react / react/react-native

iOS - borderStyle: 'dashed' and 'dotted' no longer works in combination with overflow: hidden in 0.76

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Issue: Author Provided Repro Platform: iOS Resolution: PR Submitted
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Description

Description

After upgrading to expo 52 and react-native 0.76.3 I noticed some of my dashed borders had disappeared in some cases on iOS. On further investigation, I discovered that dashed borders no longer work when borderStyle: "dashed" | "dotted" are used in combination with overflow: "hidden" or overflow: "scroll". Instead of a dashed or dotted border, it shows a solid border.
Dotted and dashed borders work correctly with overflow: "visible"
Dotted and dashed borders also work correctly in android.

I took a cursory look through the source code, but couldn't see the issue - that being said, if someone can point me in somewhat the right direction, I'd be happy to take a swing at a fix.

Steps to reproduce
  1. Install the application and launch ios emulator
  2. look at the code in the stylesheet for the two items
  3. look at the missing borderStyle
Screenshot 2024-12-03 at 12 27 00 PM
React Native Version

0.76.3

Affected Platforms

Runtime - iOS

Output of npx react-native info
info Fetching system and libraries information...
System:
  OS: macOS 14.5
  CPU: (16) x64 Intel(R) Core(TM) i7-10700K CPU @ 3.80GHz
  Memory: 181.07 MB / 16.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 18.19.0
    path: ~/.nvm/versions/node/v18.19.0/bin/node
  Yarn:
    version: 1.22.22
    path: /usr/local/bin/yarn
  npm:
    version: 10.2.3
    path: ~/.nvm/versions/node/v18.19.0/bin/npm
  Watchman:
    version: 4.9.0
    path: /usr/local/bin/watchman
Managers:
  CocoaPods:
    version: 1.10.0
    path: /usr/local/bin/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: 4.1 AI-201.8743.12.41.6953283
  Xcode:
    version: 16.1/16B40
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 18.0.1.1
    path: /usr/bin/javac
  Ruby:
    version: 2.6.10
    path: /usr/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 15.0.1
    wanted: 15.0.1
  react:
    installed: 18.3.1
    wanted: 18.3.1
  react-native:
    installed: 0.76.3
    wanted: 0.76.3
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: Not found
  newArchEnabled: false
Stacktrace or Logs
no logs
Reproducer

https://github.com/jorjordandan/borderIssue

Screenshots and Videos

No response

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 with the linked borderIssue reproducer and compare the iOS rendering of dashed and dotted borders under overflow: hidden or scroll versus visible. Trace the React Native iOS border-rendering path to identify why these cases become solid. Done means dashed and dotted borders render correctly with the affected overflow values without regressing Android or visible overflow behavior.

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
Mostly clear
Newbie friendliness
35/100

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