title: Size of default thumb image for iOS slider?
body: <p>What is the exact size (width, height) of the (default) thumb image for the iOS slider? Is there perhaps some clever way to coax this out of the system (XCode, iOS)?</p>
  
  <p>I tried</p>
  
  <pre><code>int thumbWidth = slider.currentThumbImage.size.width;
  </code></pre>
  
  <p>which I found <a href="https://stackoverflow.com/questions/1714405/how-to-get-the-center-of-the-thumb-image-of-uislider">here</a> on this site, but it comes back with 0.</p>
  
  <p>Additional question: The Xcode debugger shows this undocumented variable in the <code>UISlider</code>: <code>CGFloat _hitOffset</code>. Does anyone by chance know what it is and what it's for?</p>