Brian Voong

Currently not able to repro this with a brand new project, I'll take another stab at it once I get some free cycles again.

Bad Access:  The stack trace isn't that helpful so I've left it out. We're using a combination of Storyboard and UIKit here in some legacy code to render this...

> Ohhh, interesting! It sounds like changing `AnimationView` from a class to a typealias is source-compatible for existing Swift code but not for existing storyboards. Thanks for the info. >...

可能是M1出现问题了 试一下rosetta能不能跑起来 看看https://github.com/airbnb/lottie-ios/issues/1710

Core Animation engine definitely look smooth and 60+ FPS, but its hard to measure this for sure.