Programmatically create tabBarController in appdelegate - ios

Question

I've been following lot's of different tutorials on how to add a UITabBarController programmatically. This would be easy to achieve using storyboard, but since I'm trying to learn how to do things programmatically I can't do that.
At the moment I've got this code in the didFinishLaunchingWithOptions.
tabBarController = [[UITabBarController alloc] init];
NSMutableArray *tabs = [[NSMutableArray alloc] init];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:[[MenuViewController alloc] init]];
[tabBarController setViewControllers:tabs];
[tabs addObject:navController];
[self.window addSubview:tabBarController.view];
Edited code:
tabBarController = [[UITabBarController alloc] init];
MenuViewController *firstTab = [[MenuViewController alloc] initWithNibName:#"MenuViewController" bundle:nil];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:firstTab];
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = #[navController];
[self.window setRootViewController:tabBarController];
[self.window makeKeyAndVisible];
This does not do anything to my rootViewController called MenuViewController. How can I achieve this?

Answer 1

Thie bellow code for 5 tab UITabbarcontroller try with this bellow code:-
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
anasayfaViewController * firstTab= [[anasayfaViewController alloc] initWithNibName:#"anasayfaViewController" bundle:nil];
UINavigationController *navigationController1 = [[UINavigationController alloc] initWithRootViewController:firstTab];
SehirRehberiViewController *sehirRehberi = [[SehirRehberiViewController alloc] initWithNibName:#"SehirRehberiViewController" bundle:nil];
UINavigationController *navigationController2 = [[UINavigationController alloc] initWithRootViewController:sehirRehberi];
duyuruViewController *duyuru = [[duyuruViewController alloc] initWithNibName:#"duyuruViewController" bundle:nil];
UINavigationController *navigationController3 = [[UINavigationController alloc] initWithRootViewController:duyuru];
sikayetViewController *sikayet = [[sikayetViewController alloc] initWithNibName:#"sikayetViewController" bundle:nil];
UINavigationController *navigationController4 = [[UINavigationController alloc] initWithRootViewController:sikayet];
digerViewController *diger = [[digerViewController alloc] initWithNibName:#"digerViewController" bundle:nil];
UINavigationController *navigationController5 = [[UINavigationController alloc] initWithRootViewController:diger];
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = #[navigationController1,navigationController2,navigationController3,navigationController4,navigationController5];
[self.window setRootViewController:tabBarController];
[self.window makeKeyAndVisible];

Answer 2

You should add tab bar controller as a root view controller:
[self.window setRootViewController:tabBarController];
also it's a good idea to first add object to array and after that do something with it, (other way round):
[tabs addObject:navController];
[tabBarController setViewControllers:tabs];

Answer 3

UIViewController *viewController_favorites = [[[FavoritesViewController alloc] initWithNibName:#"FavoritesViewController" bundle:nil] autorelease];
UIViewController *viewController_project = [[[ProjectViewController alloc] initWithNibName:#"ProjectViewController" bundle:nil] autorelease];
UIViewController *viewController_search = [[[Search alloc] initWithNibName:#"Search" bundle:nil] autorelease];
UIViewController *viewController_setting = [[[SettingViewController alloc] initWithNibName:#"SettingViewController" bundle:nil] autorelease];
UINavigationController *navController_favorite = [[[UINavigationController alloc] initWithRootViewController:viewController_favorites] autorelease];
UINavigationController *navController_project = [[[UINavigationController alloc] initWithRootViewController:viewController_project] autorelease];
UINavigationController *navController_search = [[[UINavigationController alloc] initWithRootViewController:viewController_search] autorelease];
self.tabBarController = [[[UITabBarController alloc] init] autorelease];
self.tabBarController.viewControllers = [NSArray arrayWithObjects:navController_favorite,navController_project,navController_search,viewController_setting, nil];
self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];

Answer 4

If you want to have a UITabBarController as your app's rootViewcontroller you can add this code to the didFinishLaunchingWithOptions function.
It adds a navigation controller containing a list controller and a simple view controller:
- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions
{
UITabBarController* tabBarController = [[UITabBarController alloc] init];
UITableViewController* myListController = [[MyListController alloc] init];
UINavigationController* navigationControllerMyList = [[UINavigationController alloc] initWithRootViewController:myListController];
navigationControllerMyList.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:0];
UIViewController* simpleViewController = [[SimpleViewController alloc] init];
simpleViewController.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemContacts tag:0];
tabBarController.viewControllers = #[ navigationControllerMyList , simpleViewController ];
self.window = [[UIWindow alloc] init];
self.window.rootViewController = tabBarController;
[self.window makeKeyAndVisible];
return YES;
}