airbnb/lottie-ios

The Main Thread rendering engine doesn't currently support repeaters. To play an animation with repeaters, you can use the Core Animation rendering engine instead

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#1739 opened on Sep 5, 2022

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enhancementhelp wanted

Description

Hi, I am getting this error.

Lottie/ItemsExtension.swift:83: Fatal error: The Main Thread rendering engine doesn't currently support repeaters. To play an animation with repeaters, you can use the Core Animation rendering engine instead. 2022-09-05 21:45:24.501920+0400 Demo[46949:6094753] Lottie/ItemsExtension.swift:83: Fatal error: The Main Thread rendering engine doesn't currently support repeaters. To play an animation with repeaters, you can use the Core Animation rendering engine instead.

Which Version of Lottie are you using?

Lottie 3.4.3

Animation JSON

https://lottiefiles.com/59461-heart-beat-pop-up

Contributor guide

Tech stack
swift
Domain
mobile
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
needs maintainer response
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
SwiftiOS developmentLottie basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate the Main Thread rendering engine's lack of repeater support. Look into the Lottie Swift source code, particularly `ItemsExtension.swift` line 83, and understand how repeaters are handled in the Core Animation engine. Consider whether it is feasible to add repeater support to the Main Thread engine, and outline the necessary changes. If the issue is a design limitation, document the decision and update the error message to be more informative.