title: UICollectionView Scroll to next item
body: <p>The idea is replacing PageController with UIScrollView, UIScrollView should only scroll to the next/previous item and stop. I've found a few solutions, but I've only understood that I've to use targetContentOffsetForProposedContentOffset, but have no idea what CGPoint should I return and how to stop on the next item even if user scrolls with high velocity.</p>
  
  <pre><code>    override func targetContentOffsetForProposedContentOffset(proposedContentOffset: CGPoint, withScrollingVelocity velocity: CGPoint) -&gt; CGPoint {
      return CGPoint(x: 0, y: 0)
     }
  </code></pre>