Beginning iOS 5 Games Development: Using the iOS 5 SDK for iPad, iPhone, and iPod Touch

Abstracting the UI

In the previous example, we looked at the basics of creating a frame-by-frame animation. We looked how we can use the class CADisplayLink in conjunction with the existing event loop to call a task where we can implement our animation. We animated a single image around the screen based on user input. This was a very simple example. I left out a number of practical considerations so we could focus on the basic idea of creating animations in this way. In this section, we will do a little refactoring in order to better support more complicated games. Figure 5–7 shows the example we will be building.

Figure 5–7. Abstracted UI ...