iOS Switch between UIViewController and UINavigationController

[edcruise]

Hi at all,
i've a question about UIViewController and UINavigationController.

I'm working on an application in which I have a login view (through UIViewController) and other 3 view stacked on UINavigationController.

I want to distinguish between LoginView and the other view, then I adopted this solution...mainly because if I use IUNavigationController, after login I can go back using back button from UINavigationBar....I dont want that it happens.

My solution is to create a UIViewController for LoginView....then if login is ok, create UINavigationController and add it to subview. In second access, if I found that user already login, go directly to UINavigationController.
But I have wrong view loaded...and the application gets an error.

here that I have:

app delegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
    [self.window addSubview:loginViewController.view];
    [self.window makeKeyAndVisible];	
    return YES;
}

LoginViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    if (!logged) {
	// do login process 
    }
    HomeController *hController = [[HomeController alloc] initWithNibName:@"HomeView" bundle:nil];		
    UINavigationController *nc = [[UINavigationController alloc] initWithRootViewController:hController];
    [hController release];
		
    [self.view addSubview: nc.view];
    [self presentModalViewController:nc animated:YES];
    [nc release];
}

On starting app first is loaded LoginViewController (UIViewController), it decides if user is logged in or not...then create UINavigationController with LoginViewController as root controller. But I get some displaying error, NavigationController on top of LoginController but all is blocked.

Where am I wrong ? Is it not possible to call programmatically a UINavigationController from UIViewController after loaded ?

Thanks in advance.
edcruise

 

[cwalcott]

If you want to replace the login view with the UINavigationController, then you should remove it from the window, then add the nav controller.

UIWindow *mainWindow = self.view.window;
[self.view removeFromSuperview];
[mainWindow addSubview:nc.view];