Beginning iPhone Development, Seventh Edition

Chapter    3

Handling Basic Interaction

Our Hello World application was a good introduction to iOS development using Cocoa Touch, but it was missing a crucial capability—the ability to interact with the user. Without that, our application is severely limited in terms of what it can accomplish.

In this chapter, we’re going to write a slightly more complex application—one that will feature two buttons as well as a label (see Figure 3-1). When the user taps either of the buttons, the label’s text will change. This may seem like a rather simplistic example, but it demonstrates the key concepts involved in creating interactive iOS apps. Just for fun, we’re also going to introduce you to the NSAttributedString class, which lets you use styled text ...