Xamarin.Forms UWP上的缩放动画不重复

Question

I'm trying to set up an animation on my image similar to pulse on https://daneden.github.io/animate.css/

So, in Xamarin.Forms, i'm trying to recreate that animation using ScaleTo from class ViewExtensions:

await image.ScaleTo (1.3, 500);
await image.ScaleTo (1, 500);
await image.ScaleTo (1.3, 500);
await image.ScaleTo (1, 500);

But actually nothing appens, my image remains the same.

How can i resolve this?

Thanks for your help.

Answer 1

I would convert that CSS pulse to a custom Parent/Child animation.

CSS Pulse:

//animation-duration: 1s;
@keyframes pulse {
  from {
    -webkit-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1);
  }

  50% {
    -webkit-transform: scale3d(1.05, 1.05, 1.05);
    transform: scale3d(1.05, 1.05, 1.05);
  }

  to {
    -webkit-transform: scale3d(1, 1, 1);
    transform: scale3d(1, 1, 1);
  }
}

Xamarin Animation:

new Animation
 {
      { 0, 0.5, new Animation (v => image.Scale = v, 1, 1.05) },
      { 0.5, 1, new Animation (v => image.Scale = v, 1.05, 1) },
 }.Commit(this, "viewAnim", 16, 1000, Easing.Linear);