The controllers you have explored in this chapter make your app behave and look more like an iOS app. With
UINavigationController, you added hierarchical navigation to viewing and editing cars. After you added the controller to the scene, hooked up the hierarchy, and set some properties, the navigation controller handled the extra interface elements and movement between screens.
UITabBarController to group related sets of content and made moving between content easy. It took just a bit of work in IB and a few lines of code. You also built a view controller outside the storyboard, using both IB and code. Then you integrated it into the flow of your app.
In addition, you used tinting to add more differentiation to your app, added ...