Hour 7. Declaring a Class in an Interface File
What You’ll Learn in This Hour
• Developing classes
• Introducing protocols
• Looking at class declarations
Letting Xcode Do the Work
In Hour 6, “Exploring Messaging,” you saw how you use messages to tell an object (the recipient) what to do. The message itself consists of the name of a method along with zero or more arguments. At runtime, information about the receiver is used to determine what method to invoke.
That is the how of Objective-C. This hour begins an in-depth look at the what of Objective-C—the classes that are instantiated at runtime into instances or into class objects themselves. Within classes, you find the methods that are performed as a result of messages.
Designing Classes
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