Sams Teach Yourself Objective-C in 24 Hours

Hour 14. Defining a Class in an Implementation File

What You’ll Learn in This Hour

• Cleaning up the Converter app

• Adding debugging code

• Refining the method

Working with a New Project

So far in this part of the book, you have explored many of the Objective-C basics—messaging and selectors; declarations of classes, instance variables, properties, methods, and actions; and building on Foundation. In this hour, you pull those concepts together as you define classes in their implementation files. After all, the definition of classes consists of the executable code rather than the declarations that set up the apps structure.

In the two hours that remain in this part of the book, you see how to work with the collection classes and how to manage ...