title: How do I set a UIView image UIImageView to the background?
body: <p>I have a custom view for which I've (in the XIB) created a UIImageView as a subview.  How can I make the image view appear in the background?  (i.e. so that in the custom view I can create the hands of a clock that will appear over the top)</p>
  
  <p>Do I need to make my background image have alpha areas for transparency?  (if I have the terms correct)  Or is it OK to have an image with it's background just set to white or black or whatever it needs to be (on the basis it will be in the background so this will be ok)</p>