(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    sReg = @"no";
    [[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound)];
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];


    // Override point for customization after application launch.
    UIViewController *viewController1 = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
    UIViewController *viewController2 = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
    UIViewController *viewController3 = [[ThirdViewController alloc] initWithNibName:@"ThirdViewController" bundle:nil];
    UIViewController *viewController4 = [[FourthViewController alloc]initWithNibName:@"FourthViewController" bundle:nil];
    UIViewController *viewController5 = [[FifthViewController alloc]initWithNibName:@"FifthViewController" bundle:nil];



    self.tabBarController=[[UITabBarController alloc] init];

    self.tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1, viewController2, viewController3, viewController4,viewController5, nil];
    self.window.rootViewController = self.tabBarController;
    [self.window makeKeyAndVisible];
    return YES;
}

this one of my view controller(FirstViewController):
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self)
    {

        self.title=NSLocalizedString(@"Magnum", @"first");
        self.tabBarItem.image=[UIImage imageNamed:@"magnum"];

    }
    return self;
}