"},{"length":6,"offset":144,"style":"ITALIC"},{"length":7,"offset":161,"style":"ITALIC"},{"length":6,"offset":194,"style":"ITALIC"},{"length":7,"offset":214,"style":"ITALIC"},{"length":6,"offset":269,"style":"ITALIC"},{"length":7,"offset":298,"style":"ITALIC"},{"length":6,"offset":339,"style":"ITALIC"},{"length":7,"offset":361,"style":"ITALIC"},{"length":6,"offset":413,"style":"ITALIC"},{"length":7,"offset":428,"style":"ITALIC"},{"length":6,"offset":477,"style":"ITALIC"},{"length":7,"offset":503,"style":"ITALIC"},{"length":6,"offset":546,"style":"ITALIC"},{"length":7,"offset":585,"style":"ITALIC"}],"text":"Сравнение:\n\nНаследование\nUIView UIResponder\nCALayer NSObject\nСобытия\nUIView Обрабатывает касания, жесты\nCALayer Не обрабатывает\nResponder Chain\nUIView Участвует\nCALayer Не участвует\nAuto Layout\nUIView Поддерживает\nCALayer Не поддерживает (только через UIView)\nАнимации\nUIView Есть (обертка над CA)\nCALayer Мощные, низкоуровневые\nОтрисовка\nUIView Через draw(_:)\nCALayer Через display, draw(in:)\nПроизводительность\nUIView Тяжелее\nCALayer Легче (напрямую работает с GPU)\nИерархия\nUIView Управляет subviews\nCALayer Управляет sublayers\nЖизненный цикл\nUIView layoutSubviews, didMoveToWindow\nCALayer layoutSublayers, display","type":"unstyled","key":"5b2ju"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Взаимосвязь:","type":"header-three","key":"abip9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Каждый UIView имеет layer (свойство .layer).","type":"unordered-list-item","key":"etj4t"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"CALayer — это \"бэкенд\" отрисовки, UIView — \"фронтенд\" с логикой и событиями.","type":"unordered-list-item","key":"7e1c"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Когда использовать CALayer напрямую:","type":"header-three","key":"2s6en"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Сложные анимации (трансформации, тени, маски).","type":"unordered-list-item","key":"cg0g2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Экономия памяти (если не нужны события).","type":"unordered-list-item","key":"2nivm"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Metal-рендеринг.","type":"unordered-list-item","key":"a6f0o"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Фоновое рисование.","type":"unordered-list-item","key":"7l463"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Когда использовать UIView:","type":"header-three","key":"2rep7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Нужны касания, жесты.","type":"unordered-list-item","key":"6qn9m"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Auto Layout.","type":"unordered-list-item","key":"3lc5d"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Стандартные контролы.","type":"unordered-list-item","key":"5h15r"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Работа с ViewController.","type":"unordered-list-item","key":"3sfe5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример создания слоя без вью (но в иерархии вью):\n","type":"header-three","key":"d07ir"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":109,"offset":0,"style":"ITALIC"}],"text":"let gradientLayer = CAGradientLayer()\ngradientLayer.frame = view.bounds\nview.layer.addSublayer(gradientLayer)","type":"unstyled","key":"2c5k3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Производительность:","type":"header-three","key":"f3tor"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"1000 UIView — тормоза.","type":"unordered-list-item","key":"3irr4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"1000 CALayer — нормально (но без событий).","type":"unordered-list-item","key":"5ls28"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Итог:","type":"header-three","key":"1mms7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"UIView = CALayer + события + Auto Layout + responder 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В чем отличия UIWindow от UIView, что такое UIWindow?","type":"header-two","key":"cpj50"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"UIWindow — это:","type":"header-three","key":"6ab3b"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Специальный подкласс UIView.","type":"unordered-list-item","key":"8lduf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Корневой контейнер для всех вью приложения.","type":"unordered-list-item","key":"8qg25"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Обеспечивает связь между вью и физическим экраном.","type":"unordered-list-item","key":"4mbd7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Диспетчеризует события (касания, клавиатура, ориентация).","type":"unordered-list-item","key":"feml"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Отличия UIWindow от UIView:","type":"header-three","key":"2fi0a"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":9,"offset":1,"style":"BOLD"},{"length":16,"offset":70,"style":"BOLD"},{"length":11,"offset":137,"style":"BOLD"},{"length":8,"offset":194,"style":"BOLD"},{"length":22,"offset":266,"style":"BOLD"},{"length":10,"offset":338,"style":"BOLD"},{"length":18,"offset":394,"style":"BOLD"},{"length":8,"offset":10,"style":"ITALIC"},{"length":6,"offset":42,"style":"ITALIC"},{"length":8,"offset":86,"style":"ITALIC"},{"length":6,"offset":119,"style":"ITALIC"},{"length":8,"offset":148,"style":"ITALIC"},{"length":6,"offset":177,"style":"ITALIC"},{"length":8,"offset":202,"style":"ITALIC"},{"length":6,"offset":242,"style":"ITALIC"},{"length":8,"offset":288,"style":"ITALIC"},{"length":6,"offset":327,"style":"ITALIC"},{"length":8,"offset":348,"style":"ITALIC"},{"length":6,"offset":374,"style":"ITALIC"},{"length":8,"offset":412,"style":"ITALIC"},{"length":6,"offset":424,"style":"ITALIC"}],"text":"\nКорневой\nUIWindow Всегда корень иерархии\nUIView Может быть вложенным\nСвязь с экраном\nUIWindow Напрямую (через screen)\nUIView Через окно\nОриентация\nUIWindow Управляет поворотом\nUIView Не влияет\nСобытия\nUIWindow Первым получает и распределяет\nUIView Получает от окна\nУровень (windowLevel)\nUIWindow Есть (над/под другими окнами)\nUIView Нет\nkeyWindow\nUIWindow Только одно окно\nUIView Не применимо\nmakeKeyAndVisible\nUIWindow Да\nUIView Нет","type":"unstyled","key":"ftn8m"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Что делает UIWindow:","type":"header-three","key":"3j073"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Предоставляет область для отображения.","type":"ordered-list-item","key":"5r26o"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Маршрутизирует события касаний.","type":"ordered-list-item","key":"atkvc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Управляет анимацией переходов между ViewController.","type":"ordered-list-item","key":"8k6pn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Содержит rootViewController.","type":"ordered-list-item","key":"4e4ci"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Управляет статус-баром и ориентацией.","type":"ordered-list-item","key":"2tc12"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Иерархия:","type":"header-three","key":"eem0c"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"text","type":"unstyled","key":"bp3p3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"UIWindow (keyWindow)\n └── rootViewController.view\n └── другие вью","type":"unstyled","key":"abs01"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример создания окна вручную (редко, для мультиоконных приложений):\n","type":"header-three","key":"fb85p"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":168,"offset":0,"style":"ITALIC"}],"text":"let window = UIWindow(frame: UIScreen.main.bounds)\nwindow.rootViewController = MyViewController()\nwindow.windowLevel = .alert // поверх всех\nwindow.makeKeyAndVisible()","type":"unstyled","key":"2ob8p"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Несколько окон:","type":"header-three","key":"4rt1l"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"iOS поддерживает несколько окон (iPad, CarPlay, внешние дисплеи).","type":"unordered-list-item","key":"733rr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Но обычно одно keyWindow.","type":"unordered-list-item","key":"b0mad"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Итог:","type":"header-three","key":"ci1ve"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"UIWindow — это особое вью, корень иерархии, диспетчер событий и связи с экраном.","type":"unordered-list-item","key":"9jap7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Без окна вью не отобразятся.","type":"unordered-list-item","key":"74dm6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"41. В чем отличия setNeedsLayout, layoutIfNeeded и layoutSubviews?","type":"header-two","key":"bg01u"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"layoutSubviews()","type":"header-three","key":"dttp3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":7,"offset":22,"style":"BOLD"}],"text":"Метод UIView, который реально пересчитывает фреймы сабвью.","type":"unordered-list-item","key":"3doqc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Переопределяется для ручного позиционирования сабвью (когда Auto Layout не используется).","type":"unordered-list-item","key":"fen9c"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":20,"offset":0,"style":"BOLD"}],"text":"Не вызывать напрямую! Только через setNeedsLayout/layoutIfNeeded.","type":"unordered-list-item","key":"cgv8j"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вызывается автоматически системой в нужные моменты (поворот экрана, изменение bounds).","type":"unordered-list-item","key":"autfn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"setNeedsLayout()","type":"header-three","key":"50ugn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":8,"offset":11,"style":"BOLD"}],"text":"Асинхронно помечает вью как требующее перерасчета расположения.","type":"unordered-list-item","key":"36ksg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Возвращает управление сразу.","type":"unordered-list-item","key":"anf9u"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":25,"offset":23,"style":"BOLD"}],"text":"Вызовет layoutSubviews в следующем цикле runloop.","type":"unordered-list-item","key":"bge2k"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Можно вызывать много раз подряд — layoutSubviews выполнится один раз.","type":"unordered-list-item","key":"b966u"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"layoutIfNeeded()","type":"header-three","key":"c41vc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Синхронно проверяет флаг \"needs layout\".","type":"unordered-list-item","key":"b545l"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":10,"offset":23,"style":"BOLD"}],"text":"Если флаг установлен — немедленно вызывает layoutSubviews.","type":"unordered-list-item","key":"2tfh8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Если не установлен — ничего не делает.","type":"unordered-list-item","key":"7glsq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":6,"offset":69,"style":"BOLD"}],"text":"Используется, когда нужно гарантировать, что фреймы сабвью актуальны сейчас.","type":"unordered-list-item","key":"dvlb2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример:\n","type":"header-three","key":"938o5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":122,"offset":0,"style":"ITALIC"}],"text":"view.setNeedsLayout()\n// ... другой код\nview.layoutIfNeeded() // теперь layoutSubviews выполнится сразу, если был помечен","type":"unstyled","key":"f6alc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Связь с Auto Layout:","type":"header-three","key":"7b6gg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"При использовании Auto Layout вы не вызываете layoutSubviews напрямую.","type":"unordered-list-item","key":"dgsn5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Система сама вызывает layoutSubviews, который вызывает layoutSubviews у сабвью и применяет constraints.","type":"unordered-list-item","key":"dd95m"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Жизненный цикл:","type":"header-three","key":"eg2sg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вы меняете constraints или frame сабвью.","type":"ordered-list-item","key":"6io0c"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вызываете setNeedsLayout.","type":"ordered-list-item","key":"cal2j"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"В следующем цикле runloop система вызывает layoutSubviews (или layoutIfNeededсинхронно).","type":"ordered-list-item","key":"bkmsd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"В layoutSubviews пересчитываются фреймы (или применяются constraints).","type":"ordered-list-item","key":"2ja2k"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Частая ошибка:\n","type":"header-three","key":"25hgd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":156,"offset":0,"style":"ITALIC"}],"text":"subview.frame = newFrame\nview.layoutIfNeeded() // может не сработать, если не был setNeedsLayout\n// Правильно: view.setNeedsLayout(); view.layoutIfNeeded()","type":"unstyled","key":"atn37"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"42. Что такое intrinsicContentSize?","type":"header-two","key":"6cbgp"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"intrinsicContentSize — это естественный (внутренний) размер вью, основанный на его содержимом, без учета внешних ограничений.","type":"unstyled","key":"c4ccn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Определение:\n","type":"header-three","key":"4kc2g"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":124,"offset":0,"style":"ITALIC"}],"text":"class MyView: UIView {\n override var intrinsicContentSize: CGSize {\n return CGSize(width: 100, height: 50)\n }\n}","type":"unstyled","key":"6g7nq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Зачем нужно?","type":"header-three","key":"avt24"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Auto Layout использует intrinsicContentSize, когда нет явных width/height constraints.","type":"unordered-list-item","key":"a6eu7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Позволяет вью \"самоопределять\" свой размер.","type":"unordered-list-item","key":"jou4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Примеры стандартных вью:","type":"header-three","key":"2cumd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вью / intrinsicContentSize\nUILabel / Размер текста + шрифт\nUIImageView / Размер изображения\nUIButtonТекст / изображение + insets\nUISwitch / Фиксированный (51x31)\nUITextField / Высота шрифта + padding","type":"unstyled","key":"3mj2t"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Использование в Auto Layout:\n","type":"header-three","key":"b4km1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":152,"offset":0,"style":"ITALIC"}],"text":"let label = UILabel()\nlabel.text = \"Hello\"\n// Нет constraints на width/height\n// Система использует intrinsicContentSize = ширина текста + высота шрифта","type":"unstyled","key":"dhvp8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Когда переопределять:","type":"header-three","key":"2nm3i"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Кастомные вью с фиксированным или вычисляемым размером.","type":"unordered-list-item","key":"fglb8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Прогресс-бары, спиннеры.","type":"unordered-list-item","key":"2lmni"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вью, размер которых зависит от их содержимого (например, обертка текста).","type":"unordered-list-item","key":"3f7m9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"invalidateIntrinsicContentSize:","type":"header-three","key":"474sd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Если intrinsicContentSize изменился (например, изменился текст), нужно вызвать:","type":"unordered-list-item","key":"6fvas"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":38,"offset":0,"style":"ITALIC"}],"text":"label.invalidateIntrinsicContentSize()","type":"unstyled","key":"cvdnc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Система заново запросит intrinsicContentSize при следующем layout.","type":"unordered-list-item","key":"bp0h8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Связь с hugging/compression resistance:","type":"header-three","key":"aae9p"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":24,"offset":0,"style":"BOLD"}],"text":"Content Hugging Priority — насколько вью сопротивляется растяжению.","type":"unordered-list-item","key":"52uo2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":31,"offset":0,"style":"BOLD"}],"text":"Compression Resistance Priority — насколько вью сопротивляется сжатию.","type":"unordered-list-item","key":"9hb06"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Оба работают с intrinsicContentSize.","type":"unordered-list-item","key":"2cqgo"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример:","type":"header-three","key":"9takf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":113,"offset":0,"style":"ITALIC"}],"text":"label.setContentHuggingPriority(.required, for: .horizontal)\n// label не будет растягиваться шире intrinsic width","type":"unstyled","key":"552k4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"43. Жизненный цикл UIViewController.","type":"header-two","key":"6ckcc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Полная последовательность:","type":"unstyled","key":"4sr68"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"1. Инициализация","type":"header-three","key":"1t45o"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"init(nibName:bundle:) или init(coder:) (из storyboard)","type":"unordered-list-item","key":"3cuma"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":2,"offset":0,"style":"BOLD"}],"text":"Не используйте init для настройки UI (вью еще нет).","type":"unordered-list-item","key":"cr9e3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"2. loadView()","type":"header-three","key":"7u4se"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Создает корневой вью контроллера.","type":"unordered-list-item","key":"fcaes"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":17,"offset":0,"style":"BOLD"}],"text":"Не переопределять без крайней нужды (только для полностью кастомного вью).","type":"unordered-list-item","key":"5cqcp"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Если переопределяете — не вызывать super.","type":"unordered-list-item","key":"4887d"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"3. viewDidLoad()","type":"header-three","key":"7qgot"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вью загружена, но еще не добавлена в иерархию.","type":"unordered-list-item","key":"1jqrg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":0,"style":"BOLD"}],"text":"Лучшее место для настройки UI, добавления сабвью, загрузки данных, настройки делегатов.","type":"unordered-list-item","key":"vp10"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":8,"offset":11,"style":"BOLD"}],"text":"Вызывается один раз за жизнь контроллера.","type":"unordered-list-item","key":"ceim4"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"4. viewWillAppear(_:)","type":"header-three","key":"b0ogu"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вью вот-вот появится на экране.","type":"unordered-list-item","key":"20dfl"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Анимация появления еще не началась.","type":"unordered-list-item","key":"2ach"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Здесь обновляют данные, которые могли измениться, пока вью не было видно.","type":"unordered-list-item","key":"f29gc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вызывается каждый раз перед появлением.","type":"unordered-list-item","key":"ec8sn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"5. viewWillLayoutSubviews()","type":"header-three","key":"ar1q1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Перед первым layoutSubviews корневого вью (и при каждом изменении размеров).","type":"unordered-list-item","key":"70ui1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Редко используется, но можно для изменения constraints до layout.","type":"unordered-list-item","key":"fahvk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"6. viewDidLayoutSubviews()","type":"header-three","key":"97ldb"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"После layoutSubviews корневого вью.","type":"unordered-list-item","key":"f091a"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Здесь можно делать финальные корректировки после того, как все фреймы рассчитаны.","type":"unordered-list-item","key":"4m1ug"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"7. viewDidAppear(_:)","type":"header-three","key":"293ne"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вью полностью виден на экране.","type":"unordered-list-item","key":"e1uja"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Анимация появления завершена.","type":"unordered-list-item","key":"e71tj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Хорошее место для старта анимаций, запуска таймеров, аналитики.","type":"unordered-list-item","key":"1nlc0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"8. viewWillDisappear(_:)","type":"header-three","key":"5orbi"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вью вот-вот исчезнет.","type":"unordered-list-item","key":"20vn7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Анимация исчезновения еще не началась.","type":"unordered-list-item","key":"btuqk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Сохранить изменения, убрать клавиатуру, остановить проигрывание.","type":"unordered-list-item","key":"brkgp"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"9. viewDidDisappear(_:)","type":"header-three","key":"ac6p7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вью исчез с экрана.","type":"unordered-list-item","key":"cs4bl"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Остановить таймеры, отписаться от уведомлений, очистить кэши.","type":"unordered-list-item","key":"b9i1u"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"10. deinit","type":"header-three","key":"ei5s1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Контроллер уничтожен.","type":"unordered-list-item","key":"7j579"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"ARC освободил память.","type":"unordered-list-item","key":"3p9ek"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Проверить, что все уведомления и делегаты отписаны.","type":"unordered-list-item","key":"72oo3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Дополнительные методы:","type":"header-three","key":"muuj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"didReceiveMemoryWarning() — при нехватке памяти (освободить кэши, необязательные данные).","type":"unordered-list-item","key":"dkonh"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"willMove(toParent:) / didMove(toParent:) — при добавлении/удалении контроллера как дочернего.","type":"unordered-list-item","key":"351ja"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Порядок при повороте экрана:\n","type":"header-three","key":"4h8ri"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"viewWillLayoutSubviews\nviewDidLayoutSubviews\n(и так несколько раз)","type":"unstyled","key":"7meas"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Важно:","type":"header-three","key":"cndji"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Не вызывать методы жизненного цикла вручную (кроме super).","type":"unordered-list-item","key":"9vsov"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"При презенте/дисмиссе контроллера вызываются viewWillDisappear/viewDidDisappear у старого и viewWillAppear/viewDidAppear у нового.","type":"unordered-list-item","key":"2vis1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"44. Жизненный цикл приложения.","type":"header-two","key":"1sma2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Управляется UIApplicationDelegate (в UIKit) или AppDelegate/SceneDelegate (в современных приложениях).","type":"unstyled","key":"5a527"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Состояния приложения:","type":"header-three","key":"aujhe"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":11,"offset":0,"style":"BOLD"}],"text":"Not running — приложение не запущено или убито.","type":"ordered-list-item","key":"8k65a"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":8,"offset":0,"style":"BOLD"}],"text":"Inactive — работает, но не получает события (например, при переключении, во время звонка).","type":"ordered-list-item","key":"b8hd1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":6,"offset":0,"style":"BOLD"}],"text":"Active — нормальная работа, получает события.","type":"ordered-list-item","key":"d2ap7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":10,"offset":0,"style":"BOLD"}],"text":"Background — в фоне, выполняет код ограниченное время.","type":"ordered-list-item","key":"6vcmd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":9,"offset":0,"style":"BOLD"}],"text":"Suspended — в фоне, не выполняет код (может быть убито при нехватке памяти).","type":"ordered-list-item","key":"91h2o"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Методы делегата (AppDelegate):","type":"header-three","key":"7en2i"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":46,"offset":0,"style":"ITALIC"}],"text":"application(_:willFinishLaunchingWithOptions:)\nСамый первый метод.\nПриложение запускается, но еще не готово к отображению.","type":"ordered-list-item","key":"aqkjb"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":45,"offset":0,"style":"ITALIC"}],"text":"application(_:didFinishLaunchingWithOptions:)\nЗапуск завершен.\nМесто для инициализации сервисов, настройки UI.","type":"ordered-list-item","key":"8k9n6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":30,"offset":0,"style":"ITALIC"}],"text":"applicationDidBecomeActive(_:)\nПриложение стало активным (после willEnterForeground или сразу после запуска).\nВозобновить таймеры, анимации, обновить UI.","type":"ordered-list-item","key":"eqrpi"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":31,"offset":0,"style":"ITALIC"}],"text":"applicationWillResignActive(_:)\nПриложение скоро станет неактивным (например, звонок, свайп вверх).\nСохранить состояние, остановить таймеры, замедлить анимации.","type":"ordered-list-item","key":"e9fev"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":33,"offset":0,"style":"ITALIC"},{"length":18,"offset":60,"style":"BOLD"}],"text":"applicationDidEnterBackground(_:)\nПриложение перешло в фон.\nОграниченное время (~5 сек) для сохранения состояния. По истечении приложение может быть приостановлено.\nОсвободить ресурсы, которые не нужны в фоне.","type":"ordered-list-item","key":"6skp5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":34,"offset":0,"style":"ITALIC"}],"text":"applicationWillEnterForeground(_:)\nПриложение возвращается из фона на передний план (но еще не активно).\nОбновить данные, подготовить UI.","type":"ordered-list-item","key":"fdl04"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":28,"offset":0,"style":"ITALIC"}],"text":"applicationWillTerminate(_:)\nПриложение будет завершено (не для фоновых приложений, убитых системой).\nСохранить финальное состояние.","type":"ordered-list-item","key":"a72m1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Сценарии:","type":"header-three","key":"b0i01"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":6,"offset":0,"style":"BOLD"}],"text":"Запуск:","type":"unstyled","key":"esl06"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":58,"offset":0,"style":"ITALIC"}],"text":"willFinishLaunching → didFinishLaunching → didBecomeActive","type":"unstyled","key":"245tu"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":22,"offset":0,"style":"BOLD"}],"text":"Звонок (уходит на фон):","type":"unstyled","key":"c43n8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":37,"offset":0,"style":"ITALIC"}],"text":"willResignActive → didEnterBackground","type":"unstyled","key":"9d5f"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":17,"offset":0,"style":"BOLD"}],"text":"Возврат из звонка:","type":"unstyled","key":"ckjkc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":37,"offset":0,"style":"ITALIC"}],"text":"willEnterForeground → didBecomeActive","type":"unstyled","key":"3tjge"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":19,"offset":0,"style":"BOLD"}],"text":"Убийство приложения:","type":"unstyled","key":"2majo"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":40,"offset":0,"style":"ITALIC"}],"text":"willTerminate (только если не suspended)","type":"unstyled","key":"805ph"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"SceneDelegate (iOS 13+):","type":"header-three","key":"8tvuu"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Для многоконных приложений (iPad, CarPlay).","type":"unordered-list-item","key":"59r1p"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Методы аналогичны, но для каждой сцены (окна).","type":"unordered-list-item","key":"u1d1"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Важно:","type":"header-three","key":"6btao"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":6,"offset":7,"style":"BOLD"}],"text":"В фоне нельзя обновлять UI (приложение может быть убито).","type":"unordered-list-item","key":"6qh92"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Длительные задачи в фоне — через beginBackgroundTask.","type":"unordered-list-item","key":"aia97"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Для загрузки контента в фоне — URLSession с background configuration.","type":"unordered-list-item","key":"98b2j"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"45. Расскажи про responder chain.","type":"header-two","key":"elncs"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":15,"offset":0,"style":"BOLD"}],"text":"Responder Chain — цепочка объектов, наследующих UIResponder, которые могут обрабатывать события (касания, движения, нажатия кнопок, редактирование).","type":"unstyled","key":"3t7mi"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Участники responder chain:","type":"header-three","key":"b4np"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"UIApplication","type":"unordered-list-item","key":"81p5a"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"UIWindow","type":"unordered-list-item","key":"9g4gf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"UIViewController","type":"unordered-list-item","key":"7t7sr"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"UIView","type":"unordered-list-item","key":"4qido"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Любой кастомный UIResponder","type":"unordered-list-item","key":"79ql8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Как работает:","type":"header-three","key":"190la"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":6,"offset":0,"style":"BOLD"}],"text":"Начало — событие касания.","type":"ordered-list-item","key":"ddmus"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"hitTest находит самый глубокий UIView, содержащий точку касания.","type":"ordered-list-item","key":"6ukh"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":15,"offset":19,"style":"BOLD"}],"text":"Это вью становится first responder для касания.","type":"ordered-list-item","key":"5jvup"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Если вью не обрабатывает событие, оно передается его next responder:\nУ вью: next = его супервью (или view controller, если он есть).\nУ view controller: next = его родительский view controller (если есть) или окно.\nУ окна: next = UIApplication.\nУ UIApplication: next = app delegate (если он UIResponder).\nУ app delegate: nil (конец).","type":"ordered-list-item","key":"a3ald"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример цепочки:","type":"header-three","key":"619hc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"text","type":"unstyled","key":"bvcgs"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"UIButton (самый глубокий)\n → UIView (супервью)\n → UIViewController (владелец вью)\n → UIWindow\n → UIApplication\n → AppDelegate","type":"unstyled","key":"86aen"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Зачем это нужно?","type":"header-three","key":"a00qa"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Позволяет обрабатывать события на разных уровнях.","type":"unordered-list-item","key":"1tvbn"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Например, кнопка обрабатывает нажатие сама, а жест свайпа — родительское вью.","type":"unordered-list-item","key":"a7huc"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Удобно для глобальных действий (например, \"shake\" обрабатывает app delegate).","type":"unordered-list-item","key":"38p23"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Методы для работы с responder chain:","type":"header-three","key":"1t63j"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"next — следующий responder.","type":"unordered-list-item","key":"fdias"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"becomeFirstResponder() / resignFirstResponder() — для управления фокусом ввода.","type":"unordered-list-item","key":"fg7rq"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"canBecomeFirstResponder — можно ли стать первым.","type":"unordered-list-item","key":"2rkhp"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"touchesBegan/Moved/Ended/Cancelled — обработка касаний.","type":"unordered-list-item","key":"7lemt"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример переопределения:\n","type":"header-three","key":"56tbg"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":217,"offset":0,"style":"ITALIC"}],"text":"override func touchesBegan(_ touches: Set, with event: UIEvent?) {\n // обработать сами\n if !handleTouch(touches) {\n // или передать дальше\n next?.touchesBegan(touches, with: event)\n }\n}","type":"unstyled","key":"co76b"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"События, которые идут по responder chain:","type":"header-three","key":"fm56j"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Касания (touches...)","type":"unordered-list-item","key":"90dd8"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Движения (акселерометр)","type":"unordered-list-item","key":"65vs0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Удаленные события (пульт Apple TV)","type":"unordered-list-item","key":"bijr7"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Действия с клавиатуры","type":"unordered-list-item","key":"9tt2s"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Редактирование текста","type":"unordered-list-item","key":"533j6"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"46. hitTest и pointInside: в чем отличия? Для чего нужны?","type":"header-two","key":"6kaov"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Оба метода используются для определения того, какое вью получит касание.","type":"unstyled","key":"390kk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"pointInside(point:with:event:) -> Bool","type":"header-three","key":"es1u9"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":9,"offset":0,"style":"BOLD"}],"text":"Проверяет, принадлежит ли точка текущему вью.","type":"unordered-list-item","key":"eani2"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Не ищет сабвью.","type":"unordered-list-item","key":"8geh5"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"По умолчанию проверяет, находится ли точка в bounds вью.","type":"unordered-list-item","key":"boho3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Можно переопределить для расширения/сужения области нажатия.","type":"unordered-list-item","key":"bs9bv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"hitTest(_:with:) -> UIView?","type":"header-three","key":"3pn74"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":7,"offset":0,"style":"BOLD"}],"text":"Находит самый глубокий вью, который должен получить касание.","type":"unordered-list-item","key":"f39m"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Вызывает pointInside для себя, если false — возвращает nil.","type":"unordered-list-item","key":"ec4lv"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Если true — рекурсивно вызывает hitTest для всех сабвью (в обратном порядке добавления).","type":"unordered-list-item","key":"a0303"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Возвращает первое ненулевое значение от сабвью, либо себя, если сабвью не подошли.","type":"unordered-list-item","key":"40vm0"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Отличия:","type":"header-three","key":"2n9tf"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":12,"offset":0,"style":"BOLD"},{"length":12,"offset":86,"style":"BOLD"},{"length":13,"offset":131,"style":"BOLD"},{"length":20,"offset":170,"style":"BOLD"},{"length":12,"offset":12,"style":"ITALIC"},{"length":7,"offset":59,"style":"ITALIC"},{"length":13,"offset":98,"style":"ITALIC"},{"length":7,"offset":116,"style":"ITALIC"},{"length":12,"offset":144,"style":"ITALIC"},{"length":7,"offset":160,"style":"ITALIC"},{"length":11,"offset":192,"style":"ITALIC"},{"length":7,"offset":227,"style":"ITALIC"}],"text":"\nЧто делает\npointInside Проверяет принадлежность точки вью\nhitTest Находит целевое вью\nВозвращает\npointInside Bool\nhitTest UIView?\nРекурсивный\npointInside Нет\nhitTest Да\nКогда переопределять\npointInside Расширение hit-области\nhitTest Полная кастомная логика поиска","type":"unstyled","key":"bhqic"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример переопределения pointInside (увеличение области):\n","type":"header-three","key":"71jv3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":177,"offset":0,"style":"ITALIC"}],"text":"override func pointInside(_ point: CGPoint, with event: UIEvent?) -> Bool {\n let extendedBounds = bounds.insetBy(dx: -20, dy: -20)\n return extendedBounds.contains(point)\n}","type":"unstyled","key":"nk7u"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Пример переопределения hitTest (игнорирование касаний):\n","type":"header-three","key":"1vidd"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":248,"offset":0,"style":"ITALIC"}],"text":"override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {\n if self.isHidden || !self.isUserInteractionEnabled {\n return nil\n }\n // Пропускаем касания сквозь себя\n return super.hitTest(point, with: event) ?? nil\n}","type":"unstyled","key":"af17r"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Типичное использование:","type":"header-three","key":"20l7s"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":26,"offset":0,"style":"BOLD"}],"text":"Увеличение области нажатия — переопределить pointInside.","type":"ordered-list-item","key":"2fh26"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":26,"offset":0,"style":"BOLD"}],"text":"Пропуск касаний сквозь вью — переопределить hitTest, вернуть nil для себя, но не для сабвью.","type":"ordered-list-item","key":"d55pk"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":33,"offset":0,"style":"BOLD"}],"text":"Делегирование касаний другому вью — переопределить hitTest и вернуть другое вью.","type":"ordered-list-item","key":"4bnhj"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Порядок вызовов:","type":"header-three","key":"bobqt"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"text","type":"unstyled","key":"cos8o"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"touch → window.hitTest()\n → view.hitTest() (корневое)\n → view.pointInside()\n → для каждого сабвью в обратном порядке: subview.hitTest()","type":"unstyled","key":"6nrh"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"Важно:","type":"header-three","key":"anjn3"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"hitTest игнорирует вью с isUserInteractionEnabled = false.","type":"unordered-list-item","key":"e9j60"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"hitTest игнорирует вью с isHidden = true.","type":"unordered-list-item","key":"fqcct"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"hitTest игнорирует вью с alpha < 0.01 (почти прозрачные).","type":"unordered-list-item","key":"dnamu"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[],"text":"47. Расскажи про Core Animation.","type":"header-two","key":"fee3l"},{"data":{},"depth":0,"entityRanges":[],"inlineStyleRanges":[{"length":14,"offset":0,"style":"BOLD"}],"text":"Core Animation — фреймворк для рендеринга и анимации графики на iOS/macOS. 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