Animation code stopped working - xcode

Question

I have animation code in my AppDelegate file thats making the Default.png splashscreen to fade
out to the first controller of the app.
Since I implemented TabBar in my code, the animation stopped working.
Any idea why?
- (void) splashFade
{
splashView = [[UIImageView alloc]
initWithFrame:CGRectMake(0,0, 320, 480)];
splashView.image = [UIImage imageNamed:#"Default.png"];
[_window addSubview:splashView];
[_window bringSubviewToFront:splashView];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:2.0];
[UIView
setAnimationTransition:UIViewAnimationTransitionNone
forView:_window cache:YES];
[UIView setAnimationDelegate:self];
[UIView
setAnimationDidStopSelector:
#selector(startupAnimationDone:finished:context:)];
splashView.alpha = 0.0;
[UIView commitAnimations];
}
- (void)startupAnimationDone:(NSString *)animationID
finished:(NSNumber *)finished
context:(void *)context
{
[splashView removeFromSuperview];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
sleep(2);
[self splashFade];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
UIViewController *viewController1 = [[RootViewController alloc] initWithNibName:#"RootViewController" bundle:nil];
UIViewController *viewController2 = [[TableViewController alloc] initWithNibName:#"TableViewController" bundle:nil];
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1, viewController2, nil];
self.window.rootViewController = self.tabBarController;
[self.window addSubview:self.rootViewController.view];
[self.window addSubview:self.navigationController.view];
[self.window makeKeyAndVisible];
return YES;
}

Answer 1

Try using
[self performSelector:#selector(splashFade) withObject:nil afterDelay:2];
better than sleep(2);