self.title = @"My View";

navigationBar.topItem.title = @"My View";

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
     if(self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
             self.title = @"My Title";
     }
     return self;
}

- (void)applicationDidFinishLaunching:(UIApplication *)application {
    UIViewController *myCustomViewController = [[MyCustomViewController alloc] init];
    navController = [[UINavigationController alloc] initWithRootViewController:myCustomViewController];
    [window addSubview:navController.view];
    [window makeKeyAndVisible];
}

- (void)viewDidLoad {
    self.title = @"Hello World!";
}