Changes

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 iPhone Views, Windows and the View Hierarchy before proceeding.

In the remainder of this chapter we will work through a self contained example. To set up this example, start Xcode and create a new iOS View-based iPhone project named layout.