控制UINavigationController跳转的方法

原作者：Lin

After a lot of trial and mistakes, finally I kinda figured out how to make UINavigationController work…
1. initialise
To initialise:
1.1. with a default root controller:
self.controller = [mainController getInstance]; 
self.nav = [[UINavigationController alloc] 
initWithRootViewController:self.controller];
1.2. without a default root controller
self.nav = [[UINavigationController alloc] init];
2. push in a view
self.controller = [view1Controller getInstance];
[self.nav 
pushViewController: self.controller 
animated:YES];
NOTE: do NOT release self.controller here, as the nav controller will release it when it needs to do so, already tested - the pop view method will release it.
NOTE 2: I am using a getInstance function here to ensure each new controller is a singleton, otherwise, each time a new object is instantiated and taken one memory space.
3. pop out a view and go back a level
simply:
[self.nav popViewControllerAnimated:YES]
4. Go back to top level
[self.nav popToRootViewControllerAnimated: YES];
5. go to any level you like
Theoritically, this should be as simple as UINavigationController::pushViewController(controller instance), but it’s not yet tested
Now, to get the nav controller from within the controllers pushed to the nav controller stack, simly go
[thePushedInController navigationController];
To get an array of all controllers loaded into the nav controller:
[nav controllers];

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