Question

I wanted to add a navigation controller to a view based application . how can we do this both programmatically and using xib file..

Answer 1

If you need to incorporate a navigation controller in your uiviewcontroller you need to initialize it as it follows

UIViewController *yourViewController = ...

UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:yourViewController];

[self presentModalViewController:navController animated:YES];

//you need to release the controller
[navController release];

If you are in the UIApplicationDelegate method

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

You can’t do a presentModalViewController:navController animated… then you need to add the navController.view to the window

    UIViewController *yourViewController = ...

    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:yourViewController];
    [self.window addSubview:navController.view];
    //don't do a release of navController because is not retained by addSubview