一个很不错的框架，blockskit, 待实践

http://www.cocoachina.com/ios/20160505/16112.html

http://cocoadocs.org/docsets/BlocksKit/2.2.5/Categories/NSObject+A2BlockDelegate.html

http://www.jeepshoe.org/249144506.htm

https://github.com/zwaldowski/BlocksKit