在iOS 8中测试应用程序时，ActionSheet会因访问不良而崩溃。 （Xcode 6 beta 2，iOS 8模拟器）
此处有相关帖子：UIActionSheet crash in iOS8beta
乐器会抓住与UIPresentationController相关的僵尸。我不确定我是否正确阅读，但似乎保留计数从6下降到-1。
这是完整的日志：
Event Type ∆ RefCt RefCt Timestamp Responsible Library Responsible Caller
0 Malloc +1 1 00:14.487.023 UIKit UINibDecoderDecodeObjectForValue
1 Retain +1 2 00:14.493.979 UIKit -[UIRuntimeConnection initWithCoder:]
2 Retain +1 3 00:14.494.009 UIKit -[UIRuntimeConnection initWithCoder:]
3 Retain +1 4 00:14.494.069 UIKit UINibDecoderDecodeObjectForValue
4 Retain +1 5 00:14.494.089 UIKit UINibDecoderDecodeObjectForValue
5 Retain +1 6 00:14.494.190 Foundation _NSSetUsingKeyValueSetter
6 Retain +1 7 00:14.494.257 UIKit -[UINib instantiateWithOwner:options:]
7 Release -1 6 00:14.494.395 UIKit -[UIRuntimeConnection dealloc]
8 Release -1 5 00:14.494.414 UIKit -[UIRuntimeConnection dealloc]
Release (2) -2 00:14.494.435 UIKit -[UINibDecoder finishDecoding]
10 Release -1 3 00:14.494.458 UIKit -[UINibDecoder finishDecoding]
12 Retain +1 3 00:14.496.105 Vit Calc -[RBCViewController actionSheet:clickedButtonAtIndex:]
Retain/Release (2) 00:14.496.275 UIKit -[_UIFullscreenPresentationController _setPresentedViewController:]
14 Retain +1 5 00:14.510.866 UIKit -[UIViewController setChildModalViewController:]
15 Retain +1 6 00:14.510.886 UIKit -[UIApplication _addViewControllerForLockingStatusBarTintColor:]
Retain/Release (2) 00:14.511.042 UIKit -[UIPresentationController runTransitionForCurrentState]
17 Retain +1 8 00:14.511.112 libsystem_sim_blocks.dylib _Block_object_assign
18 Retain +1 9 00:14.511.135 libsystem_sim_blocks.dylib _Block_object_assign
19 Release -1 8 00:14.511.152 UIKit -[UIActionSheet _indexTapped:]
20 Release -1 7 00:14.514.081 GraphicsServices GSEventRunModal
21 Release -1 6 00:14.514.098 UIKit -[UIStoryboardScene dealloc]
22 Retain +1 7 00:14.556.304 UIKit -[UIPeripheralHost(UIKitInternal) _beginPinningInputViewsOnBehalfOfResponder:]
23 Retain +1 8 00:14.564.411 UIKit -[UIViewController _setPresentedStatusBarViewController:]
24 Release -1 7 00:14.564.660 UIKit __destroy_helper_block_1444
25 Release -1 6 00:14.564.715 UIKit -[UIPeripheralHost(UIKitInternal) _stopPinningInputViewsOnBehalfOfResponder:]
26 Release -1 5 00:14.564.721 UIKit __destroy_helper_block_382
Retain/Release (2) 00:14.581.427 Foundation +[NSConcreteNotification newTempNotificationWithName:object:userInfo:]
Retain/Release (2) 00:14.595.199 Foundation +[NSConcreteNotification newTempNotificationWithName:object:userInfo:]
Retain/Release (4) 00:14.607.299 UIKit -[UIResponder becomeFirstResponder]
34 Retain +1 5 00:16.014.292 UIKit -[UIViewController _dismissViewControllerWithAnimationController:interactionController:completion:]
Retain/Release (2) 00:16.014.324 UIKit -[UIPresentationController runTransitionForCurrentState]
36 Retain +1 7 00:16.014.399 libsystem_sim_blocks.dylib _Block_object_assign
37 Release -1 6 00:16.014.430 UIKit -[UIViewController _dismissViewControllerWithAnimationController:interactionController:completion:]
38 Release -1 5 00:16.036.310 UIKit -[UIViewController _setPresentedStatusBarViewController:]
39 Release -1 4 00:16.036.802 UIKit __destroy_helper_block_382
42 Retain +1 5 00:16.546.187 UIKit -[UIViewController _didFinishDismissTransition]
43 Retain +1 6 00:16.546.190 UIKit -[UIApplication _removeViewControllerForLockingStatusBarTintColor:]
44 Release -1 5 00:16.546.190 UIKit -[UIApplication _removeViewControllerForLockingStatusBarTintColor:]
45 Release -1 4 00:16.546.191 UIKit -[UIApplication _removeViewControllerForLockingStatusBarTintColor:]
46 Release -1 3 00:16.546.192 UIKit -[UIViewController setChildModalViewController:]
47 Release -1 2 00:16.546.195 UIKit -[UIViewController _didFinishDismissTransition]
50 Zombie -1 00:18.518.590 UIKit -[UIPresentationController runTransitionForCurrentState]
50 Zombie -1 00：18.518.590 UIKit - [UIPresentationController runTransitionForCurrentState]
短版（已过滤）
Event Type ∆ RefCt RefCt Timestamp Responsible Library Responsible Caller
Retain/Release (2) 00:14.496.275 UIKit -[_UIFullscreenPresentationController _setPresentedViewController:]
1 Retain +1 7 00:14.511.042 UIKit -[UIPresentationController runTransitionForCurrentState]
2 Retain +1 8 00:14.564.411 UIKit -[UIViewController _setPresentedStatusBarViewController:]
3 Retain +1 6 00:16.014.324 UIKit -[UIPresentationController runTransitionForCurrentState]
4 Release -1 5 00:16.036.310 UIKit -[UIViewController _setPresentedStatusBarViewController:]
6 Zombie -1 00:18.518.590 UIKit -[UIPresentationController runTransitionForCurrentState]
在简短版本中，似乎Retain实际上正好相反：
1 Retain +1 7 00:14.511.042 UIKit -[UIPresentationController runTransitionForCurrentState]
3 Retain +1 6 00:16.014.324 UIKit -[UIPresentationController runTransitionForCurrentState]
我试图在一个新项目中重现这一点，但无法实现。
此外，似乎只有在我的UIActionSheet委托设置（自己）时才会发生。
此时，我只想向Apple发送更简洁的错误报告，所以我只想确定问题。
更新
可以重现。
当UIActionSheet在一个单独的方法中初始化时，会发生这种情况。 AND 其委托正在呈现另一个ViewController。
exapmle：
@implementation RBCViewController
{
UIActionSheet *actionSheet;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self createActionSheet];
}
- (void)createActionSheet
{
actionSheet = [[UIActionSheet alloc]init];
}
- (IBAction)showActionSheet:(UIButton *)sender {
// Add buttons, assign delegate here
[actionSheet showInView:self.view];
}
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
// Present another ViewContoller here.
// This will fail with 'Bad Access' on the second time
}
答案 0 :(得分：2)
我有同样的问题。解决方案是在每次使用后释放你的UIActionSheet，因为它将保存在它用来呈现自己的UIWindow上（它有一个unsafe_unretained指向你提供的模态VC）。
未来读者：请注意，iOS8发布时可能不再适用。