UICollectionView sticky header

// Initialize Flow Layout.

    UICollectionViewFlowLayout *layout=[[UICollectionViewFlowLayout alloc] init];

    layout.sectionHeadersPinToVisibleBounds = YES;

    layout.itemSize = CGSizeMake(cellWidth, cellHeight);

    layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;

    layout.minimumInteritemSpacing = 5;

    layout.minimumLineSpacing = 5;

Assign this UICollectionViewFlowLayout to UICollectionView and to collection view sticky header get sets.