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。
错误代码
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。
错误代码 Warning: Attempt to present xx on yy whose view is n...
报错：Warning: Attempt to present < UINavigationController: ...
Warning: Attempt to present on
错误信息 Warning: Attempt to present on which is already ...
1.Warning: Attempt to present on whose view is not in t...
Warning: Attempt to present
警告：Warning: Attempt to present
报错 Warning: Attempt to present
1、错误：Warning: Attempt to present
Warning: Attempt to present on
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