Objective C adding a tab bar item to change to other views

I Have a normal view based application and have added an UITabBar component.开发者_StackOverflow I have found help how to create a tabbar app but nothing about how to use the UITabbar item separately

How may I use this to switch views please?

Have you inserted your UIViewControllers in the UITabBarController? You'd better have a look at this guide and maybe post some code of yours