title: Is Instagram stories in UICollectionView or UIPageViewController?
body: <p>I want to make stories like app. I see that some people say <code>UIPageViewController</code> meant to limited views. What I found is also that loading images are slow in <code>UIPageViewController</code> when scroll to another.
  What are the differences between <code>UICollectionView</code> or <code>UIPageViewController</code>? When to use one over another?</p>
  
  <p>What should I use to make stories like app?</p>