xcode编译Warning: Attempt to present xx on yy whose view is not in the window hierarchy!
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本文原始地址：xcode编译Warning:
编译xcode的时候报如下警告：
错误代码
Warning: Attempt to present xx on yy whose view is not in the window hierarchy!
分析
由于呈现模态视图xx类时，yy视图的view还没有被加载到window中。
造成这个原因可能是在yy的viewdidload中呈现xx模态视图。
解决
把presentModalViewController放到viewDidAppear或者viewWillAppear中。
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