chiahsien/CHTCollectionViewWaterfallLayout — pull request #32 by kylerobson (2013-11-26 01:02:03+00:00)
Title: Support single column and customizable vertical item spacing

There's also a change in - (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)path {

I was getting a crash sometimes on that method. The code I added on that method is probably just a paranoid bandaid, but I don't think it hurts anything.