react / react/react-native

Animated tracking using the native driver does not work as expected

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API: Animated Issue: Author Provided Repro Needs: Triage :mag:
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描述

Description

Tracking a dynamic animated value (such as scroll position) using the native driver doesn't work correctly. Instead of animating the pinned value simultaneously, the animation only starts once the dynamic value stops changing.

React Native Version

0.71.11

Output of npx react-native info
System:
    OS: macOS 13.2.1
    CPU: (10) arm64 Apple M1 Max
    Memory: 81.73 MB / 32.00 GB
    Shell: 5.8.1 - /bin/zsh
  Binaries:
    Node: 16.18.1 - ~/.nvm/versions/node/v16.18.1/bin/node
    Yarn: 1.22.19 - /opt/homebrew/bin/yarn
    npm: 8.19.2 - ~/.nvm/versions/node/v16.18.1/bin/npm
    Watchman: 2022.11.07.00 - /opt/homebrew/bin/watchman
  Managers:
    CocoaPods: 1.11.3 - /opt/homebrew/bin/pod
  SDKs:
    iOS SDK:
      Platforms: DriverKit 22.4, iOS 16.4, macOS 13.3, tvOS 16.4, watchOS 9.4
    Android SDK: Not Found
  IDEs:
    Android Studio: Not Found
    Xcode: 14.3.1/14E300c - /usr/bin/xcodebuild
  Languages:
    Java: Not Found
  npmPackages:
    @react-native-community/cli: Not Found
    react: 18.2.0 => 18.2.0 
    react-native: 0.71.11 => 0.71.11 
    react-native-macos: Not Found
  npmGlobalPackages:
    *react-native*: Not Found

Steps to reproduce

I have created an example app that illustrates the problem.

  1. Clone the repository from https://github.com/kolking/animated-tracking, install and run the app in the simulator.
  2. When the native driver is disabled, scroll the bottom part horizontally to see how red dots follow the scroll position with a stagger effect.
  3. Now, in the App.tsx change the NATIVE_DRIVER constant to true, reload the app and try scrolling the bottom part again.
Snack, code example, screenshot, or link to a repository

Also please take note that when the native driver is enabled, it ignores the initial contentOffset. As a result, the red dots are initially displayed on the left and will only move to the center after a manually triggered scroll event.

useNativeDriver: false useNativeDriver: true

贡献指南

打开贡献指南

从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

调研方向

复现链接的动画跟踪示例中的行为,从 App.tsx 和 NATIVE_DRIVER 开关开始。比较禁用和启用原生驱动程序时的滚动行为,包括初始 contentOffset。完成标准是:动画点以交错效果跟随变化的滚动位置,并且在启用原生驱动程序时从初始偏移量开始。

由索引模型根据 Issue 内容生成。

评估

技术栈
react-native, typescript
领域
mobile
Issue 类型
缺陷
难度
4/5
预计耗时
3-5 天
活跃度
停滞
描述清晰度
基本清楚
新手友好度
35/100

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