解决问题:Assertion failure in -[UIView layoutSublayersOfLayer:], /SourceCache/UIKit/UIKit-2935.137/UIVie

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今天遇到一个问题:

现象:

代码在simulator上能够正常运行但是在真机上出现

 Assertion failure in -[UIView layoutSublayersOfLayer:], /SourceCache/UIKit/UIKit-2935.137/UIView.m:8803\

(ios7系统)

\

解决方法: 

在viewDidLayoutSubviews结尾调用: [self.view layoutIfNeeded];\