Objective-C_2.0大全.pdf
iOS 5 Programming Cookbook
http://www.devdiv.com/iOS_iPhone-iOS_5_Programming_Cookbook%E7%BF%BB%E8%AF%91%E5%90%84%E7%AB%A0%E8%8A%82%E6%B1%87%E6%80%BB--%E6%9C%80%E8%BF%91%E6%9B%B4%E6%96%B06%E6%9C%884%E6%97%A5-thread-122853-1-1.html