Chapter 11. User Interaction

In This Chapter

• The Click of a Mouse

• Hit Testing CALayer Objects

• Hit Test

• Example Application: Color Changer

• LZButtonLayer

• Interface Builder

• Building the Layers

• Watching the Mouse

• Keyboard Events

• Layer-Backed Views

What is the point of a graphical interface if a user cannot interact with it? However, a quick exploration of the Core Animation API reveals that it has no direct way to receive user interaction!

This chapter focuses on how to add interaction points to an application, specifically to Core Animation. We look at both mouse interaction and keyboard input.

The Click of a Mouse

The most common interaction users expect from your application is the ability to click the mouse on various interface ...

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