原始链接
http://letsswift.com/2014/06/automatic-reference-counting
2、Swift语言iOS开发：CALayer十则示例
http://www.cocoachina.com/ios/20150318/11350.html
3、git管理
http://www.cocoachina.com/ios/20140524/8536.html
http://www.liaoxuefeng.com/wiki/0013739516305929606dd18361248578c67b8067c8c017b000
4、App Extension编程指南（iOS8/OS X v10.10）中文版
http://www.cocoachina.com/ios/20141023/10027.html
http://blog.csdn.net/huangchentao/article/details/35278663
原文链接：https://www.f2er.com/swift/327196.html