我已经提交了我的应用进行审核，苹果回复了我，说它在启动时崩溃了。我将.app文件提交给了Apple，并将其安装在模拟器上。
xcrun simctl install booted /Users/venkatanandamuri/Desktop/prod\ crash/Myapp.app
它确实在启动时崩溃了。
Mac控制台日志中没有显示有关模拟器崩溃的任何信息。
我从Xcode设备日志中获取了崩溃日志：
Last Exception Backtrace:
0 CoreFoundation 0x1d590a3a8 __exceptionPreprocess + 232
1 libobjc.A.dylib 0x1d4b0fd00 objc_exception_throw + 59
2 CoreFoundation 0x1d58229f8 -[NSObject+ 223736 (NSObject) doesNotRecognizeSelector:] + 143
3 CoreFoundation 0x1d590fd54 ___forwarding___ + 1411
4 CoreFoundation 0x1d5911b50 _CF_forwarding_prep_0 + 95
5 FBSDKCoreKit 0x105f67530 0x105f24000 + 275760
6 FBSDKCoreKit 0x105f673ac 0x105f24000 + 275372
7 FBSDKCoreKit 0x105f2df28 0x105f24000 + 40744
8 FBSDKCoreKit 0x105f2b0b0 0x105f24000 + 28848
9 FBSDKCoreKit 0x105f2afbc 0x105f24000 + 28604
10 FBSDKCoreKit 0x105f70fe0 0x105f24000 + 315360
11 FBSDKCoreKit 0x105f7078c 0x105f24000 + 313228
12 FBSDKCoreKit 0x105f2bb28 0x105f24000 + 31528
13 FBSDKCoreKit 0x105f34cac 0x105f24000 + 68780
14 Foundation 0x1d638115c __57-[NSNotificationCenter addObserver:selector:name:object:]_block_invoke_2 + 27
15 CoreFoundation 0x1d5878acc __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 27
16 CoreFoundation 0x1d5878a8c ___CFXRegistrationPost_block_invoke + 67
17 CoreFoundation 0x1d5877f30 _CFXRegistrationPost + 419
18 CoreFoundation 0x1d5877bbc ___CFXNotificationPost_block_invoke + 99
19 CoreFoundation 0x1d57ee768 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1503
20 CoreFoundation 0x1d5877664 _CFXNotificationPost + 715
21 Foundation 0x1d62727c4 -[NSNotificationCenter postNotificationName:object:userInfo:] + 71
22 UIKitCore 0x202bd2398 -[UIApplication _stopDeactivatingForReason:] + 1339
23 UIKitCore 0x20247010c __125-[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:]_block_invoke + 487
24 UIKitCore 0x202470e5c _performActionsWithDelayForTransitionContext + 119
25 UIKitCore 0x20246feb8 -[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:] + 259
26 UIKitCore 0x202474ea8 -[_UICanvas scene:didUpdateWithDiff:transitionContext:completion:] + 363
27 UIKitCore 0x2027bb904 -[UIApplicationSceneClientAgent scene:handleEvent:withCompletion:] + 479
28 FrontBoardServices 0x1d82ccc58 __80-[FBSSceneImpl updater:didUpdateSettings:withDiff:transitionContext:completion:]_block_invoke_3 + 243
29 libdispatch.dylib 0x1d5319884 _dispatch_client_callout + 19
30 libdispatch.dylib 0x1d531ce5c _dispatch_block_invoke_direct + 251
31 FrontBoardServices 0x1d830918c __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 47
32 FrontBoardServices 0x1d8308e08 -[FBSSerialQueue _performNext] + 435
33 FrontBoardServices 0x1d8309404 -[FBSSerialQueue _performNextFromRunLoopSource] + 55
34 CoreFoundation 0x1d589a444 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 27
35 CoreFoundation 0x1d589a3c0 __CFRunLoopDoSource0 + 91
36 CoreFoundation 0x1d5899c7c __CFRunLoopDoSources0 + 179
37 CoreFoundation 0x1d5894950 __CFRunLoopRun + 987
38 CoreFoundation 0x1d5894254 CFRunLoopRunSpecific + 451
39 GraphicsServices 0x1d7ad3d8c GSEventRunModal + 107
40 UIKitCore 0x202bdc4c0 UIApplicationMain + 215
41 MyApp 0x104d97148 0x104d90000 + 29000
42 libdyld.dylib 0x1d5350fd8 start + 3
我用符号表示崩溃日志，发现：
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x00000001f1be50dc 0x1f1bc2000 + 143580
指向
NSNotificationName.TimeOutUserInteraction.unsafeMutableAddressor (in MyApp) (InterractionUIApplication.swift:0)
我注释了与此通知相关的行，并批准了该应用。
令人惊讶的是，与此相关的代码不会在应用启动时被调用。正如我在代码库中搜索的那样，这是不可能的，并且仅在登录过程中会调用此代码，而不会在应用程序启动时调用。
我想知道为什么它会崩溃，为什么在注释掉代码后却没有崩溃。
与此通知相关的代码：
import UIKit
// User Activity Timer
extension NSNotification.Name {
public static let TimeOutUserInteraction: NSNotification.Name = NSNotification.Name(rawValue: "TimeOutUserInteraction")
}
class InterractionUIApplication: UIApplication {
static let timeoutInSeconds: TimeInterval = 60 * 10 // 10 minutes
private var idleTimer: Timer?
private var enabledUserInteractionTracking: Bool = false
func startUserInternactionTracking() {
enabledUserInteractionTracking = true
resetIdleTimer()
}
func stopUserInternactionTracking() {
enabledUserInteractionTracking = false
if let idleTimer = idleTimer {
idleTimer.invalidate()
}
idleTimer = nil
}
// Resent the timer because there was user interaction.
func resetIdleTimer() {
if let idleTimer = idleTimer {
idleTimer.invalidate()
}
idleTimer = Timer.scheduledTimer(timeInterval: InterractionUIApplication.timeoutInSeconds, target: self, selector: #selector(idleTimerExceeded), userInfo: nil, repeats: false)
}
// If the timer reaches the limit as defined in timeoutInSeconds, post this notification.
@objc func idleTimerExceeded() {
NotificationCenter.default.post(name: Notification.Name.TimeOutUserInteraction, object: nil)
}
}
和在MyAppManager类中：
func startUserInternactionTracking()
{
(UIApplication.shared as? InterractionUIApplication)?.startUserInternactionTracking()
NotificationCenter.default.addObserver(self, selector: #selector(onTimeOutUserInteraction), name: Notification.Name.TimeOutUserInteraction, object: nil) //This is the commented out line to make review successful
}
func stopUserInternactionTracking()
{
(UIApplication.shared as? InterractionUIApplication)?.stopUserInternactionTracking()
NotificationCenter.default.removeObserver(self, name: Notification.Name.TimeOutUserInteraction, object: nil)
}
我确定在应用启动期间不会调用startUserInternactionTracking。但是我想知道为什么这是崩溃的原因吗？
在AppDelegate中，我初始化管理器类：
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
var appManager = MyAppManager()
.....
}
请不要将此崩溃仅发生在经过测试的苹果设备上。预生产版本在我们所有的测试设备中均按预期工作。我缺乏调试此类崩溃的经验。我从未见过。
有人可以指出我正确的方向吗？
答案 0 :(得分：1)
子类化UIApplication似乎是可能的原因。根据{{3}}
子类注释
大多数应用程序不需要子类化UIApplication。而是使用应用程序委托来>管理系统与应用程序之间的交互。 如果您的应用必须在系统之前处理传入事件，这种情况非常少见 情况-您可以实施自定义事件或操作分配机制。要执行此操作，请子类化UIApplication并重写sendEvent（ :)和/或 sendAction（：to：from：for :)方法。对于您拦截的每个事件，都将其调度 处理事件后，通过调用[super sendEvent：event]返回系统。 >几乎不需要拦截事件，因此应尽可能避免。
您实际上是在实例化该子类而不是UIApplication吗？为此，您需要创建一个main.swift文件并调用UIApplicationMain(,,,)并从UIApplicationDelegate子类顶部删除默认的@UIApplicationMain宏。
但是，正如文档所说，您似乎并不需要真正地继承UIApplication，我建议您研究documentation从管理应用级逻辑的应用程序委托实例化AppController类。