public override void AnimateTransition(IUIViewControllerContextTransitioning transitionContext)
{
var toViewController = transitionContext.GetViewControllerForKey(UITransitionContext.ToViewControllerKey);
var containerView = transitionContext.ContainerView;
var animationDuration = TransitionDuration(transitionContext);
var animation = (CASpringAnimation)CASpringAnimation.FromKeyPath("position.y");
animation.Damping = 10;
animation.InitialVelocity = 20;
animation.Mass = 1;
animation.Stiffness = 100;
animation.From = FromObject(containerView.Bounds.Height);
animation.To = FromObject(UIScreen.MainScreen.Bounds.Height / 2);
animation.Duration = TransitionDuration(transitionContext);
animation.AnimationStopped += delegate
{
transitionContext.CompleteTransition(true);
};
toViewController.View.Layer.AddAnimation(animation, null);
containerView.AddSubview(toViewController.View);
}
