iphone上面用来读取pdf的代码，用来写电子书很不错-iphone pdf to read the above code, used to write very good books

关于iphone的 一个 读写通讯录的例子-On the iPhone read and write a mail list example

这是Apple的mac os X上编写应用程序必须进行必要的编码规范，特别是Object C的编码规范，可以帮助你读程序和写程序。-The document is coding rule on the mac os X system for developing application. Other it includes Object C++ s rule,it should help you read and write your ios applicaiton.