Regarding Login Page before loading Tabbarcontroller with navigationcontroller for iPhone

As i am newbie i want to add navigation controller with tabbar controller and login page and when i click on logout button开发者_Python百科 on tabbar controller view it will let me to login page without navigationbar as well as without tabbar contrller. Thanks in advance.

on click of that tab call a function and that function contains these line of code

self.hidesBottomBarWhenPushed=YES;//for hiding tabBar

befor push statements

and use this

self.navigationController.navigationBarHidden=YES;//for hiding navigation bar