title: Using a UIScrollView to change the alpha of an image
body: <p>My aim is to effectively use a UIScrollView as a UISlider.</p>
  
  <p>I've managed to code a UISlider to change the alpha of an image however I want to code a scrollview to change the alpha of an image when it is scrolled. </p>
  
  <p>I think I'm on the right lines by using the scroll views content offset to adjust alpha balances in the scroll view delegate but I just can't seem to get the code to work! </p>
  
  <p>Any suggestions on how I can get do this?</p>
  
  <p>Thanks</p>