国内外外开发者

http://www.cimgf.com/2010/05/02/my-current-prefix-pch-file/

http://blog.devdiv.com/xcode4-%E7%9A%84%E8%B0%83%E8%AF%95%E5%AE%9A%E4%BD%8D%E6%8A%80%E5%B7%A7.html

http://longtimenoc.com/

http://www.robinlu.com/  内容较多。

http://bill.dudney.net/roller/objc/entry/catiledlayer_example 有深度。