title: UIPinchGestureRecognizer position the pinched view between the two fingers
body: <p>I successfully implemented a pinch a zoom of a view. However, the view doesn't position itself where I wished it to be. For the stackoverflowers with an iPad, I would like my view to be centered like on the iPad Photos.app : when you pinch&amp;zoom on an album, the photos present themselves in a view that is expanding. This view is approximately centered with the top right hand corner on the first finger and the bottom left hand finger on the other finger. I mixed it with a pan recognizer, but this way the user always has to pinch, and then pan to adjust.</p>
  
  <p>Here are so graphic explanation, I could post a video of my app if that's unclear (no secret, i'm trying to reproduce the Photos.app of the iPad...)</p>
  
  <p>So for an initial position of the fingers, begining zooming :</p>
  
  <p><img src="https://i.stack.imgur.com/AKCnE.png" alt="enter image description here"></p>
  
  <p>This is the actual "zoomed" frame for now. The square is bigger, but the position is below the fingers</p>
  
  <p><img src="https://i.stack.imgur.com/x2GLF.png" alt="given the start position"></p>
  
  <p>Here is what I would like to have : same size, but different origin.x and y :</p>
  
  <p><img src="https://i.stack.imgur.com/aQ9Pm.png" alt="enter image description here"></p>
  
  <p>(sorry about my poor photoshop skills ^^)</p>