title: Swift - Change height of CollectionView Header
body: <p>I would like to change the height of the header of my <code>CollectionViewController</code>.</p>
  
  <p>I already know that I could use a code like that:</p>
  
  <pre><code>func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -&gt; CGSize {
      return CGSize(width: collectionView.frame.size.width, height: 250)
  }
  </code></pre>
  
  <p>I would like to do that, but directly within the UICollectionReusableView (the header view).</p>
  
  <p>Is there any function that allows that?</p>