Best practice for ownership of a UINavigationController in a navigation based app?

My small app is growing more sprawling and I'm looking for some best practice advice on the management/ownership of view controllers and navigation controllers.

Here's what I'm doing now:

1. AppController is a singleton that creates and owns a UINavigationController instance. The app controller, and thus the navigation controller, can be globally accessed via a +sharedController like method.

2. Every view controller in the app that wishes to push a new view controller, basically does this:

   NextViewController * nextViewController = [[NextViewController alloc] init]; [[[AppController sharedController] navigation] pushViewController:nextViewController ...]; [nextViewController release];

In this way, all "leaf" views are responsible for creating the next view over and pushing it, and the navigation controller lives in one place that everyone can get to.

But I cooked this up myself. Since navigation through view controllers is such a critical piece of architecture, I'm wondering if anyone has a better o开发者_Go百科r more thoughtful approach here.

Thanks.

Every view controller has a navigationController property. If the UIViewController is part of a navigation stack, this property is set so you can grab a reference to the UINavigationController. So, instead of having to reference the AppController (or perhaps even having one at all - you can just put this in the AppDelegate), you can just do something like this:

NextViewController * nextViewController = [[NextViewController alloc] init];
[self.navigationController pushViewController:nextViewController ...];
[nextViewController release];

Why not use self.navigationController in those views that need to push? The only thing you need to do in the AppController is push the initial view on the navigation controller.