Present UIAlertController from AppDelegate [duplicate]

Answer 1

you call it before the window is up and the navigationController is actually shown:

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

likely you do so in applicationDidFinishLaunching?

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EITHER wait .. like do it when the view really appears

OR

one 'hack' would be to force the view and window up yourself:

[self.window addSubview:self.rootViewController.view];
[self.window makeKeyAndVisible];