iphone开发有用文件链接地址（重要）
十个优秀的 iPhone App 界面设计
//IOS 开发类库
http://developer.apple.com/library/ios/navigation/
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//iphone应用编程指南
http://www.apple.com.cn/developer/iphone/library/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/ApplicationSettings/ApplicationSettings.html#//apple_ref/doc/uid/TP40007072-CH13-SW4
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