即使在模拟器上运行 iOS 应用程序也会在 iPhone 上崩溃

Question

尽管它在模拟器上运行良好，但我的多视图应用程序在 iPhone 5 C 上崩溃（我的意思是“很好”，我的意思是没有内存泄漏、按钮移动到位时的流畅动画等）。该应用程序是用 Objective C 编写的，模拟器在 Xcode 8.3.3 下运行。手机运行 iOS 10.3.3。

当我按下从SyncViewController 切换到PlayViewController 的同步按钮时，即在从 VC1 成功切换到 VC2 到 VC3 后从 VC3 到 VC4 时，就会出现问题。每个ViewController 都有一个委托方法来响应从前一个ViewController. 中按下的按钮

崩溃始终在以下方法中发生，该方法在PlayView 中显示三件事：一个水平滚动的图形乐谱、一个带有每秒覆盖的时间显示的按钮和一个停止按钮。

- (UIView *)showScoreClockAndExit:(CGRect)panel highlight:(int)currentState seconds:(NSUInteger)clockCount {

    if (!self.seconds) 
    {
    [self.seconds removeFromSuperview];
    self.seconds                            = [[ClockButton alloc] loadClockButton:(NSUInteger)clockCount];
    [self addSubview:_seconds];
    }

    ClockButton *seconds                    = [[ClockButton alloc] loadClockButton:(NSUInteger)clockCount];
    [self addSubview:seconds];

    EscButton *escape                       = [[EscButton alloc]         loadEscButton:(NSString *)@"stop"];
    [self addSubview:escape];

    GraphicScore *score                     = [[GraphicScore alloc] createGraphicScore:(CGRect)panel highlight:(int)currentState];
    [self addSubview:score];

    return self;
}

奇怪的是，之前由SyncViewController 加载的最后一个UIView 仍然冻结在设备本身上，即使PlayViewController 已经开始从SyncViewController, 接管，即PlayView 已加载，@987654333 @ 已设置，所选播放器的播放状态已启用，调试日志（下面）清楚地显示了

2017-07-24 15:25:24.950097+1000 SatGam2[3052:1712261] PlayView loaded (selectedFamily:1 selectedPlayerID:1)
2017-07-24 15:25:24.950923+1000 SatGam2[3052:1712261] TIME: 00:00
2017-07-24 15:25:24.951905+1000 SatGam2[3052:1712261] ENABLED (player 1: state 0)
(lldb) 

根据我找到的 here 的有用线索，我输入：bt 并按下：Enter 以获取以下日志

SatGam2 was compiled with optimization - stepping may behave oddly; variables may not be available.
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0xe15d25d2)
    frame #0: 0x1b300694 libobjc.A.dylib`objc_retain + 4
    frame #1: 0x21291d0a UIKit`-[UIView(Hierarchy) addSubview:] + 18
  * frame #2: 0x000c2696 SatGam2`-[PlayView showScoreClockAndExit:highlight:seconds:](self=0x15e9ed70, _cmd=<unavailable>, panel=<unavailable>, currentState=<unavailable>, clockCount=<unavailable>) at PlayView.m:215 [opt]
    frame #3: 0x000c246c SatGam2`-[PlayView initWithFrame:state:family:player:cue:seconds:](self=<unavailable>, _cmd=<unavailable>, frame=<unavailable>, currentState=<unavailable>, selectedFamily=<unavailable>, selectedPlayerID=<unavailable>, entryString=@"", clockCount=<unavailable>) at PlayView.m:149 [opt]
    frame #4: 0x000cd0da SatGam2`-[PlayViewController nextState](self=0x168aae00, _cmd=<unavailable>) at PlayViewController.m:244 [opt]
    frame #5: 0x000ccc40 SatGam2`-[PlayViewController viewDidLoad](self=0x168aae00, _cmd=<unavailable>) at PlayViewController.m:152 [opt]
    frame #6: 0x2128b27e UIKit`-[UIViewController loadViewIfRequired] + 966
    frame #7: 0x2128aea0 UIKit`-[UIViewController view] + 22
    frame #8: 0x000c1266 SatGam2`-[MultiviewViewController displayView:](self=0x15d85710, _cmd=<unavailable>, intNewView=4) at MultiviewViewController.m:45 [opt]
    frame #9: 0x000c2fb6 SatGam2`-[SyncViewController fromSyncButton:](self=<unavailable>, _cmd=<unavailable>, button=<unavailable>) at SyncViewController.m:65 [opt]
    frame #10: 0x212bf784 UIKit`-[UIApplication sendAction:to:from:forEvent:] + 76
    frame #11: 0x212bf718 UIKit`-[UIControl sendAction:to:forEvent:] + 62
    frame #12: 0x212a9d48 UIKit`-[UIControl _sendActionsForEvents:withEvent:] + 478
    frame #13: 0x212bf054 UIKit`-[UIControl touchesEnded:withEvent:] + 604
    frame #14: 0x212beb9e UIKit`-[UIWindow _sendTouchesForEvent:] + 2094
    frame #15: 0x212b9ade UIKit`-[UIWindow sendEvent:] + 2798
    frame #16: 0x2128b682 UIKit`-[UIApplication sendEvent:] + 308
    frame #17: 0x21a1ede6 UIKit`__dispatchPreprocessedEventFromEventQueue + 2254
    frame #18: 0x21a1978a UIKit`__handleEventQueue + 4186
    frame #19: 0x21a19b6c UIKit`__handleHIDEventFetcherDrain + 144
    frame #20: 0x1c01bfdc CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 12
    frame #21: 0x1c01bb04 CoreFoundation`__CFRunLoopDoSources0 + 424
    frame #22: 0x1c019f50 CoreFoundation`__CFRunLoopRun + 1160
    frame #23: 0x1bf6d1ae CoreFoundation`CFRunLoopRunSpecific + 470
    frame #24: 0x1bf6cfd0 CoreFoundation`CFRunLoopRunInMode + 104
    frame #25: 0x1d717b40 GraphicsServices`GSEventRunModal + 80
    frame #26: 0x212eee12 UIKit`UIApplicationMain + 150
    frame #27: 0x1b75a4ea libdyld.dylib`start + 2
(lldb)

我清除了之前在手机上测试过的所有应用。我还尝试了上个月备份的应用程序版本，以消除我开始使用deviceMotion 以来可能引入的任何问题。但问题依旧。

有人见过这样的吗？我会从哪里开始？例如比如我会在哪里设置断点？

Answer 1

此检查不正确。

if (!self.seconds) 
    {
    [self.seconds removeFromSuperview];
    self.seconds                            = [[ClockButton alloc] loadClockButton:(NSUInteger)clockCount];
    [self addSubview:_seconds];
    }

!self.seconds 如果是布尔值，则可以使用。在这种情况下，似乎 self.seconds 是某种观点。所以你应该做的是：

if (self.seconds!=nil) {
  [self.seconds removeFromSuperView]; 
  self.seconds                            = [[ClockButton alloc] loadClockButton:(NSUInteger)clockCount];
        [self addSubview:_seconds];
}