title: UISlider with thumb center over the start and end of track
body: <p>The default behaviour of <code>UISlider</code> is that its thumb isn't centered on start/end of track. Like below:</p>
  
  <p><a href="https://i.stack.imgur.com/eDnTH.png" rel="noreferrer"><img src="https://i.stack.imgur.com/eDnTH.png" alt="default UISlider"></a></p>
  
  <p>I would like to modify it's behaviour to get:</p>
  
  <p><a href="https://i.stack.imgur.com/ywFmJ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/ywFmJ.png" alt="desired slider"></a></p>
  
  <p>where thumb's center can be positioned on start or end.</p>
  
  <p>I have tried to cover start/end  with empty <code>UIView</code>. Effect is that is look almost ok, but thumb has dropshadow that reveals my hack in some positions (which I can live with), however my <em>hacky</em> view covers a little the thumb and captures it's touch event (even when user interactions are disabled).</p>
  
  <p>So I guess I would need to pack my <em>hacky</em> view between thumb and track. Possibly without manipulating its internal views. Any ideas?</p>