问题
I have a setup where I am presenting a UIPickerViewController (modally) and then some more controllers get pushed on the stack for image editing. If I hit the back button and get to the root view controller , then hit another tab, the app crashes.
This is the crash message:
-[PostPhotoViewController respondsToSelector:]: message sent to deallocated instance 0x19b16a60
I ran Zombies instruments and it looks like the last View Controller (PostPhotoViewController) that was on the stack is getting messages sent to it, even though it has been released. This is happening both on iOS5 and 6, so I am not doing any manual releasing/retaining.
I have set all the outlets to nil PostPhotoVC and unsubscribing from all notifications. The message seems to be coming from the tab bar controller.
Not sure how to stop it, any ideas?
here's the zombies readout:
# Address Category Event Type RefCt Timestamp Size Responsible Library Responsible Caller
0 0x1b730790 PostPhotoViewController Malloc 1 00:19.248.903 256 UIKit -[UIClassSwapper initWithCoder:]
1 0x1b730790 PostPhotoViewController Retain 2 00:19.248.948 0 UIKit UINibDecoderDecodeObjectForValue
2 0x1b730790 PostPhotoViewController Retain 3 00:19.248.998 0 UIKit -[UIRuntimeConnection initWithCoder:]
3 0x1b730790 PostPhotoViewController Retain 4 00:19.249.004 0 UIKit -[UIRuntimeConnection initWithCoder:]
4 0x1b730790 PostPhotoViewController Retain 5 00:19.249.025 0 UIKit -[UIRuntimeConnection initWithCoder:]
5 0x1b730790 PostPhotoViewController Retain 6 00:19.249.030 0 UIKit -[UIRuntimeConnection initWithCoder:]
6 0x1b730790 PostPhotoViewController Retain 7 00:19.249.067 0 UIKit UINibDecoderDecodeObjectForValue
7 0x1b730790 PostPhotoViewController Retain 8 00:19.249.080 0 UIKit UINibDecoderDecodeObjectForValue
8 0x1b730790 PostPhotoViewController Retain 9 00:19.249.648 0 UIKit -[UIStoryboardScene setSceneViewController:]
9 0x1b730790 PostPhotoViewController Retain 10 00:19.249.759 0 UIKit -[UINib instantiateWithOwner:options:]
10 0x1b730790 PostPhotoViewController Release 9 00:19.249.849 0 UIKit -[UINibDecoder finishDecoding]
11 0x1b730790 PostPhotoViewController Release 8 00:19.249.884 0 UIKit -[UINibDecoder finishDecoding]
12 0x1b730790 PostPhotoViewController Release 7 00:19.249.897 0 UIKit -[UINibDecoder finishDecoding]
13 0x1b730790 PostPhotoViewController Release 6 00:19.249.900 0 UIKit -[UINibDecoder finishDecoding]
14 0x1b730790 PostPhotoViewController Release 5 00:19.249.921 0 UIKit -[UIRuntimeConnection dealloc]
15 0x1b730790 PostPhotoViewController Release 4 00:19.249.930 0 UIKit -[UIRuntimeConnection dealloc]
16 0x1b730790 PostPhotoViewController Release 3 00:19.249.936 0 UIKit -[UIRuntimeConnection dealloc]
17 0x1b730790 PostPhotoViewController Release 2 00:19.249.946 0 UIKit -[UIRuntimeConnection dealloc]
18 0x1b730790 PostPhotoViewController Retain 3 00:19.249.998 0 UIKit -[UIStoryboardSegue initWithIdentifier:source:destination:]
19 0x1b730790 PostPhotoViewController Retain 4 00:19.250.010 0 V Nation -[ImageEditViewController prepareForSegue:sender:]
20 0x1b730790 PostPhotoViewController Release 3 00:19.250.018 0 V Nation -[ImageEditViewController prepareForSegue:sender:]
21 0x1b730790 PostPhotoViewController Retain 4 00:19.250.045 0 UIKit -[UIViewController _addChildViewController:performHierarchyCheck:notifyWillMove:]
22 0x1b730790 PostPhotoViewController Release 3 00:19.254.033 0 UIKit -[UIStoryboardSegue dealloc]
23 0x1b730790 PostPhotoViewController Release 2 00:19.254.037 0 UIKit _UIApplicationHandleEvent
24 0x1b730790 PostPhotoViewController Release 1 00:19.254.047 0 UIKit -[UIStoryboardScene dealloc]
25 0x1b730790 PostPhotoViewController Retain 2 00:19.254.119 0 UIKit -[UINavigationController topViewController]
26 0x1b730790 PostPhotoViewController Autorelease 00:19.254.124 0 UIKit -[UINavigationController topViewController]
27 0x1b730790 PostPhotoViewController Retain 3 00:19.254.935 0 UIKit -[UINib instantiateWithOwner:options:]
28 0x1b730790 PostPhotoViewController Retain 4 00:19.254.944 0 UIKit +[UIProxyObject addMappingFromIdentifier:toObject:forCoder:]
29 0x1b730790 PostPhotoViewController Retain 5 00:19.254.950 0 UIKit -[UINib instantiateWithOwner:options:]
30 0x1b730790 PostPhotoViewController Retain 6 00:19.254.957 0 UIKit +[UIProxyObject addMappingFromIdentifier:toObject:forCoder:]
31 0x1b730790 PostPhotoViewController Retain 7 00:19.254.993 0 UIKit -[UIProxyObject initWithCoder:]
32 0x1b730790 PostPhotoViewController Retain 8 00:19.254.994 0 UIKit -[UIRuntimeConnection initWithCoder:]
33 0x1b730790 PostPhotoViewController Retain 9 00:19.255.282 0 UIKit -[UIRuntimeConnection initWithCoder:]
34 0x1b730790 PostPhotoViewController Retain 10 00:19.255.312 0 UIKit -[UIRuntimeConnection initWithCoder:]
35 0x1b730790 PostPhotoViewController Retain 11 00:19.263.971 0 UIKit -[UIProxyObject initWithCoder:]
36 0x1b730790 PostPhotoViewController Retain 12 00:19.263.971 0 UIKit -[UIRuntimeConnection initWithCoder:]
37 0x1b730790 PostPhotoViewController Retain 13 00:19.264.922 0 UIKit UINibDecoderDecodeObjectForValue
38 0x1b730790 PostPhotoViewController Retain 14 00:19.264.924 0 UIKit UINibDecoderDecodeObjectForValue
39 0x1b730790 PostPhotoViewController Retain 15 00:19.264.939 0 UIKit UINibDecoderDecodeObjectForValue
40 0x1b730790 PostPhotoViewController Retain 16 00:19.264.941 0 UIKit UINibDecoderDecodeObjectForValue
41 0x1b730790 PostPhotoViewController Release 15 00:19.265.032 0 UIKit -[UINib instantiateWithOwner:options:]
42 0x1b730790 PostPhotoViewController Release 14 00:19.265.046 0 UIKit +[UIProxyObject removeMappingsForCoder:]
43 0x1b730790 PostPhotoViewController Release 13 00:19.265.049 0 UIKit +[UIProxyObject removeMappingsForCoder:]
44 0x1b730790 PostPhotoViewController Release 12 00:19.265.060 0 UIKit -[UINibDecoder finishDecoding]
45 0x1b730790 PostPhotoViewController Release 11 00:19.265.061 0 UIKit -[UINibDecoder finishDecoding]
46 0x1b730790 PostPhotoViewController Release 10 00:19.265.076 0 UIKit -[UINibDecoder finishDecoding]
47 0x1b730790 PostPhotoViewController Release 9 00:19.265.077 0 UIKit -[UINibDecoder finishDecoding]
48 0x1b730790 PostPhotoViewController Release 8 00:19.265.095 0 UIKit -[UINibDecoder finishDecoding]
49 0x1b730790 PostPhotoViewController Release 7 00:19.265.103 0 UIKit -[UIRuntimeConnection dealloc]
50 0x1b730790 PostPhotoViewController Release 6 00:19.265.109 0 UIKit -[UINibDecoder finishDecoding]
51 0x1b730790 PostPhotoViewController Release 5 00:19.265.118 0 UIKit -[UIRuntimeConnection dealloc]
52 0x1b730790 PostPhotoViewController Release 4 00:19.265.126 0 UIKit -[UIRuntimeConnection dealloc]
53 0x1b730790 PostPhotoViewController Release 3 00:19.265.133 0 UIKit -[UIRuntimeConnection dealloc]
54 0x1b730790 PostPhotoViewController Release 2 00:19.265.548 0 Foundation -[NSAutoreleasePool drain]
55 0x1b730790 PostPhotoViewController Retain 3 00:19.292.511 0 UIKit -[UINavigationController topViewController]
56 0x1b730790 PostPhotoViewController Autorelease 00:19.292.517 0 UIKit -[UINavigationController topViewController]
57 0x1b730790 PostPhotoViewController Retain 4 00:19.297.581 0 UIKit -[UINavigationController topViewController]
58 0x1b730790 PostPhotoViewController Autorelease 00:19.297.585 0 UIKit -[UINavigationController topViewController]
59 0x1b730790 PostPhotoViewController Retain 5 00:19.297.598 0 UIKit -[UINavigationController _startTransition:fromViewController:toViewController:]
60 0x1b730790 PostPhotoViewController Release 4 00:19.297.619 0 UIKit -[UINavigationController _startTransition:fromViewController:toViewController:]
61 0x1b730790 PostPhotoViewController Retain 5 00:19.297.957 0 UIKit -[UINavigationController topViewController]
62 0x1b730790 PostPhotoViewController Autorelease 00:19.297.958 0 UIKit -[UINavigationController topViewController]
63 0x1b730790 PostPhotoViewController Retain 6 00:19.298.000 0 UIKit -[UIResponder becomeFirstResponder]
64 0x1b730790 PostPhotoViewController Release 5 00:19.298.015 0 UIKit -[UIResponder becomeFirstResponder]
65 0x1b730790 PostPhotoViewController Release 4 00:19.302.098 0 QuartzCore CA::AutoreleasePool::~AutoreleasePool()
66 0x1b730790 PostPhotoViewController Release 3 00:19.302.117 0 QuartzCore CA::AutoreleasePool::~AutoreleasePool()
67 0x1b730790 PostPhotoViewController Release 2 00:19.302.696 0 QuartzCore CA::AutoreleasePool::~AutoreleasePool()
68 0x1b730790 PostPhotoViewController Release 1 00:19.303.120 0 QuartzCore CA::AutoreleasePool::~AutoreleasePool()
69 0x1b730790 PostPhotoViewController Retain 2 00:19.651.789 0 UIKit -[UINavigationController topViewController]
70 0x1b730790 PostPhotoViewController Autorelease 00:19.651.789 0 UIKit -[UINavigationController topViewController]
71 0x1b730790 PostPhotoViewController Retain 3 00:19.651.808 0 UIKit -[UINavigationController topViewController]
72 0x1b730790 PostPhotoViewController Autorelease 00:19.651.809 0 UIKit -[UINavigationController topViewController]
73 0x1b730790 PostPhotoViewController Retain 4 00:19.651.854 0 UIKit -[UINavigationController navigationTransitionView:didEndTransition:fromView:toView:]
74 0x1b730790 PostPhotoViewController Release 3 00:19.651.862 0 UIKit -[UINavigationController navigationTransitionView:didEndTransition:fromView:toView:]
75 0x1b730790 PostPhotoViewController Release 2 00:19.651.904 0 GraphicsServices GSEventRunModal
76 0x1b730790 PostPhotoViewController Release 1 00:19.651.905 0 GraphicsServices GSEventRunModal
77 0x1b730790 PostPhotoViewController Retain 2 00:20.841.683 0 UIKit -[UINavigationController topViewController]
78 0x1b730790 PostPhotoViewController Autorelease 00:20.841.684 0 UIKit -[UINavigationController topViewController]
79 0x1b730790 PostPhotoViewController Retain 3 00:20.841.704 0 UIKit -[UINavigationController topViewController]
80 0x1b730790 PostPhotoViewController Autorelease 00:20.841.705 0 UIKit -[UINavigationController topViewController]
81 0x1b730790 PostPhotoViewController Retain 4 00:20.841.706 0 UIKit -[UINavigationController _popViewControllerWithTransition:allowPoppingLast:]
82 0x1b730790 PostPhotoViewController Autorelease 00:20.841.707 0 UIKit -[UINavigationController _popViewControllerWithTransition:allowPoppingLast:]
83 0x1b730790 PostPhotoViewController Retain 5 00:20.841.716 0 UIKit -[UINavigationController setDisappearingViewController:]
84 0x1b730790 PostPhotoViewController Release 4 00:20.841.720 0 UIKit _popViewControllerNormal
85 0x1b730790 PostPhotoViewController Retain 5 00:20.841.732 0 UIKit -[UIViewController removeChildViewController:notifyDidMove:]
86 0x1b730790 PostPhotoViewController Release 4 00:20.841.733 0 UIKit -[UIViewController removeChildViewController:notifyDidMove:]
87 0x1b730790 PostPhotoViewController Release 3 00:20.843.840 0 UIKit _UIApplicationHandleEvent
88 0x1b730790 PostPhotoViewController Release 2 00:20.843.841 0 UIKit _UIApplicationHandleEvent
89 0x1b730790 PostPhotoViewController Release 1 00:20.843.842 0 UIKit _UIApplicationHandleEvent
90 0x1b730790 PostPhotoViewController Retain 2 00:20.844.155 0 UIKit -[UINavigationController _startTransition:fromViewController:toViewController:]
91 0x1b730790 PostPhotoViewController Release 1 00:20.844.178 0 UIKit -[UINavigationController _startTransition:fromViewController:toViewController:]
92 0x1b730790 PostPhotoViewController Retain 2 00:20.845.394 0 UIKit -[UINavigationController navigationTransitionView:didEndTransition:fromView:toView:]
93 0x1b730790 PostPhotoViewController Release 1 00:20.845.396 0 UIKit -[UINavigationController setDisappearingViewController:]
94 0x1b730790 PostPhotoViewController Retain 2 00:20.845.410 0 UIKit -[UINavigationController navigationTransitionView:didEndTransition:fromView:toView:]
95 0x1b730790 PostPhotoViewController Release 1 00:20.845.429 0 UIKit -[UINavigationController navigationTransitionView:didEndTransition:fromView:toView:]
96 0x1b730790 PostPhotoViewController Release 0 00:20.845.437 0 UIKit -[UINavigationController navigationTransitionView:didEndTransition:fromView:toView:]
97 0x1b730790 PostPhotoViewController Zombie -1 00:23.145.572 0 UIKit -[UITabBarController _tabBarItemClicked:]
回答1:
PostPhotoViewController was getting set as the UITabBarController delegate for some reason. removing that fixed things.
来源：https://stackoverflow.com/questions/14927677/view-controller-getting-a-message-sent-to-it-after-release-causes-a-crash