title: How to get UISlider thumb position
body: <p>How to know UISlider thumb position?<br>
  When I press a button I want to add a flag on the current slider thumb position.<br>
  How can I acquire the current thumb position so I can add the flag?</p>
  
  <p>This is my synchronization code:</p>
  
  <pre><code> _positionSlider.value = _mediaplayer.position;
  </code></pre>
  
  <p>This is how the slider should look like:</p>
  
  <p><img src="https://i.stack.imgur.com/E9PEK.jpg" alt="look like this image">  </p>