Implementing the Twitter Scroll

gistfile1.txt

http://www.thinkandbuild.it/implementing-the-twitter-ios-app-ui/

var blur = UIBlurEffect.FromStyle(UIBlurEffectStyle.Light);
var blurView = new UIVisualEffectView(blur)
{
    Frame = this.Image.Bounds
};
this.bluredImage.Image = this.Image.Image;
this.bluredImage.AddSubview(blurView);

if (cardOffset.Y < 0)
{
    var scaleFactor = (-cardOffset.Y / this.Image.Bounds.Height);
    var sizeVariation = ((this.Image.Bounds.Height * (1f + scaleFactor)) - this.Image.Bounds.Height) / 2f;

    var transform = CATransform3D.Identity;
    transform = transform.Translate(0, sizeVariation, 0);
    transform = transform.Scale(1f + scaleFactor, 1f + scaleFactor, 0);

    this.bluredImage.Alpha = (float)Math.Min(1f, (-2 * cardOffset.Y / this.Image.Bounds.Height));
    this.Image.Layer.Transform = transform;
}
else
{
    this.bluredImage.Alpha = 0;
    this.Image.Layer.Transform = CATransform3D.Identity;
}