How to reproduce watchOS closing activity ring animation with sparks on iOS?

Here at the university of science in zürich in the usability lab, we use:\n\n\nsketch or illustrator or designer.gravit.io for designing the svg sketches. \nthan we import it in after effects or in Haiku.ai for animating \nand export it as .json for airbnbs animations library Bodymovin or also known as Lottie. Therefor are libraries for web, android and ios available. \n\n\nThe advantage of this solution over @bryanjclark \"exported it as a series of images\" is that the animation is sharp in every resolution (svg), it is only one .json file and you have the full control over its speed and frames.\n\nOtherwise if you really want to do it with code only, give a look at this Article, done with OpenGL ES2.0. \n\nOr with the AnimationCore example in this SO Answer.",