title: scroll view not scrolling vertically
body: <p>I have a scroll view that it not scrolling at all:</p>
  
  <p><a href="https://i.stack.imgur.com/ZfiRp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ZfiRp.png" alt="enter image description here"></a></p>
  
  <hr>
  
  <h2><a href="https://i.stack.imgur.com/vsq75.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vsq75.png" alt="enter image description here"></a></h2>
  
  <p><a href="https://i.stack.imgur.com/dyp46.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dyp46.png" alt="enter image description here"></a></p>
  
  <pre><code>    scroll_view_content_a_job.contentSize.height = 1800
      scroll_view_content_a_job.isScrollEnabled = true
  </code></pre>