title: How to detect or define the orientation of a pinch gesture with UIPinchGestureRecognizer?
body: <p>I'm using UIPinchGestureRecognizer to detect pinch gestures, something like: </p>
  
  <pre><code>- (void) initPinchRecon {
   UIPinchGestureRecognizer *pinchRecognizer = [[[UIPinchGestureRecognizer alloc] 
                initWithTarget:self
                action:@selector(Perform_Pinch:)] autorelease];
   [self addGestureRecognizer:pinchRecognizer];
  
   [pinchRecognizer setScale:20.0f];
  }
  
  - (void) Perform_Pinch:(UIPinchGestureRecognizer*)sender{
   NSLog(@"PINCH");
  } 
  </code></pre>
  
  <p>And it works well to detect a simple pinch gesture: It's possible to determine (or define myself) the angle or orientation of the pinch gesture ?, for example, to differentiate between an horizontal and an vertical pinch gesture ?</p>