简单，从来都不简单！
这个是中文版的，值得好好看啊。
Source: http://nteswjq.blog.163.com/blog/static/1269981201352001336753/
Simple is never simple!
> By Duan Yongping · his NetEase blog (nteswjq.blog.163.com, now closed; read from web archives) · 2013-06-20 · [Original link](http://nteswjq.blog.163.com/blog/static/1269981201352001336753/) ([archived](https://web.archive.org/web/20130628043549/http://nteswjq.blog.163.com:80/blog/static/1269981201352001336753/))
http://www.apple.com.cn/ios/ios7/design/
This is the Chinese version; it's well worth reading carefully.
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