我试图在我的代码中找到内存泄漏，但不明白问题出在哪里。在我的 iOS 应用程序中，我使用滑动菜单导航模式。导航控制器可以使用滑动菜单进行切换。注销后，应释放所有控制器并释放内存。但是，尽管调用了 dealloc 并且 Instruments 中的引用计数似乎正常，但一些控制器在注销后仍留在内存中。
设置视图控制器
# Category Event Type RefCt Responsible Library Responsible Caller
0 SettingsViewController Malloc 1 MyApp -[SlideViewController didSelectMenuItem:]
1 SettingsViewController Autorelease MyApp -[SlideViewController didSelectMenuItem:]
2 SettingsViewController Retain 2 UIKit -[UIViewController _addChildViewController:performHierarchyCheck:]
3 SettingsViewController Retain 3 UIKit -[UINavigationController topViewController]
4 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
5 SettingsViewController Retain 4 UIKit -[UINavigationController topViewController]
6 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
7 SettingsViewController Release 3 Foundation __NSFireDelayedPerform
8 SettingsViewController Release 2 Foundation __NSFireDelayedPerform
9 SettingsViewController Release 1 Foundation __NSFireDelayedPerform
10 SettingsViewController Retain 2 UIKit -[UINavigationController topViewController]
11 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
12 SettingsViewController Retain 3 UIKit -[UINavigationController topViewController]
13 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
14 SettingsViewController Retain 4 UIKit -[UINavigationController topViewController]
15 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
16 SettingsViewController Retain 5 UIKit -[UINavigationController topViewController]
17 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
18 SettingsViewController Retain 6 UIKit -[UINavigationController topViewController]
19 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
20 SettingsViewController Release 5 GraphicsServices GSEventRunModal
21 SettingsViewController Release 4 GraphicsServices GSEventRunModal
22 SettingsViewController Release 3 GraphicsServices GSEventRunModal
23 SettingsViewController Release 2 GraphicsServices GSEventRunModal
24 SettingsViewController Release 1 GraphicsServices GSEventRunModal
25 SettingsViewController Retain 2 UIKit -[UINavigationController topViewController]
26 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
27 SettingsViewController Retain 3 UIKit -[UINib instantiateWithOwner:options:]
28 SettingsViewController Retain 4 UIKit +[UIProxyObject addMappingFromIdentifier:toObject:forCoder:]
29 SettingsViewController Retain 5 UIKit -[UIProxyObject initWithCoder:]
30 SettingsViewController Retain 6 UIKit -[UIRuntimeConnection initWithCoder:]
31 SettingsViewController Retain 7 UIKit -[UIRuntimeConnection initWithCoder:]
32 SettingsViewController Retain 8 UIKit -[UIRuntimeConnection initWithCoder:]
33 SettingsViewController Retain 9 UIKit -[UIRuntimeConnection initWithCoder:]
34 SettingsViewController Retain 10 UIKit -[UIRuntimeConnection initWithCoder:]
35 SettingsViewController Retain 11 UIKit -[UIRuntimeConnection initWithCoder:]
36 SettingsViewController Retain 12 UIKit -[UIRuntimeConnection initWithCoder:]
37 SettingsViewController Retain 13 UIKit -[UIRuntimeConnection initWithCoder:]
38 SettingsViewController Retain 14 UIKit -[UIRuntimeConnection initWithCoder:]
39 SettingsViewController Retain 15 UIKit -[UIRuntimeConnection initWithCoder:]
40 SettingsViewController Retain 16 UIKit -[UIRuntimeConnection initWithCoder:]
41 SettingsViewController Retain 17 UIKit -[UIRuntimeConnection initWithCoder:]
42 SettingsViewController Retain 18 UIKit -[UIRuntimeConnection initWithCoder:]
43 SettingsViewController Retain 19 UIKit -[UIRuntimeConnection initWithCoder:]
44 SettingsViewController Retain 20 UIKit -[UIRuntimeConnection initWithCoder:]
45 SettingsViewController Retain 21 UIKit UINibDecoderDecodeObjectForValue
46 SettingsViewController Retain 22 UIKit UINibDecoderDecodeObjectForValue
47 SettingsViewController Release 21 UIKit -[UINib instantiateWithOwner:options:]
48 SettingsViewController Release 20 UIKit +[UIProxyObject removeMappingsForCoder:]
49 SettingsViewController Release 19 UIKit -[UIRuntimeConnection dealloc]
50 SettingsViewController Release 18 UIKit -[UIRuntimeConnection dealloc]
51 SettingsViewController Release 17 UIKit -[UIRuntimeConnection dealloc]
52 SettingsViewController Release 16 UIKit -[UIRuntimeConnection dealloc]
53 SettingsViewController Release 15 UIKit -[UIRuntimeConnection dealloc]
54 SettingsViewController Release 14 UIKit -[UIRuntimeConnection dealloc]
55 SettingsViewController Release 13 UIKit -[UIRuntimeConnection dealloc]
56 SettingsViewController Release 12 UIKit -[UIRuntimeConnection dealloc]
57 SettingsViewController Release 11 UIKit -[UIRuntimeConnection dealloc]
58 SettingsViewController Release 10 UIKit -[UINibDecoder finishDecoding]
59 SettingsViewController Release 9 UIKit -[UIRuntimeConnection dealloc]
60 SettingsViewController Release 8 UIKit -[UINibDecoder finishDecoding]
61 SettingsViewController Release 7 UIKit -[UIRuntimeConnection dealloc]
62 SettingsViewController Release 6 UIKit -[UIRuntimeConnection dealloc]
63 SettingsViewController Release 5 UIKit -[UINibDecoder finishDecoding]
64 SettingsViewController Release 4 UIKit -[UIRuntimeConnection dealloc]
65 SettingsViewController Release 3 UIKit -[UIRuntimeConnection dealloc]
66 SettingsViewController Release 2 UIKit -[UIRuntimeConnection dealloc]
67 SettingsViewController Retain 3 UIKit -[UINavigationController topViewController]
68 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
69 SettingsViewController Retain 4 UIKit -[UINavigationController topViewController]
70 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
71 SettingsViewController Retain 5 UIKit -[UINavigationController _startTransition:fromViewController:toViewController:]
72 SettingsViewController Release 4 UIKit -[UINavigationController _startTransition:fromViewController:toViewController:]
73 SettingsViewController Retain 5 UIKit -[UINavigationController topViewController]
74 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
75 SettingsViewController Retain 6 UIKit -[UIResponder becomeFirstResponder]
76 SettingsViewController Release 5 UIKit -[UIResponder becomeFirstResponder]
77 SettingsViewController Retain 6 UIKit -[UINavigationController topViewController]
78 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
79 SettingsViewController Retain 7 UIKit -[UINavigationController topViewController]
80 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
81 SettingsViewController Retain 8 UIKit -[UINavigationController navigationTransitionView:didEndTransition:fromView:toView:]
82 SettingsViewController Release 7 UIKit -[UINavigationController navigationTransitionView:didEndTransition:fromView:toView:]
83 SettingsViewController Retain 8 UIKit -[UINavigationController topViewController]
84 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
85 SettingsViewController Retain 9 UIKit -[UINavigationController topViewController]
86 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
87 SettingsViewController Release 8 UIKit _wrapRunLoopWithAutoreleasePoolHandler
88 SettingsViewController Release 7 UIKit _wrapRunLoopWithAutoreleasePoolHandler
89 SettingsViewController Release 6 UIKit _wrapRunLoopWithAutoreleasePoolHandler
90 SettingsViewController Release 5 UIKit _wrapRunLoopWithAutoreleasePoolHandler
91 SettingsViewController Release 4 UIKit _wrapRunLoopWithAutoreleasePoolHandler
92 SettingsViewController Release 3 UIKit _wrapRunLoopWithAutoreleasePoolHandler
93 SettingsViewController Release 2 UIKit _wrapRunLoopWithAutoreleasePoolHandler
94 SettingsViewController Release 1 UIKit _wrapRunLoopWithAutoreleasePoolHandler
//controller is loaded now
//then logout button will be pressed and the memory should be released
95 SettingsViewController Retain 2 UIKit -[UINavigationController topViewController]
96 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
97 SettingsViewController Release 1 UIKit -[UIViewController _setViewAppearState:isAnimating:]
98 SettingsViewController Retain 2 UIKit -[UINavigationController topViewController]
99 SettingsViewController Autorelease UIKit -[UINavigationController topViewController]
100 SettingsViewController Release 1 UIKit -[UIViewController _setViewAppearState:isAnimating:]
此日志显示最后的引用计数为 1，并且对象没有过度保留。另一个控制器被正确释放。它的仪器日志看起来相同，但在日志末尾还有 2 个额外的调用：
//controller is loaded now
//then logout button will be pressed and the memory should be released
75 SummaryViewController Retain 2 UIKit -[UINavigationController topViewController]
76 SummaryViewController Autorelease UIKit -[UINavigationController topViewController]
77 SummaryViewController Release 1 UIKit -[UIViewController _setViewAppearState:isAnimating:]
78 SummaryViewController Retain 2 UIKit -[UINavigationController topViewController]
79 SummaryViewController Autorelease UIKit -[UINavigationController topViewController]
80 SummaryViewController Release 1 UIKit -[UIViewController _setViewAppearState:isAnimating:]
81 SummaryViewController Release 0 UIKit -[UIViewController dealloc]
82 SummaryViewController Free 0 UIKit -[UIViewController dealloc]
调试显示为两个控制器调用了 dealloc。而且我不明白为什么第一个控制器保留在内存中，但第二个控制器被正确释放。
SettingsViewController 的分配：
self.settingsNavigationController = [[[UINavigationController alloc] initWithRootViewController:[[[SettingsViewController alloc] initWithNibName:@"SettingsViewController" bundle:nil] autorelease]] autorelease];
[self.navigationControllers addObject:_settingsNavigationController];
SummaryViewController 的分配：
self.summaryNavigationController = [[[UINavigationController alloc]
initWithRootViewController:[[[SummaryViewController alloc] initWithNibName:@"SummaryViewController" bundle:nil] autorelease]] autorelease];
[self.navigationControllers addObject:_summaryNavigationController];
SlidingController的Dealloc：
- (void)dealloc
{
[self.navigationControllers removeAllObjects];
self.summaryNavigationController = nil;
self.settingsNavigationController = nil;
self.navigationControllers = nil;
[super dealloc];
}
提前致谢。