http://www.cocoachina.com/ios/20150123/10994.html

Streams 表现为RACStream类，可以看做是水管里面流动的一系列玻璃球，它们有顺序的依次通过，在第一个玻璃球没有到达之前，你没法获得第二个玻璃球。...

MVC: Massive View Controller. Alot of the time, it’s convenient to put business logic and other code into viewcontrollers, even if that’s not architectu...