title: Class for move, scale and rotate, of a uiimageview
body: <p>I'm creating a subclass of UIImageView that detects touches, and will move, rotate and scale the image based on the touches.  However, I really feel like I'm reinventing the wheel here, and it's driving me nuts.  Shouldn't this already exist somewhere?</p>
  
  <p>Does anyone have any examples, or links to a class that is already doing this?  Or if you have a class you've written, that'd be helpful too. </p>
  
  <p>Thanks a lot in advance.</p>