UICollectionView Horizontal Sticky Headers

Question

I implement a UICollectionView with a set of sections, and I view the elements horizontally. I should have done this, but I can hardly add a section title on top of the elements. I tried to add a section title accessory, but it was added before the first item (not top).

This link provides a way to create a horizontal sticky header, but still not on top of the elements.

This is what I'm trying to accomplish.

Any help would be greatly appreciated.