[IOS] AFNetworking 使用教程

 AFNetworking 速成教程 (1) :

 http://www.raywenderlich.com/zh-hans/36079/afnetworking%E9%80%9F%E6%88%90%E6%95%99%E7%A8%8B%EF%BC%881%EF%BC%89

 AFNetworking 速成教程 (2) : 

http://www.raywenderlich.com/zh-hans/36078/afnetworking%E9%80%9F%E6%88%90%E6%95%99%E7%A8%8B%EF%BC%882%EF%BC%89