作者：Hawstein
出处：http://hawstein.com/posts/make-thiner-tspl.html
声明：本文采用以下协议进行授权： 自由转载-非商用-非衍生-保持署名|Creative Commons BY-NC-ND 3.0 ，转载请注明作者及出处。
About Swift
We simplified memory management with Automatic Reference Counting.
Swift provides seamless access to existing Cocoa frameworks and mix-and-match interoperability with Objective-C code.