title: iPhone Login Screen that shows a Table View after logging in the user
body: <p>I have a navigation based template application, I parse data into table view.
  I want to put a login screen before parse the data. I did the login screen and and succeed the login check.
  My problem is that when the user presses the button I change the view to the tableview.
  what a way should I draw? I want to learn how can i close the tableview screen when the app launched and after pressed the button I want to show the tableview.</p>