Subclassing allows you to customize behaviors while you're developing your iOS application. Keep the following points about subclassing in mind as you develop your app:

  • In the first stage, you create a new class, called a subclass, that inherits properties from another (super) class

  • In the second stage, you add properties as needed for your iOS application.

  • In general, you'll want to subclass the following

    • UIView, to create your (more complex) content views, which you may fill with controls, graphics, and so on.

    • UIViewController, to manage the content views and connect them to the model.

    • NSObject, to create Model views and delegates.