UI视图绘制矩形块的iOS，精选ios编程学习，很好的参考资料。-The UI view drawing of rectangular block of the iOS, select IOS programming learning, a good reference.

OpenGL ES关于长方块沿不过原点的任意轴旋转的实现Square，精选ios编程学习源码，很好的参考资料。-OpenGL ES on the rectangular blocks along any axis of rotation but the origin of Square, selection of learning IOS programming source code, a good reference.