I am implementing custom headers for UICollectionView
I need a header on the Top for Horizontal CollectionView.
CodePudding user response：
In short, creating a custom UICollectionViewLayout is one way to get the results you want. This is quite a complex topic so the explanation is quite long.
Before adding some code, you will need to understand the different components in a UICollectionViewLayout such as cells, supplementary views and decoration views. Check 
source: 
If for some reason you weren't able to add the code to the right sections, have a look at this same example with the complete source code here
While I cannot cover everything, here are 3 great tutorials you can look at after going through this answer to understand more in depth: