Xamarin iOS , Scale, Pan , Rotate Gestures - Code Snippet

Lets take an example of a UIImage in our case and apply all these gestures to that Image.

rotateGesture = new UIRotationGestureRecognizer((() =>
{
    if ((rotateGesture.State == UIGestureRecognizerState.Began || rotateGesture.State == UIGestureRecognizerState.Changed) && (rotateGesture.NumberOfTouches == 2))
    {
        imageView.Transform = CGAffineTransform.MakeRotation(rotateGesture.Rotation + r);
    }
    else if (rotateGesture.State == UIGestureRecognizerState.Ended)
    {
        r += rotateGesture.Rotation;
    }
}));

pinchGesture = new UIPinchGestureRecognizer(() =>
{
    if (pinchGesture.State == UIGestureRecognizerState.Began || pinchGesture.State == UIGestureRecognizerState.Changed)
    {
        pinchGesture.View.Transform *= CGAffineTransform.MakeScale(pinchGesture.Scale, pinchGesture.Scale);
        pinchGesture.Scale = 1;
    }
});

panGesture = new UIPanGestureRecognizer(() =>
{
    if ((panGesture.State == UIGestureRecognizerState.Began || panGesture.State == UIGestureRecognizerState.Changed) && (panGesture.NumberOfTouches == 1))
    {
        var p0 = panGesture.LocationInView(View);
        if (dx == 0) dx = p0.X - imageView.Center.X;
        if (dy == 0) dy = p0.Y - imageView.Center.Y;
        var p1 = new PointF(p0.X - dx, p0.Y - dy);
        imageView.Center = p1;
    }
    else if (panGesture.State == UIGestureRecognizerState.Ended)
    {
        dx = 0;
        dy = 0;
    }
});

panGesture.MaximumNumberOfTouches = 2;
imageView.AddGestureRecognizer (panGesture);
imageView.AddGestureRecognizer (rotateGesture);
imageView.AddGestureRecognizer (pinchGesture);