Qfyilyi

when I add a UICollectionView to my ViewController in the Storyboard, there is a checkbox labeled "Section Header", how can I trigger that option programmatically(using an outlet of the CollectionView)

First of all you should register the HeaderView you want to use in your CollectionView like this

collectionView.register(UINib(nibName: HCollectionReusableView.nibName, bundle: nil), forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: "HCollectionReusableView")

And after that you can call in your UICollectionViewDataSource implementation, the function

func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {



    switch kind {

        case UICollectionElementKindSectionHeader:

            let reusableview = collectionView.dequeueReusableSupplementaryView(ofKind: UICollectionElementKindSectionHeader, withReuseIdentifier: "HCollectionReusableView", for: indexPath) as! HCollectionReusableView



            reusableview.frame = CGRect(0 , 0, self.view.frame.width, headerHight)

     //do other header related calls or settups

            return reusableview

        default:  

            fatalError("Unexpected element kind")

    }

}