title: align single UICollectionViewCell to the left of the collectionView
body: <p>I've got a collectionView that is inside a tableView cell. The collectionView has multiple sections. If a section has only one cell, the cell appears centered. How can I align that single cell to the left? </p>
  
  <p><a href="https://i.stack.imgur.com/fie0e.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/fie0e.jpg" alt="collectionView inside tableView cell"></a></p>
  
  <p>The collectionView has the following <code>flowLayout</code>:</p>
  
  <pre><code>let flowLayout = UICollectionViewFlowLayout()
  flowLayout.scrollDirection = .vertical
  flowLayout.sectionInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
  flowLayout.minimumInteritemSpacing = 0
  flowLayout.minimumLineSpacing = 0
  flowLayout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
  collectionView.setCollectionViewLayout(flowLayout, animated: true)
  </code></pre>