how to change rootviewcontroller of NavigationController?

Question

I have navigationController which is presented as modalview and whose rootviewcontroller is say FirstViewController.At some point I want to change rootviewcontroller of navigationController to SecondViewController.What I did is

[self.navigationController initWithRootViewController:SecondViewController]; 

I am not sure what I did is correct and whether or not FirstViewController got released?Please anyone know what is the correct way of doing this?

Thanks in advance!

Answer 1

Do either

[firstViewController.navigationController setViewControllers: [NSArray arrayWithObject: secondViewController]                                                      animated: YES]; 

or

firstViewController.navigationController.viewControllers = [NSArray arrayWithObject: secondViewController]; 

where firstViewController is an instance of FirstViewController and secondViewController is an instance of SecondViewController classes, respectively. The latter variant is a shortcut for setViewControllers:animated: without animation.

Answer 2

- (void) changeRootViewControllerOFNavigationControlllerAtRuntime:(UIViewController *) viewController {       UINavigationController *navController=[[UINavigationController alloc]initWithRootViewController:viewController];      [UIApplication sharedApplication].delegate.window.rootViewController=navController;  }