title: UITableViewCell highlighting with hiding separator lines
body: <p>I'd like to have a <code>UITableView</code> with custom <code>UITableViewCell</code>s and custom separators.</p>
  
  <p>As far as I know there is no separate "separator view", so I have to include the separator image in the cells themselves, either on top of a cell or at the bottom.</p>
  
  <p>When I highlight a cell after selection, I can only influence the cell's own appearance - so while it's possible to hide the separator image in the cell in question <strong>the separator image from the cell above (or below) will still be visible</strong>.</p>
  
  <p>Is there any (easy and reliable) way to hide <strong>BOTH</strong> separator lines on cell highlighting?</p>
  
  <p><strong>Better explanation:</strong></p>
  
  <p>What I'd like to do is the following: The left image shows the cells (red lines) with the separators (thick black lines), the right image shows the middle cell selected - the green selection image hiding the middle cell's separator image and the separator image of the top cell.</p>
  
  <p><img src="https://i.stack.imgur.com/IRgUZ.png" alt="Cells with separators">    <img src="https://i.stack.imgur.com/nw8n9.png" alt="Selected cell hiding two separators"></p>
  
  <p>I already tried setting the selection image's frame to a -3 y position, but that doesn't help, as table cell views are painted in order from higher to lower ...</p>