CocoaLumberjack/CocoaLumberjack — pull request #338 by MaddTheSane (2014-09-05 22:09:12+00:00)
Title: Use NS_ENUM and NS_OPTIONS for the log level and log flags

You can just pick fd9d3ed if you only want the enums/options.
This change does make CocoaLumberjack more Swift-friendly, but more work will be needed to make it viable.