iOS: UITabBarController

// in root view controller .m

- (void)viewDidLoad

{

    [super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

    UITabBarController *tbc = [[UITabBarController alloc] init];

    

    // create VC instances

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

    ContactVC *cvc = [[ContactVC alloc] initWithNibName:@"ContactVC" bundle:nil];

    

    // set tab bar properties if necessary. use system defined tab if necessary

    UITabBarItem *tbitem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:1];

    // link VC to this tab bar item

    [cvc setTabBarItem:tbitem];

    

    // interesting that if title is set in VC, it overrides the title here

    UITabBarItem *tbitem2 = [[UITabBarItem alloc] initWithTitle:@"Hmm" image:[UIImage imageNamed:@"myimage.gif"] tag:2];

    // link VC to this tab bar item

    [avc setTabBarItem:tbitem2];

    

    // create array storing all the VCs

    NSArray *arr = [NSArray arrayWithObjects:avc, cvc, nil] ;

    

    // link array to tab bar controller. if title is set in VC, it will show in tab bar

    [tbc setViewControllers:arr];

    

    // set the view bounds of tab bar

    [tbc.view setFrame:self.view.bounds];

    

    // add tab bar to current view

    [self.view addSubview:tbc.view];

}