[IOS] there is an extra tiny line when set border and border-radius to a View

[zarin-maruf]

Description

When I add a border and border-radius to a View, an extra tiny line with the same color as the View background is created. This line will be explicitly visible when you set the background and border to the same color.

This happens on IOS only btw.

Steps to reproduce

1. add the following code to your component you can see the issue

<View style={{ width: 200, height: 200, backgroundColor: 'white', padding: 20 }}>
      <View
       style={{
         width: 30,
         height: 30,
         backgroundColor: 'blue',
         borderRadius: 50,
         borderWidth: 5,
         borderColor: 'white',
         borderStyle: 'solid',
       }}
      />
   </View>

React Native Version

0.76.5

Affected Platforms

Runtime - iOS, Build - MacOS

Output of npx @react-native-community/cli info

System:
  OS: macOS 13.7.3
  CPU: (8) x64 Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz
  Memory: 2.30 GB / 16.00 GB
  Shell:
    version: 3.2.57
    path: /bin/bash
Binaries:
  Node:
    version: 22.0.0
    path: ~/.nvm/versions/node/v22.0.0/bin/node
  Yarn:
    version: 4.5.0
    path: ~/.nvm/versions/node/v22.0.0/bin/yarn
  npm:
    version: 10.5.1
    path: ~/.nvm/versions/node/v22.0.0/bin/npm
  Watchman:
    version: 2024.11.04.00
    path: /usr/local/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /usr/local/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 23.2
      - iOS 17.2
      - macOS 14.2
      - tvOS 17.2
      - visionOS 1.0
      - watchOS 10.2
  Android SDK: Not Found
IDEs:
  Android Studio: 2022.3 AI-223.8836.35.2231.10811636
  Xcode:
    version: 15.2/15C500b
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.13
    path: /Library/Java/JavaVirtualMachines/openjdk-17.jdk/Contents/Home/bin/javac
  Ruby:
    version: 2.6.10
    path: /usr/bin/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react: Not Found
  react-native: Not Found
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

info React Native v0.78.0 is now available (your project is running on v0.76.7).
info Changelog: https://github.com/facebook/react-native/releases/tag/v0.78.0
info Diff: https://react-native-community.github.io/upgrade-helper/?from=0.76.7&to=0.78.0
info For more info, check out "https://reactnative.dev/docs/upgrading?os=macos".

Stacktrace or Logs

Not Set

Reproducer

https://codesandbox.io/p/live/38941380-ed25-44a0-afae-83260029f2c1

Screenshots and Videos

[react-native-bot]

Tip

Newer version available: You are on a supported minor version, but it looks like there's a newer patch available - 0.76.7. Please upgrade to the highest patch for your minor or latest and verify if the issue persists (alternatively, create a new project and repro the issue in it). If it does not repro, please let us know so we can close out this issue. This helps us ensure we are looking at issues that still exist in the most recent releases.

[react-native-bot]

Warning

Missing reproducer: We could not detect a reproducible example in your issue report. Please provide either:

• If your bug is UI related: a Snack
• If your bug is build/upgrade related: a project using our Reproducer Template
• Otherwise send us a Pull Request with the RNTesterPlayground.js edited to reproduce your bug.

[react-native-bot]

Tip

Newer version available: You are on a supported minor version, but it looks like there's a newer patch available - undefined. Please upgrade to the highest patch for your minor or latest and verify if the issue persists (alternatively, create a new project and repro the issue in it). If it does not repro, please let us know so we can close out this issue. This helps us ensure we are looking at issues that still exist in the most recent releases.

[cortinico]

Does this happen on both old and new arch?

[zarin-maruf]

Does this happen on both old and new arch?

Yes, it does.

[cortinico]

codesandbox.io/p/live/38941380-ed25-44a0-afae-83260029f2c1

@zarin-maruf can you provide either a Snack or a reproducer using https://github.com/react-native-community/reproducer-react-native ?

[zarin-maruf]

@cortinico This is the reproducer repo link.

https://github.com/zarin-maruf/react-native-view-extra-tiny-line-on-ios