UICollectionView Decoration and Supplementary views can not be moved

Question

In UICollectionView decoration and supplementary views seem to be a big mystery. There seems to be next to no example code at the moment. I managed to get both type

Answer 1

I had a similar symptom. My problem was that I had accidentally included the supplementary view's reuseID instead of the kindID when creating my custom layout.

Specifically I had this (Wrong)

UICollectionViewLayoutAttributes *attributes = 
  [UICollectionViewLayoutAttributes
    layoutAttributesForSupplementaryViewOfKind:myViewReuseID
    withIndexPath:sectionIndexPath];

When I should have this (Right)

UICollectionViewLayoutAttributes *attributes = 
  [UICollectionViewLayoutAttributes
    layoutAttributesForSupplementaryViewOfKind:myViewKindID
    withIndexPath:sectionIndexPath];

This meant that prepareForReuse was never getting called, and my old views never went away. Instead they kept piling up.