[UIApplication Sharedapplication].keywindow Add view is not valid, solution.

Called in the Viewdidload: method in Rootviewcontroller [[uiapplication sharedapplication ].keywindow Addsubview:]

Invalid discovery

Debug Discovery [uiapplication sharedapplication].keywindow to nil

Because this time appdelegate in the Keywindow has not been created successfully

We can use [[[uiapplication sharedapplication] delegate] window]

Replace

[uiapplication sharedapplication].keywindow

Pro-Test can

This problem is common in iOS7, iOS8 Apple solves this disadvantage.

UIWindow *window = [[[[UIApplication Sharedapplication] delegate] window]

[Window Addsubview:]

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[UIApplication Sharedapplication].keywindow Add view is not valid, solution.