iOS: UINavigationController

// in app delegate .m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

    // Override point for customization after application launch.

    self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];

    

    //NEW - start

    UINavigationController *nc = [[UINavigationController alloc] initWithRootViewController:self.viewController];

    self.window.rootViewController = nc;

    [nc release];

    // end

    [self.window makeKeyAndVisible];

    return YES;

}

// in viewcontroller .m ; assume IBAction to a button to click to go to another VC

-(IBAction) m1:(id)sender

{

    NSLog(@"about us");
    // NEW: create VC instance and push into nav controller

    AboutVC *about = [[AboutVC alloc] initWithNibName:@"AboutVC" bundle:nil];

    [self.navigationController pushViewController:about animated:YES];

}

// in AboutVC.m

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view from its nib.
    // NEW: set title on title bar of nav controller

    [self setTitle:@"About Us"];

}