[ios] Inverse scale transforms results in pixelated blurred poor resolution views
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描述
Description
We have a production app where we have a pinch gesture handler that allows pinch zooming on a map. When the map is zoomed in (scaled up) the child POIs are scaled down to preserve sizing of POIs. Example, if the parent View is scaled by 100 the child POI View is then scaled by 0.01 to counteract the transform and preserve sizing. This works perfectly on Android; however, IOS results in a very pixelated render of the child POI View. It appears on IOS, when a View has nested scale transforms applied such that they are inverse the resulting render is pixelated. On Android the View appears high resolution as expected. (See screenshots below).
See main code in app/{tabs}/index.jsx of repro.
Related:
https://github.com/facebook/react-native/issues/42837
Steps to reproduce
Both Architectures: Paper & Fabric
IOS
- Install dependencies
npm installandnpx pod-install - Run
npx react-native run-iosornpm startand open on ios expo - Notice blurred blue View when it should be a solid red square with blue border (bug)
ANDROID
- Install dependencies
npm install - Run
npx react-native run-android - Notice solid red square with blue border (expected)
React Native Version
0.76.6
Affected Platforms
Runtime - iOS
Output of npx react-native info
System:
OS: macOS 14.6
CPU: (16) arm64 Apple M3 Max
Memory: 145.11 MB / 64.00 GB
Shell:
version: "5.9"
path: /bin/zsh
Binaries:
Node:
version: 18.20.5
path: ~/.nvm/versions/node/v18.20.5/bin/node
Yarn:
version: 1.22.19
path: /usr/local/bin/yarn
npm:
version: 10.8.2
path: ~/.nvm/versions/node/v18.20.5/bin/npm
Watchman: Not Found
Managers:
CocoaPods:
version: 1.15.2
path: /Users/marcbourguignon/.rbenv/shims/pod
SDKs:
iOS SDK:
Platforms:
- DriverKit 24.1
- iOS 18.1
- macOS 15.1
- tvOS 18.1
- visionOS 2.1
- watchOS 11.1
Android SDK: Not Found
IDEs:
Android Studio: 2021.2 AI-212.5712.43.2112.8609683
Xcode:
version: 16.1/16B40
path: /usr/bin/xcodebuild
Languages:
Java:
version: 17.0.4.1
path: /Users/marcbourguignon/.sdkman/candidates/java/current/bin/javac
Ruby:
version: 2.7.5
path: /Users/marcbourguignon/.rbenv/shims/ruby
npmPackages:
"@react-native-community/cli":
installed: 15.1.3
wanted: ^15.1.3
react:
installed: 18.3.1
wanted: 18.3.1
react-native:
installed: 0.76.6
wanted: 0.76.6
react-native-macos: Not Found
npmGlobalPackages:
"*react-native*": Not Found
Android:
hermesEnabled: true
newArchEnabled: false
iOS:
hermesEnabled: true
newArchEnabled: false
Stacktrace or Logs
No crash; rendering bug
Reproducer
https://github.com/wen-kai/expo-sandbox/tree/scale-bug
Screenshots and Videos
Actual (IOS):
Expected (Android):
贡献指南
从这里开始
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- 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
- 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
从 reproducer 的 app/{tabs}/index.jsx 开始,使用 React Native 0.76.6 在 Paper 和 Fabric 中分别执行列出的 iOS 步骤。比较 iOS 与 Android 的结果,重点关注嵌套的逆缩放变换。完成标准是:iOS 子视图呈现为带蓝色边框的纯红色正方形,而不是模糊、像素化的视图。
由索引模型根据 Issue 内容生成。
评估
- 技术栈
- ios, javascript, react-native
- 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