屏幕适配的第三方库: https://github.com/SnapKit/Masonry
swift纯中文翻译教程: http://www.swiftmi.com/swiftbook_cn/chapter1/02_a_swift_tour.html
响应式编程: http://www.cocoachina.com/ios/20150702/12302.html
环信 第三方IM聊天的SDK: http://www.easemob.com
好文章：http://www.cocoachina.com/ios/
