title: Change the animation from pushViewController to vertical
body: <p>I have 2 collectionViewController, each filled with cells with images where I can scroll through horizontally. Both are nested on a navigationViewController.</p>
  
  <p>Now, if I push a button, one controller shall switch to another with push:</p>
  
  <pre><code>[myNavController pushViewController:collectionViewController1 animated:YES];
  </code></pre>
  
  <p>How can I change the animation so the collectionViewController doesn't appear from the side, so that it comes in from the top/bottom?</p>
  
  <p>Thanks for the help!</p>
  
  <p>Edit:
  I solved the problem another way:
  I nested the 2 CollectionViewController inside a ScrollView.The Scrollview has the height of two screens. Now I can swipe from one to another CollectionView with no huzzle :). Good luck!</p>