Ask HN: Mobile Devs – How do you prefer to receive animations from designers?

I'd like to know the preferences of mobile developers when receiving animations mocked up in one of the various prototyping tools (i.e. Flinto, Principle, Pixate).

I'm mostly concerned with native because tools like Framer allow you to re-use code in web applications.

How do you arrive at the final values for timings, durations, springs, easing curves etc?

I've seen many different forms of animation handoff: - Video file - dev required to guess at what's going on in the animation - Gif - same as above - Dev gets hands-on with the prototype - uses a mirror/viewer app to interact with the prototype but still needs to guess at what’s going on - Spec sheets - a list of all the values for timings, durations, springs and easing curves, but difficult to use in context, difficult to put together and difficult to read.

Any others? I want to build a better way!