Warning: Attempt to present xx on yy whose view is not in the window hierarchy!

阿新 • • 發佈：2019-01-26

編譯xcode的時候報如下警告：

錯誤程式碼

分析

由於呈現模態檢視xx類時，yy檢視的view還沒有被載入到window中。

造成這個原因可能是在yy的viewdidload中呈現xx模態檢視。

解決

把presentModalViewController放到viewDidAppear或者viewWillAppear中

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