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Obviously iOS based devices such as the iPad and iPhone do not have windows that the user can resize in the conventional sense that we are used to in the world of desktop applications. The iPad is, however, sensitive to physical rotation, providing the option for a running application to be displayed in either portrait or landscape mode. Given this capability, it is essential that an iPad application user interface layout adapt accordingly should you decide to support different device orientations within your application.
In this chapter we will look at the mechanism for enabling rotation and modifying the layout of user interfaces within an application. In the course of this chapter we will be talking about concepts such as the view, superviews, subviews and view hierarchies. If these concepts are unfamiliar to you we recommend first reading the chapter entitled [[Understanding iOS 4 iPad Views, Windows and the View Hierarchy (Xcode 4)|Understanding iOS 4 iPad Views, Windows and the View Hierarchy]] before proceeding.
== Setting up the Example ==
