How to add NavigationController into Tabbed Based Application in iOS - uinavigationcontroller

Question

I'm using Xcode 4.4.1. I have created a simple tabbed based application. And then I want to add navigation controller to the application. Can any one tell me how to do that in Xcode 4.4.1. My current code is like this but it doesn't work.
`
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
UIViewController *viewController1 = [[FirstViewController alloc] initWithNibName:#"FirstViewController" bundle:nil];
UIViewController *viewController2 = [[Addbills alloc]initWithNibName:#"Addbills" bundle:nil];
UIViewController *viewController3 = [[CalenderView alloc]initWithNibName:#"CalenderView" bundle:nil];
UIViewController *viewController4 = [[Web alloc]initWithNibName:#"Web" bundle:nil];
UIViewController *viewController5 = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.navigationController = [[UINavigationController alloc] initWithRootViewController:viewController1];
[self.navigationController setNavigationBarHidden:TRUE];
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = #[viewController1,viewController2,viewController3,viewController4,viewController5];
self.window.rootViewController = self.tabBarController;
// self.window.rootViewController =self.navigationController;
[self.window addSubview:navigationController.view];
[self.window makeKeyAndVisible];
return YES;
}
`
and this is my button click event in viewController5
`
- (IBAction)backToPrevious:(id)sender {
[self.navigationController popToRootViewControllerAnimated:TRUE];
}`
Thanks,

Answer 1

Here is how you should do it.
// initialize the tabbar controller
UITabBarController *tabbarController = [[[UITabBarController alloc] init] autorelease];
UIViewController *itemsViewController1 = [[[UIViewController alloc] initWithNibName:#"SomeViewController1" bundle:nil] autorelease];
UINavigationController *itemsNavigationController1 = [[UINavigationController alloc] initWithRootViewController:itemsViewController1];
UIViewController *itemsViewController2 = [[[UIViewController alloc] initWithNibName:#"SomeViewController2" bundle:nil] autorelease];
UINavigationController *itemsNavigationController2 = [[UINavigationController alloc] initWithRootViewController:itemsViewController2];
tabbarController.viewControllers = #[itemsNavigationController1,itemsNavigationController2];
_window.rootViewController = tabbarController;