#iOS: Nib-less Tab Bar Controller setup

main.m

//...

int main(int argc, char *argv[])
{
        // Add App Delegate class name as forth argument in UIApplicationMain()
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
	int retVal = UIApplicationMain(argc, argv, nil, @"TestAppDelegate");
	[pool release];
	return retVal;
}

//...

TestAppDelegate.m

//...

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
	// Override point for customization after application launch.

        // Create a new window and assign directly to provided iVar
	_window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

        // Set background for window if desired
	[self.window setBackgroundColor:[UIColor whiteColor]];
	
	UITabBarController *tbc = [[UITabBarController alloc] initWithNibName:nil bundle:nil];
	NSMutableArray *controllers = [NSMutableArray arrayWithCapacity:0];
	
	for (int index = 0; index < 4; index ++)
	{
		NSString *title = [NSString stringWithFormat:@"Controller %d", index];
		
                // Replace with custom controllers for all desired tabs
		UIViewController *controller = [[UIViewController alloc] initWithNibName:nil bundle:nil];
		[controller setTitle:title];
		
		UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:controller];
		[controller release];
		
                // Tag, title and apply images as desired
		UITabBarItem *item = [[UITabBarItem alloc] initWithTitle:title image:nil tag:index * 1000];
		[nav setTabBarItem:item];
		[item release];
		
		[controllers addObject:nav];
		[nav release];	
	}
	
        // Assign controller to tab bar controller
	[tbc setViewControllers:controllers];
	
        // Set tab bar controller as root view controller
	[self.window setRootViewController:tbc];
        [tbc release];

	[self.window makeKeyAndVisible];
    return YES;
}

//...