Draggable UIView

public class InteractiveView : UIView
	{
		public bool IsDragDisabled {
			get;
			set;
		}

		public bool IsPinchDisabled {
			get;
			set;
		}

		public bool IsRotateDisabled {
			get;
			set;
		}

		private CGRect originalImageFrame = CGRect.Empty;

		private nfloat _scale;
		private nfloat _angle;

		public InteractiveView (IntPtr handle)
			: base(handle)
		{
		}

		public InteractiveView (CGRect frame)
			: base(frame)
		{
			originalImageFrame = frame;

			var panGesture = new UIPanGestureRecognizer ();
			panGesture.AddTarget (() => HandleDrag(panGesture));

			var pinchGesture = new UIPinchGestureRecognizer ();
			pinchGesture.AddTarget (() => HandlePinch(pinchGesture));

			var rotateGesture = new UIRotationGestureRecognizer ();
			rotateGesture.AddTarget (() => HandleRotate(rotateGesture));

			panGesture.ShouldRecognizeSimultaneously = (gesture1, gesture2) => gesture2 == pinchGesture || gesture2 == rotateGesture;
			pinchGesture.ShouldRecognizeSimultaneously = (gesture1, gesture2) => gesture2 == panGesture || gesture2 == rotateGesture;
			rotateGesture.ShouldRecognizeSimultaneously = (gesture1, gesture2) => gesture2 == panGesture || gesture2 == pinchGesture;

			this.AddGestureRecognizer(pinchGesture);
			this.AddGestureRecognizer(panGesture);
			this.AddGestureRecognizer(rotateGesture);
		}


		private void HandleDrag(UIPanGestureRecognizer recognizer)
		{
			if (IsDragDisabled)
				return;


			// If it's just began, cache the location of the image
			if (recognizer.State == UIGestureRecognizerState.Began)
			{
				originalImageFrame = this.Frame;
			}

			// Move the image if the gesture is valid
			if (recognizer.State != (UIGestureRecognizerState.Cancelled | UIGestureRecognizerState.Failed
				| UIGestureRecognizerState.Possible))
			{
				// Move the image by adding the offset to the object's frame
				CGPoint offset = recognizer.TranslationInView(this);
				CGRect newFrame = originalImageFrame;
				newFrame.Offset(offset.X, offset.Y);
				this.Frame = newFrame;
			}
		}


		private void HandlePinch (UIPinchGestureRecognizer pinchGesture)
		{
			if (IsPinchDisabled)
				return;

			_scale = pinchGesture.Scale;

			this.Transform = MakeTransform();
		}

		private void HandleRotate (UIRotationGestureRecognizer rotateGesture)
		{
			if (IsRotateDisabled)
				return;

			_angle = rotateGesture.Rotation;

			this.Transform = MakeTransform();
		}

		private CGAffineTransform MakeTransform()
		{
			var transform = CGAffineTransform.MakeIdentity();
			transform.Scale(_scale, _scale);
			transform.Rotate(_angle);
			return transform;
		}
	}