UIActionSheet 访问错误，UIPresentationController 僵尸

Posted 2023-03-08

【中文标题】UIActionSheet 访问错误，UIPresentationController 僵尸

【英文标题】：UIActionSheet bad access, UIPresentationController zombie

【发布时间】：2014-07-05 05:31:04

【问题描述】：

在 ios 8 中测试应用时，ActionSheet 因访问不当而不断崩溃。 （Xcode 6 beta 2，iOS 8 模拟器）

这里有一个相关的帖子：UIActionSheet crash in iOS8beta

仪器确实捕获了与UIPresentationController 相关的僵尸。我不确定我的阅读是否正确，但保留计数似乎从 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（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]

在简短的版本中，似乎 Retain 实际上做了相反的事情：

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，但没有成功。

另外，似乎只在我的 UIActionSheet 委托设置（自我）时发生。

此时，我只想向 Apple 发送一份更简洁的错误报告，所以我只是想找出问题所在。

---

更新

---

可以复制。

当UIActionSheet 是在一个单独的方法中初始化时，就会发生这种情况。 并且它的委托正在呈现另一个 ViewController。

例如：

@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

【问题讨论】：

beta 3 是否发生同样的情况

@Dont_Peep 是的。我没有费心提及它，但我使用的是 Xcode 6 Beta 3。我向 Apple 报告并被要求提供更多信息，我更新了这些信息。我花了一些时间把它从一个大项目中分离出来。

【参考方案1】：

我有同样的问题。解决方案是在每次使用后释放你的 UIActionSheet，因为它会保留它用来呈现自身的 UIWindow（它有一个指向你呈现的模态 VC 的 unsafe_unretained 指针）。

未来的读者：当心，iOS8 发布后可能不再适用。

【讨论】：

好电话！我们必须密切关注即将发生的变化。