Design a compelling user interface for your iOS application. A great interface is made up of high-quality graphics and a sparing amount of text, in a window that occupies the entire iPhone screen. Most of the user-interface objects you incorporate into your applications are available through the UIKit framework. These objects include windows, image views, progress indicators, toolbars, navigation bars, table views, and various controls, such as buttons and sliders. To display contact information, you use the Address Book UI framework.