Xamarin.ios 单触式动画加速

是否可以以更快的速度创建动画？类似于加速动画的东西

我有一些代码，但找不到实现它的方法。谷歌搜索也没有帮助

CABasicAnimation animation =  CABasicAnimation.FromKeyPath("opacity");
animation.To = NSNumber.FromFloat( 0.1f );
animation.Duration = 1.4f;
animation.Delegate = new ExponencialSpeedAnimationDelegate();
animation.RepeatCount = 3;
this.Layer.AddAnimation(animation, "opacity");

试一试

animation.TimingFunction = CAMediaTimingFunction.FromName (CAMediaTimingFunction.EaseIn);