崩溃:"Auto Layout still required after executing -layoutSubviews."

当把一个自定义的view，加到viewcontroller的view中显示时，有时出现崩溃现象。

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Auto Layout still required after executing -layoutSubviews. XXXview'simplementation of -layoutSubviews needs to call super.'

解决办法：

-(void)layoutSubviews
{  
 //控件的frame变化逻辑
    ...  

  [super layoutSubviews];  //把父类的layoutSubviews方法实现在最后，就可以解决这个问题。
}