#ios
Вопрос:
В своем приложении я использую WKWebView для извлечения данных с веб-сайта, которые я обрабатываю в веб-представлении перед отправкой через window.webkit.abc.postMessage(result); . В большинстве случаев это работает хорошо, но иногда требуется обработать большой объем данных, что приводит к сбою приложения в потоке 0 (основной поток?)
Что касается быстрой стороны, я думаю, что сделал все возможное, чтобы избежать ненужного времени выполнения в основном потоке.
В Swift для запуска скрипта, который будет запущен на веб-сайте, я делаю
DispatchQueue.global(qos: .userInitiated).async { //some processing DispatchQueue.main.async { self.webview?.evaluateJavaScript(js, completionHandler: { ... что, по-моему, не является причиной аварии.
Чтобы обработать возвращенные данные, я стараюсь покинуть основной поток как можно раньше:
func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) { let messageResult = message.body guard let messageType = MessageTypes.init(rawValue: message.name) else { return; } DispatchQueue.global(qos: DispatchQoS.QoSClass.userInitiated).async { //processing the data Теперь к самому сбою: множество символов в трассировке можно найти в ссылках в битах webview с открытым исходным кодом. (см. внизу)
Поскольку WebUserContentControllerProxy появляется довольно глубоко в трассировке стека, я полагаю, что проблема где-то там. Однако, поскольку я как можно раньше выгружаю работу из основного потока в этом методе делегирования, я не понимаю, как это может заблокировать основной поток. Чтобы обновить пользовательский интерфейс, я делаю несколько вызовов DispatchQueue.main.async , однако в трассировке стека не отображается никаких ссылок ни на что, что там называется.
Также я смущен тем Fault hit memory shortage , что звучит как проблема с оперативной памятью, а что похоже на проблему с exhausted real (wall clock) time allowance of 10.00 seconds процессором. Добавляя к территории оперативной памяти, в какой-то момент в трассировке говорится 1.5G , что действительно звучит как много для iPhone 6s, однако, если это было причиной, я не понимаю time allowance ошибку, так как я не интерпретирую процессор и оперативную память как взаимозаменяемые таким образом.
For more detail, here are the relevant bits of the stack trace:
{ "uptime" : 570000, "procLaunch" : "2021-11-24 23:03:38.2950 0100", "procRole" : "Non UI", "version" : 2, "userID" : 501, "deployVersion" : 210, "modelCode" : "iPhone8,1", "procStartAbsTime" : 13804560744125, "coalitionID" : 6206, "osVersion" : { "isEmbedded" : true, "train" : "iPhone OS 15.0.1", "releaseType" : "User", "build" : "19A348" }, "captureTime" : "2021-11-24 23:03:59.3988 0100", "incident" : "A93DB923-675B-453E-9365-8EBDBBF6F604", "bug_type" : "309", "pid" : 30912, "procExitAbsTime" : 13805050449362, "cpuType" : "ARM-64", "procName" : "--", "procPath" : "/private/var/containers/Bundle/Application/ --", "parentProc" : "launchd", "parentPid" : 1, "isBeta" : 1, "basebandVersion" : "9.01.00", "isCorpse" : 1, "exception" : {"codes":"0x0000000000000000, 0x0000000000000000","rawCodes":[0,0],"type":"EXC_CRASH","signal":"SIGKILL"}, "termination" : {"flags":6,"code":2343432205,"namespace":"FRONTBOARD","reasons":["lt;RBSTerminateContext| domain:10 code:0x8BADF00D explanation:scene-update watchdog transgression: applicationlt;--tgt;:30912 exhausted real (wall clock) time allowance of 10.00 seconds","ProcessVisibility: Background","ProcessState: Running","WatchdogEvent: scene-update","WatchdogVisibility: Background","WatchdogCPUStatistics: (",""Elapsed total CPU time (seconds): 21.950 (user 21.950, system 0.000), 100% CPU",",""Elapsed application CPU time (seconds): 4.566, 21% CPU"",") reportType:CrashLog maxTerminationResistance:Interactivegt;"]}, "ktriageinfo" : "VM - Fault hit memory shortagenVM - Fault hit memory shortagenVM - Fault hit memory shortagenVM - Fault hit memory shortagenVM - Fault hit memory shortagen", "faultingThread" : 0, "threads" : [{"triggered":true,"id":4109934,"queue":"com.apple.main-thread","frames":[{"imageOffset":6292,"symbol":"_platform_memmove","symbolLocation":116,"imageIndex":0},{"imageOffset":1347256,"symbol":"IPC::ArrayReferencelt;unsigned char, 18446744073709551615ulgt;::vector() 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