viewDidLoad getting called twice on rootViewController at launch

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I had this same issue when my app was first launching. What I found was that in my MainWindow.xib file, I was setting both my App Delegate’s viewController outlet, and my Window’s rootViewController outlet to my root view controller. When you build a View Based project file in Xcode, your App Delegate’s didFinishLaunchingWithOptions will be pre-populated with:

self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;

I believe that the self.viewController ivar is instantiated from MainWindow.xib before didFinishLaunchingWithOptions gets called. Then the pre-populated code above sets the Window’s rootViewController. So if, in conjunction, you specify the rootViewController outlet for the Window in your MainWindow.xib file, your root view controller will actually be created twice and added as the Window’s root view controller two times.

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