How to make a framework for iOS?

How to make a framework is important in iOS development, recently I have got a project, it is provided a sdk as a plug-in for other projects, so how to do it?  Google it and I have solved the problem.

Flow is:

Reference:

http://blog.csdn.net/chen505358119/article/details/9190731

http://www.oschina.net/translate/create-your-own-ios-framework

http://blog.sina.com.cn/s/blog_74e9d98d01014j2h.html

http://blog.163.com/nijino_saki/blog/static/800921442013323104918310/

http://www.cocoachina.com/industry/20140526/8548.html

http://www.cocoachina.com/bbs/read.php?tid-75680.html

http://blog.csdn.net/kmyhy/article/details/7369354

http://www.cnblogs.com/heyonggang/p/3513479.html

http://blog.csdn.net/waterforest_pang/article/details/7755403

http://www.2cto.com/kf/201301/185185.html

http://www.baidu.com/s?wd=iOS%20%E5%A6%82%E4%BD%95%E5%88%B6%E4%BD%9CFramework&rsv_bp=0&tn=baidu&rsv_spt=3&ie=utf-8&rsv_sug3=29&rsv_sug4=665&rsv_sug1=21&rsv_sug2=0&inputT=11034