最近我的应用在生产环境中崩溃了，但是无法在调试模式下重现此错误。
Crashlytics 报告的错误信息如下：
UIKit
-[UIViewController viewDidMoveToWindow:shouldAppearOrDisappear:]
SIGABRT ABORT 0x00000001825d4d74
Crashed: com.apple.main-thread
0 libsystem_kernel.dylib 0x1825d4d74 __abort_with_payload + 8
1 libsystem_kernel.dylib 0x1825d1480 abort_with_payload_wrapper_internal + 100
2 libsystem_kernel.dylib 0x1825d141c abort_with_payload_wrapper_internal + 34
3 libobjc.A.dylib 0x18203fed8 _objc_fatalv(unsigned long long, unsigned long long, char const*, char*) + 112
4 libobjc.A.dylib 0x18203fe30 __objc_error + 42
5 libobjc.A.dylib 0x182052cd4 weak_entry_insert(weak_table_t*, weak_entry_t*) + 318
6 libobjc.A.dylib 0x182058664 objc_initWeak + 324
7 UIKit 0x1894ce1bc -[UIViewController viewDidMoveToWindow:shouldAppearOrDisappear:] + 2068
8 UIKit 0x18944db5c -[UIView(Internal) _didMoveFromWindow:toWindow:] + 1352
9 UIKit 0x18944d8e4 -[UIView(Internal) _didMoveFromWindow:toWindow:] + 720
10 UIKit 0x189471714 -[UIScrollView _didMoveFromWindow:toWindow:] + 92
11 UIKit 0x18944d8e4 -[UIView(Internal) _didMoveFromWindow:toWindow:] + 720
12 UIKit 0x18944d8e4 -[UIView(Internal) _didMoveFromWindow:toWindow:] + 720
13 UIKit 0x189471714 -[UIScrollView _didMoveFromWindow:toWindow:] + 92
14 UIKit 0x18944d8e4 -[UIView(Internal) _didMoveFromWindow:toWindow:] + 720
15 UIKit 0x18944d8e4 -[UIView(Internal) _didMoveFromWindow:toWindow:] + 720
16 UIKit 0x18944d8e4 -[UIView(Internal) _didMoveFromWindow:toWindow:] + 720
17 UIKit 0x18944d8e4 -[UIView(Internal) _didMoveFromWindow:toWindow:] + 720
18 UIKit 0x18944d8e4 -[UIView(Internal) _didMoveFromWindow:toWindow:] + 720
19 UIKit 0x18944d8e4 -[UIView(Internal) _didMoveFromWindow:toWindow:] + 720
20 UIKit 0x18944d8e4 -[UIView(Internal) _didMoveFromWindow:toWindow:] + 720
21 UIKit 0x18944d8e4 -[UIView(Internal) _didMoveFromWindow:toWindow:] + 720
22 UIKit 0x18944cd90 __45-[UIView(Hierarchy) _postMovedFromSuperview:]_block_invoke + 156
23 Foundation 0x184034510 -[NSISEngine withBehaviors:performModifications:] + 168
24 UIKit 0x18944cc04 -[UIView(Hierarchy) _postMovedFromSuperview:] + 820
25 UIKit 0x18974a078 __UIViewWasRemovedFromSuperview + 172
26 UIKit 0x18944bc80 -[UIView(Hierarchy) removeFromSuperview] + 512
27 UIKit 0x1897a23dc __71-[UIPresentationController _initViewHierarchyForPresentationSuperview:]_block_invoke.629 + 1044
28 UIKit 0x18979c4fc -[UIPresentationController transitionDidFinish:] + 124
29 UIKit 0x18990afc8 -[_UICurrentContextPresentationController transitionDidFinish:] + 40
30 UIKit 0x1897a012c __56-[UIPresentationController runTransitionForCurrentState]_block_invoke_2 + 188
31 UIKit 0x189578ad4 -[_UIViewControllerTransitionContext completeTransition:] + 116
32 UIKit 0x1895788c0 -[UITransitionView notifyDidCompleteTransition:] + 252
33 UIKit 0x1895783dc -[UITransitionView _didCompleteTransition:] + 1240
34 UIKit 0x189577ef0 -[UITransitionView _transitionDidStop:finished:] + 124
35 UIKit 0x189489b48 -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 312
36 UIKit 0x189489988 -[UIViewAnimationState animationDidStop:finished:] + 160
37 QuartzCore 0x186912404 CA::Layer::run_animation_callbacks(void*) + 260
38 libdispatch.dylib 0x1824911c0 _dispatch_client_callout + 16
39 libdispatch.dylib 0x182495d6c _dispatch_main_queue_callback_4CF + 1000
40 CoreFoundation 0x1835b5f2c __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
41 CoreFoundation 0x1835b3b18 __CFRunLoopRun + 1660
42 CoreFoundation 0x1834e2048 CFRunLoopRunSpecific + 444
43 GraphicsServices 0x184f65198 GSEventRunModal + 180
44 UIKit 0x1894bc628 -[UIApplication _run] + 684
45 UIKit 0x1894b7360 UIApplicationMain + 208
46 <App Name> 0x100081590 main (main.m:14)
47 libdispatch.dylib 0x1824c45b8 (Missing)
大多数日志显示用户的RAM内存空闲率在1%至3%之间，但有些超过了10%。
此外，我的应用程序使用Sentry跟踪错误，但这个错误不在Sentry中，只在Fabric中出现。
我的大多数用户使用iOS 10，但仍然有一些使用iOS 9，这个崩溃似乎不影响这些用户。所以它似乎与iOS 10有关。
我已经在这里搜索过了，但是我没有找到解决方案，甚至线索。有人可以帮我找到线索吗？
编辑：
关于评论所提到的与UIViewController相关的新代码是：
- (IBAction)tapClose:(id)sender {
[self close];
}
- (void)close {
_dismissing = YES;
CGFloat height = self.view.superview.frame.size.height;
[UIView animateWithDuration:0.2 animations:^{
[self.view setFrame:CGRectMake(0, height, self.view.frame.size.width, self.view.frame.size.height)];
_overlay.alpha = 0;
} completion:^(BOOL finished) {
if (finished) {
[self.view removeFromSuperview];
[_overlay removeFromSuperview];
if (self.blockWhenClose) {
self.blockWhenClose();
}
}
}];
}
- (void)showIn:(UIViewController *)viewcontroller {
CGRect frame = viewcontroller.view.frame;
CGFloat height = [self calculateHeight:frame.size.height / 2];
[self.view setFrame:CGRectMake(0, frame.size.height, frame.size.width, height)];
[_overlay setFrame:frame];
_overlay.alpha = 0;
[viewcontroller addChildViewController:self];
[viewcontroller.view addSubview:_overlay];
[viewcontroller.view addSubview:self.view];
[self didMoveToParentViewController:viewcontroller];
[UIView animateWithDuration:_duration animations:^{
_overlay.alpha = 1;
[self.view setFrame:CGRectMake(0, frame.size.height - height, frame.size.width, height)];
}];
_show = YES;
}
但是我不知道崩溃发生的确切位置。
_UIViewControllerTransitionContext意味着在切换UIViewController之间发生。您是否正在使用类似于“侧边菜单”控制器或执行自定义的UIViewControllerAnimation？ - KrishnaCA无法形成对类<class name>实例（0x1093ae3c0）的弱引用。可能是该对象被过度释放或正在进行解除分配的过程。因为视图控制器位于分页视图中。我可以通过快速切换页面来重现它。在我的情况下，当创建自定义视图时，问题发生在tableView:viewForHeaderInSection:。希望这能帮到你。 - Alberto Cantallops