Animated tracking using the native driver does not work as expected
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API: Animated
Issue: Author Provided Repro
Needs: Triage :mag:
- 主要语言
- C++
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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.
- Clone the repository from https://github.com/kolking/animated-tracking, install and run the app in the simulator.
- When the native driver is disabled, scroll the bottom part horizontally to see how red dots follow the scroll position with a stagger effect.
- Now, in the
App.tsxchange theNATIVE_DRIVERconstant totrue, 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
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- Fork 仓库,在一个分支上完成修改。
- 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