User interface elements in iOS include views and controls. Views provide content regions with well-defined sets of functionality. Controls are graphic objects that cause instant actions or visible results. Although all an application’s views and controls are contained in the application’s single window, users see and interact with them in screens, which roughly correspond to different visual states in the application.
iOS defines the standard appearance of these user interface elements, and delivers consistent behaviors that users expect. Read the chapters in Part II to learn about the types of user interface elements available and how to use them to build the user interface of your application.
Last updated: 2010-08-03