Warning: Attempt to present on whose view is not in the window hierarchy!,attempthierarchy

來源:互聯網
上載者:User

Warning: Attempt to present on whose view is not in the window hierarchy!,attempthierarchy

當我想從一個VC跳轉到另一個VC的時候,一般會用

- (void)presentViewController:(UIViewController *)viewControllerToPresent animated: (BOOL)flag completion:(void (^)(void))completion;當然也可以用導航push。

有時會遇到了此類警告:Warning: Attempt to present on whose view is not in the window hierarchy!

原因:頁面跳轉必須在viewDidLoad和viewDidAppear之後才能進行。

解決辦法:必須確保頁面跳轉要在view load完畢之後進行。

第一種:通過延時來等待view Load執行結束,但是這個方法在時間上不好把握

第二種:在viewDidLoad裡用

 [selfperformSelectorOnMainThread:@selector(login)withObject:nilwaitUntilDone:NO];

把頁面跳轉的代碼寫進函數裡,然後將 waitUntilDone 設為NO

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