利用预渲染解决优化性能问题IOS

http://www.keakon.net/2011/07/26/%E5%88%A9%E7%94%A8%E9%A2%84%E6%B8%B2%E6%9F%93%E5%8A%A0%E9%80%9FiOS%E8%AE%BE%E5%A4%87%E7%9A%84%E5%9B%BE%E5%83%8F%E6%98%BE%E7%A4%BA