This category adds methods to the UIKit framework's UIButton class. The methods in this category provide support for loading remote images and background images asynchronously from a URL.
Thanks for the patch, @devxoul. As it were, extended UIKit categories is a planned feature for AFNetworking 2.0, so I have a file looking a lot like what you submitted sitting in a local branch. I'm not quite ready to extract all of that into a new repository, but I'll be sure to merge in your contributions when it comes time. Great work!
A UIButton+AFNetworking category has been implemented in the 2.0 branch. See 17e42c3.