Beginning iPhone® SDK Programming with Objective-C®

Chapter 2. Write Your First Hello World! Application

WHAT YOU WILL LEARN IN THIS CHAPTER

• Create a new iPhone project

• Build your first iPhone application using Xcode

• Design the user interface (UI) of your iPhone application using Interface Builder

• Write some simple code to allow the application to rotate its content based on the orientation of the device.

• Add an icon to your iPhone application

Now that you have set up all the tools and SDK, you are ready to start developing for the iPhone and iPod Touch! For programming books, it is customary to start the chapter by showing you how to develop a "Hello World!" application. This approach allows you to use the various tools very quickly without getting bogged down in the details. It also provides you with instant gratification: You see for yourself that things really work, which can be a morale booster that inspires you to learn more.

GETTING STARTED WITH XCODE

Power up Xcode and you should see the Welcome screen, as shown in Figure 2-1.

Note

The easiest way to start Xcode is to type Xcode in Spotlight and then press the Enter key to launch it.

Figure 2.1. Figure 2-1

To create a new iPhone project, choose File

Figure 2.2. Figure 2-2

Although there are ...