In the last chapter, you created your first HelloWorld application and an Apple-Stock application with Xcode. In this chapter, you’ll build on this foundation of iOS application programming with a focus on how to create the custom view class in Xcode and how to use the Debugger to eliminate bugs during the project development lifecycle.
First, let’s work on how to create a custom class together with Xcode. New programs are usually full of new classes. Here are three major reasons you may want to create new classes: