title: UICollectionView horizontal scroll with vertical header
body: <p>I am creating a UICollectionView which scrolls horizontally but with a vertical section header. </p>
  
  <p>My problem is that for horizontal scrolling, the section header defaults to the left side of the collection view and I cannot adjust it to the top of the UICollectionView.</p>
  
  <p>I have checked out various solutions which includes DateFlowLayout which unfortunately does not work anymore.</p>
  
  <p><img src="https://i.stack.imgur.com/bSxer.png" alt="enter image description here"></p>