Add Navigation Controller

-Take a window based project.Open AppDelegate.h file and            

-Write this code to interface.

UINavigationController     *navController;

-Before the @end write the property. 

@property (nonatomic, retain) IBOutlet UINavigationController *navController;

-Synthesize to implementation file.

@synthesize navController

-Now write the code to application didFinishLaunchingWithOptions

         iBlowViewController *mainViewController = [[iBlowViewController alloc] initWithNibName:@"iBlowViewController" bundle:nil];

         UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:mainViewController];

         self.navController = navigationController;

         [navigationController release];

        

// Configure and display the window.

         [window addSubview:navController.view];

         [window makeKeyAndVisible];