*** Assertion failure in void UIViewReportBrokenSuperviewChain(UIView *__strong, UIView *__strong, BOOL)()

*** Assertion failure in void UIViewReportBrokenSuperviewChain(UIView *__strong, UIView *__strong, BOOL)(), /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit/UIKit-3600.7.47/UIView.m:189

[Bugly]  Trapped uncaught exception 'NSInternalInconsistencyException', reason: 'View has lost track of its superview, most likely through unsupported use of CALayer API on the view's layer. If this isn't a crash yet, it will be in the near future.

之前遇到了这个报错，是在返回上一个控制器时发生的，经过排查发现造成这个报错的原因：

先创建了一个UIView A放在viewController.view上，又在viewA上添加了layer，然后在离开控制器时崩掉了，崩溃的原因是带有layer的viewA的父视图比viewA先移除，从上面的报错 View has lost track of its superview 也能看出。可以在viewWillDisappear时先把viewA移除，或者是在带layer的视图的父视图移除前，现将带layer的视图移除，就可以解决。

遇到这个问题，可以先从自己的代码中有操作过layer的部分开始。