application: didFinishLaunchingWithOptions doesn't execute, but RootViewController: viewDidLoad does, how is this possible?

I'm playing around with the iPad SplitView template and it was working fine before I started swapping out view objects in my RootViewController. When it was working fine, the application:didFinishLaunchingWithOptions method would be called and would setup my persistant store objects, then the RootViewController:viewDidLoad method would be called to populate my rootView with data from my store. I opened up IB and started swapping out view objects in my RootView and now the application:didFinishLaunchingWithOptions method never gets called, but the RootViewController:viewDidLoad method still does. Obviously, the app crashes because the viewDidLoad method depends on the successful execution of the didFinishLauchingWIthOptions method to setup the persistent store objects. Does anyone have any thoughts on what is causing this or how I can go about investigating what's causing this?

I'm obviously new to iPhone OS development, so I apologize if this questions is absurd in any way. 开发者_JAVA技巧 Thanks so much in advance for your help!

This is propabaly caused by the fact that in MainWindow.xib, your application delegate object is not connected to File's Owner (UIApplication). You can open the MainWindow.xib and right click on your App Delegate to see if it has a connection in Referencing Outlet to File's Owner. If not, set it to. And this will fix your problem.

-viewDidLoad is not called from -application:didFinishLaunchingWithOptions:. They are independent. The call hierarchy could be summarized as:

1. load app; call -application:didFinishLaunchingWithOptions:
2. window is visible, load views of view controllers.
3. call -viewDidLoad.