有关如何使用UITabBarController的简单易懂的例子吗？

I want to use a UITabBarController but find that very difficult. I have a book that uses it in a giant project where I would have to complete that for a week or so and then find out what parts belong to making the UITabBarController work. Maybe you know of an good article about that?I want to use a UITabBarController but find tha