iPhone-Poly-Demo 介绍
该程序只是为了验证 iPhone 的应用程序开发，学习 iPhone 的开发人员不妨看看。该项目主要包含 iPhone 的一些编程概念包括：
- MVC patterns : this application uses the Interface Builder and an MVC approach to modeling a polygon shape.
- Custom UIViews and Drawing : Using Quartz2D, this program renders a polygon based on user actions. This is done using a child of the UIView class and overriding the drawRect: method.
- Animation : using an NSTimer this application animates the active polygon. This uses the Affine transforms in Quartz2D.
- Multi-touch : detects swipes to allow the user to speed up or slow down the spinning of the animated polygon.