Here is my code:

SignupController* signupController = [[SignupController alloc] initWithNibName:@"SignupController" bundle:nil];
    [window addSubview:[navigationController view]];
    [window makeKeyAndVisible];

    self.navigationController.title = @"MyNavController";

    [self.navigationController pushViewController:signupController animated:YES];
    [signupController release];

Unfortunately for me calling pushViewController is not synchronous, so the next line ([signupController release]) is executed immediately.

I need to detect hen the signupController has popped back to the root so I can take the data from the signup controller and do a registration or login.

Any ideas?

Thanks