title: Drag UIVIew relative to finger
body: <p>I have a little problem.
  I have some UIView and I'm able to drag them with methods touchesBegan and touchesMoved.</p>
  
  <p>My problem is my UIView's coordinates (0,0) is coming under my finger. I would like to avoid that.</p>
  
  <p>Do you know how to do that. I try some things but with no success :(</p>
  
  <p>Thanks a lot !</p>