title: Change UIslider thumb image while sliding
body: <p>I want to change UISlider thumb image during the slide.<br>
  Basically to set thumbImage acording to the value.<br>
  <img src="https://i.stack.imgur.com/Zy8k9.png" alt="enter image description here"></p>
  
  <p>The idea was to rotate the image according to the value and set it to the thumb.<br>
  So I tried to set the thumb image by overriding </p>
  
  <pre><code>-(BOOL)continueTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event
   [self setThumbImage:[self imageRotatedByDegrees:50] forState:UIControlStateHighlighted];
  </code></pre>
  
  <p>and I also tried the same thing when I added an action to my slider.
  Unfortunately in both implementations the image simply disappears.<br>
  Do you think it possible to achieve in the way I do it?
  If NO please explain and suggest an alternative way (hopefully not one that will customize and replace the whole slider)<br>
  If Yes I will really appreciate code sample.
  <a href="https://stackoverflow.com/questions/8899369/uislider-setting-images-for-different-ranges?rq=1">The more close answer that I found here</a> </p>
  
  <p>Thanks a lot.</p>