title: monotouch Get Image to move around the screen
body: <p>Simple requirement but proving tricky.</p>
  
  <p>The sample code below I threw together as an example, my end goal is to produce a routine that makes an image bounce on a given x co-ordinate.
  However at the moment I'm just stuck on getting the thing to move for the second time.
  The animation below only happens once i.e I cannot get it to move up and down regardless of the From and To parameters.  It only moves once when loaded, i.e. </p>
  
  <pre><code>        private void LoadGetStarted() {
          UIImageView imageView = new UIImageView();
          UIImage getStartedImage = new UIImage("images/DownArrow.gif");
          float leftPos = 80f;
          RectangleF f2 = new RectangleF(leftPos,
                                              130f,
                                              200f,
                                              181f);
          imageView.Image = getStartedImage;
          imageView.Frame = f2;
          this.Add(imageView);
  
          Animate(imageView,"y",-100f,-200f);
          Animate(imageView,"y",-100f,200f);
          Animate(imageView,"y",10,100f);
  
      }
  
      private void Animate(UIImageView imageView,string type,float top, float bottom) {
          var theAnimation = CABasicAnimation.FromKeyPath("transform.translation."+type);
          theAnimation.Duration = 3;
          theAnimation.Speed = 2; 
          theAnimation.FillMode = CAFillMode.Both;
          theAnimation.From = NSNumber.FromFloat(top);
          theAnimation.To = NSNumber.FromFloat(bottom);
          theAnimation.RemovedOnCompletion = false;
          imageView.Layer.AddAnimation(theAnimation,"imageView");
      }
  </code></pre>