mobile-web-messaging/MQTTKit — pull request #20 by tawdle (2014-10-02 17:32:19+00:00)
Title: Use NS_ENUM to define enums.

This seems to be the "modern" way to define enums in the Objective-C world. But the real benefit for me is that defining the enums this way makes them accessible as first-class types from Swift.