cloudkite/Classy — pull request #28 by skeeet (2014-01-07 01:18:35+00:00)
Title: Added support for [UIButton setImage:forState:]

I suppose this was removed by mistake or never implemented.
Anyways, not is it possible to set UIButton image, same way as background image.

UIButton{
image[state:normal]: $someImageVarName;
}