Question

我的iPhone应用程序偶尔崩溃，我遇到以下异常

NSGenericException', reason: '*** Collection <CALayerArray: 0x26f6b0> was mutated while being enumerated.

在

的崩溃线程上使用堆栈跟踪

Thread 0 Crashed:
0   libSystem.B.dylib                   0x00078ac8 __kill + 8
1   libSystem.B.dylib                   0x00078ab8 kill + 4
2   libSystem.B.dylib                   0x00078aaa raise + 10
3   libSystem.B.dylib                   0x0008d03a abort + 50
4   libstdc++.6.dylib                   0x00044a20 __gnu_cxx::__verbose_terminate_handler() + 376
5   libobjc.A.dylib                     0x00005958 _objc_terminate + 104
6   libstdc++.6.dylib                   0x00042df2 __cxxabiv1::__terminate(void (*)()) + 46
7   libstdc++.6.dylib                   0x00042e46 std::terminate() + 10
8   libstdc++.6.dylib                   0x00042f16 __cxa_throw + 78
9   libobjc.A.dylib                     0x00004838 objc_exception_throw + 64
10  CoreFoundation                      0x0009f850 __NSFastEnumerationMutationHandler + 208
11  libobjc.A.dylib                     0x0000a51a objc_enumerationMutation + 18
12  UIKit                               0x00007bfe -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 142
13  UIKit                               0x00007c2e -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 190
14  UIKit                               0x00007cd2 -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:] + 22
15  UIKit                               0x00007628 -[UIView(Internal) _addSubview:positioned:relativeTo:] + 304
16  UIKit                               0x000074e8 -[UIView(Hierarchy) addSubview:] + 16
17  UIKit                               0x0006c350 +[UIViewControllerWrapperView wrapperViewForView:frame:] + 232
18  UIKit                               0x00077d0c -[UINavigationController _startTransition:fromViewController:toViewController:] + 468
19  UIKit                               0x00077abc -[UINavigationController _startDeferredTransitionIfNeeded] + 176
20  UIKit                               0x00077a00 -[UINavigationController viewWillLayoutSubviews] + 8
21  UIKit                               0x0006dca8 -[UILayoutContainerView layoutSubviews] + 132
22  UIKit                               0x0000fbc0 -[UIView(CALayerDelegate) _layoutSublayersOfLayer:] + 20
23  CoreFoundation                      0x0003e2e4 -[NSObject(NSObject) performSelector:withObject:] + 16
24  QuartzCore                          0x0000f942 -[CALayer layoutSublayers] + 114
25  QuartzCore                          0x0000f6fa CALayerLayoutIfNeeded + 178
26  QuartzCore                          0x000094c4 CA::Context::commit_transaction(CA::Transaction*) + 204
27  QuartzCore                          0x000092da CA::Transaction::commit() + 186
28  QuartzCore                          0x0002d9b6 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 46
29  CoreFoundation                      0x00030236 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 10
30  CoreFoundation                      0x000300aa __CFRunLoopDoObservers + 406
31  CoreFoundation                      0x000276b4 __CFRunLoopRun + 848
32  CoreFoundation                      0x00027270 CFRunLoopRunSpecific + 224
33  CoreFoundation                      0x00027178 CFRunLoopRunInMode + 52
34  GraphicsServices                    0x000045ec GSEventRunModal + 108
35  GraphicsServices                    0x00004698 GSEventRun + 56
36  UIKit                               0x0000411c -[UIApplication _run] + 396
37  UIKit                               0x00002128 UIApplicationMain + 664
38  iDriveGreen                         0x00003026 main (main.m:13)
39  iDriveGreen                         0x00002ff0 start + 32

执行以下代码后会触发此崩溃。

StopRouteViewController *stopVC = [[StopRouteViewController alloc] init];   
[UIView transitionWithView:self.navigationController.view
                  duration:0.5
                   options:UIViewAnimationOptionTransitionFlipFromLeft
                animations:^{
                    [self.navigationController pushViewController:stopVC animated:NO];
                }
                completion:NULL];
[stopVC release];

对任何人来说，这看起来是否明显错误？我当前的想法是，要么在推送之前释放stopVC，要么在使用navigationController.view进行转换的同时将新的viewController推送到navigationController。

由于这种情况偶尔会发生，所以在我做出潜在修复之前，我希望能有一点信心。

Answer 1

是的，这是API的错误使用。 - [UINavigationController pushViewController：animated：]自己处理动画。即使你传递NO作为第二个参数，它仍然在操纵视图层次结构，这是导致崩溃的原因。

基本上，没有理由在动画块中调用 - [UINavigationController pushViewController：animated：]，就像你所做的那样。如果要为控制器的推送设置动画，请将YES作为第二个参数传递。

UIView transitionWithView期间的枚举变异

1 个答案: