Getting Black screen while using tabBar in iPhone application

Question

I am adding UITabBarController in my IPhone application.I hav mentioned it in my TabsAppDelegate.h like this

#import <UIKit/UIKit.h>

@interface TabsAppDelegate : NSObject <UIApplicationDelegate,   UITabBarControllerDelegate> {
    UIWindow *window;
    UITabBarController *tabBarController;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UITabBarController *tabBarController;


@end

and my TabsAppDelegate.m didFinishLaunchingWithOptions method

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:    (NSDictionary *)launchOptions {    



    // Add the tab bar controller's view to the window and display.
    [window addSubview:tabBarController.view];
    [window makeKeyAndVisible];

    return YES;
}

Now in MainWindow.xib i added Tab Bar controller and make connection with tabBarController. And later i created FirstViewController and SeconViewController which are two ViewControllers. Now at first tab i added my FirstViewController.xib and on second tab i added SecondViewController.xib file using builder interface.

But when i run the project it shows black screen. Need your help. Thanks in advance.

Answer 1

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    {


        UIViewController *viewController1 = [[[RootViewController alloc] initWithNibName:@"RootViewController" bundle:nil] autorelease];
                UINavigationController *navviewController1=[[UINavigationController alloc]initWithRootViewController:viewController1];
                navviewController1.title = @"FirstTitle";
        //        navviewController1.navigationBarHidden=YES;

        UIViewController *viewController2 = [[[yourviewController2 alloc] initWithNibName:@"yourviewController2" bundle:nil] autorelease];
                UINavigationController *navviewController2=[[UINavigationController alloc]initWithRootViewController:viewController2];
        //        navviewController2.navigationBarHidden=YES;
                navviewController2.title = @"SecondTitle";

        UIViewController *viewController3 = [[[yourviewController3 alloc] initWithNibName:@"yourviewController2" bundle:nil] autorelease];
                UINavigationController *navviewController3=[[UINavigationController alloc]initWithRootViewController:viewController3];
        //        navviewController3.navigationBarHidden=YES;
                navviewController3.title = @"ThirdTitle";

               //..... and so on depend on your requirement 

        self.tabBarController = [[[UITabBarController alloc] init] autorelease];
        self.tabBarController.viewControllers = [NSArray arrayWithObjects:navviewController1, navviewController2 , navviewController3 ,nil];
        self.window.rootViewController = self.tabBarController;
        [self.window makeKeyAndVisible];
    }

try this you just forgot to add rootViewController