I'd like to override the animation of popToRootViewControllerAnimated: (currently: YES) when a user taps on the same tab bar item that is already selected.
When the tab bar item is first tapped, I check whether the user is signed-in in the viewWillAppear: method of the tab bar item root view controller and if not, immediately push the sign-in controller with animation disabled.
controller.navigationItem.hidesBackButton = YES;
[self.navigationController pushViewController:controller animated:NO];
[controller release];
When the user successfully signs-in, I pop back to the root controller, [animation is] no problem:
[self.navigationController popViewControllerAnimated:YES];
However, the default behavior when tapping the current tab bar item again appears to make the following calls:
-[UITabBarController _tabBarItemClicked:]
which calls
-[UINavigationController popToRootViewControllerAnimated:]
I can't tell if YES is passed into that last one, but assume so based on observation. If the user doesn't sign-in but taps the tab bar item again, it looks like the same [sign-in] controller is getting pushed/popped with animation since the viewDidLoad of the root controller just pushes the sign-in controller again. I'd like the animation to be NO in this one case.
To add to my problems, there are other navigation stacks where the sign-in controller can be pushed and it is appropriate for taps on its tab bar item to pop to the root controller. I have implemented UITabBarControllerDelegate protocol and tabBarController:shouldSelectViewController: in the sign-in controller to check if the tapped bar item root controller is the same and if that controller is the class of the controller I want to special case, but it seems inelegant. Not only that, but now the sign-in controller must know about the class of a controller that could push it onto the navigation stack. While I can keep using the protocol method, there must be a better way to do this.
Thanks for your input and ideas!
