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我们常常需要寻找一些电子书PDF文件，特别是一些国外的英文版电子书，因为很难在国内买得到，所以一些好的网站是非常值得收藏的。以下这22个都是免费的PDF网站，需要寻找国外资料...

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本书基于Swift 2.x，通过大量案例全面介绍苹果平台的应用开发。全书共分5 部分，包括Swift 语法篇、Cocoa Touch 框架编程篇、混合编程篇、进阶篇、项目实战篇，囊括了开发工具介绍、语言基础知识、编写HelloWorld 程序，直至应用在App Store 上线的所有内容。此外，本书前20 章专门配有同步练习，以帮助读者掌握所学知识。 本书适合iOS 开发者、其他移动平台开发者及计算机专业大学生参考阅读，也非常适合作为培训教材使用。

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图书Before & After 介绍、书评、论坛及推荐

图书The Non-Designer's Design Book 介绍、书评、论坛及推荐

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