Question

When a user run my app for the first time a LoginViewController appears. Once he is logged in, I present a ModalViewController with all the stuff of the app. If the user want to log out, I dismiss the modal view, showing the LoginViewController again.

The problem comes if the user runs the app when is already logged. In the self.window.rootViewController, I set directly the main view of the app (embebed in a UITabBarController), so if the user want to log out, I don’t know the way to “dismiss” the view and show the LoginViewController.

SCENARIO:

• User no logged yet: LoginViewController -> (Log in) -> UITabBarController -> (Log out) -> LoginViewController.
• User already logged: UITabBarController -> (Log out) -> LoginViewController.

I think there must be a simple way to do this, because it is a very normal behavior in an app with a login system, but I haven’t found a clean way to do it.

Answer 1

Try following way :

TabBarController *tabBarController1 = [[TabBarController alloc] init];
    self.window.rootViewController = tabBarController1.myTabBarController;
    [self.window makeKeyAndVisible];

   // if not Logedin
     if() {
    self.viewController = [[LoginViewController alloc] initWithNibName:@"LoginViewController" bundle:nil]; 
    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
   [self.tabBarController1 presentModalViewController:navController animated:NO];

    }

After Login, dismiss LoginViewController. Again while logout present LoginViewController modally on tabBarViewController as above.