When to Use Subclassing in iPhone and iPad Game Development

By Neal Goldstein, Jon Manning, and Paris Buttfield-Addison

Part of the iPhone and iPad Game Development For Dummies Cheat Sheet

Subclassing is one of the mechanisms you use to customize behaviors while you develop your iPhone or iPad game. Subclassing involves the following two stages:

Creating a new class, dubbed a subclass, that inherits properties from another (super) class
Adding properties as needed for your iPhone application

In general, you want to subclass

UIView: To create your (more complex) content views, which you may fill with controls, graphics, and the like
UIViewController: To manage the content views and connect it to the model
NSObject: To create Model views and delegates