[UIPageViewController _sendChildViewWill：出现：动画：] + 290
我的应用程序的堆栈跟踪中没有任何内容。造成这次崩溃的原因是什么？
0
libobjc.A.dylib
objc_msgSend + 5
countByEnumeratingWithState:objects:count:
1
UIKit
-[UIPageViewController _sendChildViewWill:appear:animated:] + 290
2
UIKit
-[UIPageViewController viewDidAppear:] + 68
3
UIKit
-[UIViewController _setViewAppearState:isAnimating:] + 410
4
CoreFoundation
__53-[__NSArrayI enumerateObjectsWithOptions:usingBlock:]_block_invoke + 52
5
CoreFoundation
-[__NSArrayI enumerateObjectsWithOptions:usingBlock:] + 220
6
UIKit
-[UIViewController _setViewAppearState:isAnimating:] + 724
7
UIKit
-[UIViewController _endAppearanceTransition:] + 264
8
UIKit
-[UIWindowController transitionViewDidComplete:fromView:toView:removeFromView:] + 1714
9
UIKit
__101-[UIWindowController transition:fromViewController:toViewController:target:didEndSelector:animation:]_block_invoke293 + 170
10
UIKit
-[_UIViewControllerTransitionContext completeTransition:] + 74
11
UIKit
-[UITransitionView notifyDidCompleteTransition:] + 288
12
UIKit
-[UITransitionView _didCompleteTransition:] + 944
13
UIKit
-[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 178
14
UIKit
-[UIViewAnimationState animationDidStop:finished:] + 70
15
QuartzCore
CA::Layer::run_animation_callbacks(void*) + 232
16 libdispatch.dylib
_dispatch_client_callout + 22
23 UIKit
UIApplicationMain + 1136
24
main.m line 14