react / react/react-native

Touch events cause zIndex to be invalid on Android and iOS

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#50,589 5 comments 0 reactions 0 assignees View on GitHub

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Issue: Author Provided Repro
Dominant language
C++
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Forks
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Avg merge
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Merged PRs (30d)
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Description

Description

When the parent node is bound with touch-related events, such as onTouchStart and onTouchEnd, it causes the zIndex set on the child nodes to become ineffective.
This issue occurs on both Android and iOS.

Steps to reproduce
  1. Install the application
  2. Cd ReproducerApp and run npm ci
  3. npx react-native run-ios or npx react-native run-android
  4. Then you can see that the node with the zIndex setting is ineffective and still covered by other nodes. If the touch events on the parent node are removed, the zIndex becomes effective
React Native Version

0.77.1 、0.79.0

Affected Platforms

Runtime - Android, Runtime - iOS

Output of npx @react-native-community/cli info
System:
  OS: macOS 14.2.1
  CPU: (8) x64 Apple M3
  Memory: 86.66 MB / 16.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 20.11.1
    path: ~/.nvm/versions/node/v20.11.1/bin/node
  Yarn:
    version: 1.22.22
    path: /usr/local/bin/yarn
  npm:
    version: 10.2.4
    path: ~/.nvm/versions/node/v20.11.1/bin/npm
  Watchman:
    version: 2024.10.21.00
    path: /usr/local/bin/watchman
Managers:
  CocoaPods:
    version: 1.15.2
    path: /usr/local/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 23.4
      - iOS 17.4
      - macOS 14.4
      - tvOS 17.4
      - visionOS 1.1
      - watchOS 10.4
  Android SDK: Not Found
IDEs:
  Android Studio: 2023.3 AI-233.14808.21.2331.11709847
  Xcode:
    version: 15.3/15E204a
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.11
    path: /usr/bin/javac
  Ruby:
    version: 3.1.0
    path: /Users/didi/.rbenv/shims/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 18.0.0
    wanted: 18.0.0
  react:
    installed: 19.0.0
    wanted: 19.0.0
  react-native:
    installed: 0.79.0
    wanted: 0.79.0
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true
Stacktrace or Logs
no log
Reproducer

https://github.com/yandadaFreedom/RN-bug-repo/tree/bug-zindex

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 by running the linked RN-bug-repo reproducer from the bug-zindex branch with npm ci and the Android or iOS command. Compare the layout with and without the parent touch handlers, then trace the React Native mobile rendering and touch behavior involved; done means the child zIndex remains effective on both platforms when those handlers are present.

Written by the indexing model from the issue text.

Assessment

Tech stack
android, 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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