title: Making a background of a UIViewController less "alpha"
body: <p>I have an image that I want to use as the background of my UIViewController. I can add it as a UIView. The point is that I want to add some transparency to it. I don't want the image to be as opaque as the original image, because it has some graphics on it and would be way too distracting. So I want to make it faded, sort of. I hope that makes sense.</p>
  
  <p>Maybe I should subclass UIView? Can anyone show me the code to do something like this?</p>