Switch from a View (Login) to another View with a TabBarController

i'm new at IPhone SDK Developing and now i need some help.

I have a LoginView where the User have to authentificate 开发者_运维知识库his legitimacy. After he enter his Username and Passwort he click on the "Sign In" Button.

Then i want to load my "Real-App". Here is the Problem because i can't switch from the LoginScreen to the TabBarController. I found many solutions but only for switching to other views.

Is there a way to do it ?

Just remove the LoginView using

[loginViewController.view removeFromSuperView];

Then add the TabBar with

[window addSubview:tabBarController.view];