title: show a login screen before Tab bar controller?
body: <p>i am designing an iphone application which should be display login screen initially, after that it should display tab bar controller with 5 tabs.
  Am able to launch login screen initially, but after that am unble to show tab bar controller, kindly help me out with the source code guys.
  here is my code:
  this is a view based application</p>
  
  <p>application.M</p>
  
  <pre><code> -(void)applicationDidFinishLaunching:(UIApplication *)application {    
  
      // Override point for customization after app launch 
         [window addSubview:viewController.view]; 
      [window addSubview:tabBarController. view];   
      [window makeKeyAndVisible];
      LoginView *loginView=[[LoginView alloc]initWithNibName:@"LoginView" bundle:nil];
      [window addSubview:loginView.view];
  }  
  </code></pre>
  
  <p>by doing this the tab bar controller is displaying at the bottom of the login screen initially.And also am unable to switch between the tab bar items.</p>