react / react/react-native

iOS border radius not working when using transparent border color

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Issue: Author Provided Repro Needs: Triage :mag: Newer Patch Available Platform: iOS
Dominant language
C++
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Description

Description

iOS border radius not working when using transparent border color

React Native Version

0.72.5

Output of npx react-native info

System:
OS: macOS 13.0
CPU: (12) x64 Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz
Memory: 2.30 GB / 16.00 GB
Shell:
version: 5.8.1
path: /bin/zsh
Binaries:
Node:
version: 16.15.1
path: ~/.nvm/versions/node/v16.15.1/bin/node
Yarn:
version: 1.21.1
path: /usr/local/bin/yarn
npm:
version: 8.11.0
path: ~/.nvm/versions/node/v16.15.1/bin/npm
Watchman: Not Found
Managers:
CocoaPods:
version: 1.11.3
path: /Users/erich/.rvm/gems/ruby-2.7.5/bin/pod
SDKs:
iOS SDK:
Platforms:
- DriverKit 22.1
- iOS 16.1
- macOS 13.0
- tvOS 16.1
- watchOS 9.1
Android SDK: Not Found
IDEs:
Android Studio: 2022.2 AI-222.4459.24.2221.10121639
Xcode:
version: 14.1/14B47b
path: /usr/bin/xcodebuild
Languages:
Java:
version: 11.0.16.1
path: /usr/local/opt/openjdk@11/bin/javac
Ruby:
version: 2.7.5
path: /Users/erich/.rvm/rubies/ruby-2.7.5/bin/ruby
npmPackages:
"@react-native-community/cli": Not Found
react:
installed: 18.2.0
wanted: 18.2.0
react-native:
installed: 0.72.5
wanted: 0.72.5
react-native-macos: Not Found
npmGlobalPackages:
"react-native": Not Found
Android:
hermesEnabled: Not found
newArchEnabled: Not found
iOS:
hermesEnabled: Not found
newArchEnabled: Not found

Steps to reproduce
  1. Add a parent container with transparent border color, border radius and overflow: hidden set
      <View
        style={{
          margin: 150,
          borderWidth: 4,
          borderColor: 'transparent',
          borderRadius: 16,
          overflow: 'hidden',
          height: 80,
          width: 60,
        }}>
        <View
          style={{
            width: '100%',
            height: '100%',
            backgroundColor: 'red',
          }}></View>
      </View>
  1. On iOS, the child view is not clipped by the parent container.
Snack, screenshot, or link to a repository

See snack: https://snack.expo.dev/@eh2077/4c412a?platform=ios

Screenshot 2023-10-14 at 1 35 18 PM Screenshot 2023-10-14 at 1 30 03 PM

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by running the linked Snack on iOS with React Native 0.72.5 and compare the transparent-border case with the screenshots. Trace the iOS view clipping and border-radius behavior; done means the child is clipped to the rounded parent even when the border color is transparent.

Written by the indexing model from the issue text.

Assessment

Tech stack
ios, react-native
Domain
mobile
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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