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layoutSublayersOfLayer中调用> [self.view layoutSubviews];

- (void)layoutSublayersOfLayer:(CALayer *)layer {

    [self layoutSubviews];

}

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