title: How can I change the scroll direction in UICollectionView?
body: <p>I have a <strong>UICollectionView</strong> in my storyboard based <strong>iOS</strong> app.
  When the device is in the portrait orientation I'd like it to scroll vertically, and when it's in Landscaper I'd like it to scroll horizontally.</p>
  
  <p>In UICollectionView I can see the <em>scrollEnabled</em> member, but I can see no way to set the scroll direction. Have I missed something?</p>