[iOS] Switch with a role that has no iOS trait stops being a switch to accessibility after it is disabled and re-enabled

Start by reading the accessibility trait update path in RCTViewComponentView and how RCTSwitchComponentView exposes its inner UISwitch as the accessibility element. Compare the traits on mount with those written after disabling and re-enabling a switch whose role maps to no iOS trait. Done when the role reported to accessibility remains consistent through that cycle; the issue provides a reproducer and observed accessibility tree to check.

Description

On iOS, a Switch whose role maps to no iOS accessibility trait, such as accessibilityRole="none" or accessibilityRole="checkbox", is reported to accessibility as a switch on mount. Once its accessibilityState.disabled goes from true back to false, it is reported as a generic element instead, and stays that way. A Switch with the default role stays a switch throughout.

The inner UISwitch is the Switch's accessibility element (RCTSwitchComponentView), and RCTViewComponentView writes the traits derived from the role and accessibilityState onto it only when they change:

1. On mount the derived traits are None, the same as the default, so nothing is written and the UISwitch keeps UIKit's own traits, including the switch trait.
2. When disabled, the derived traits are NotEnabled, which replaces UIKit's traits.
3. When enabled again, the derived traits go back to None. That now differs from the previous value, so 0 is written explicitly and UIKit's switch trait does not come back.

Expected: the Switch is reported with the same role before and after a disable and enable cycle. Whether that role should be UIKit's switch or the one the role asks for, it should not depend on whether the Switch has been disabled before.

Related: #59333 makes disabled set accessibilityState.disabled on iOS, as Android already does. With that change, toggling disabled alone also triggers this.

Steps to reproduce

1. Clone the reproducer, then cd ReproducerApp && npm install && (cd ios && bundle install && bundle exec pod install) and npx react-native run-ios.
2. Inspect the three switches with Accessibility Inspector: all three are switches.
3. Press "Disable switches", then "Enable switches".
4. Inspect them again: the role="none" and role="checkbox" switches are now generic elements. The default-role switch is still a switch.

The app renders:

<Switch value disabled={disabled} accessibilityState={{disabled}} />
<Switch value disabled={disabled} accessibilityRole="none" accessibilityState={{disabled}} />
<Switch value disabled={disabled} accessibilityRole="checkbox" accessibilityState={{disabled}} />

React Native Version

0.88.0

Affected Platforms

Runtime - iOS, Build - MacOS

Areas

Fabric - The New Renderer

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

System:
  OS: macOS 26.6.2
  CPU: (8) arm64 Apple M5 Pro (Virtual)
  Memory: 135.64 MB / 16.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 24.20.0
    path: ~/.fnm/bin/node
  Yarn:
    version: 1.22.22
    path: ~/.fnm/bin/yarn
  npm:
    version: 11.19.0
    path: ~/.fnm/bin/npm
  Watchman: Not Found
Managers:
  CocoaPods:
    version: 1.17.0
    path: /opt/homebrew/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 27.0
      - iOS 27.0
      - macOS 27.0
      - tvOS 27.0
      - visionOS 27.0
      - watchOS 27.0
  Android SDK: Not Found
IDEs:
  Android Studio: Not Found
  Xcode:
    version: 27.0/27A5228h
    path: /usr/bin/xcodebuild
Languages:
  Java: Not Found
  Ruby:
    version: 2.6.10
    path: /usr/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 20.2.0
    wanted: 20.2.0
  react:
    installed: 19.3.0
    wanted: 19.3.0
  react-native:
    installed: 0.88.0
    wanted: 0.88.0
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

No crash. Accessibility tree read with `axe describe-ui` (https://github.com/cameroncooke/AXe) on an iPhone 17 Pro simulator, iOS 27:

1. On mount
   role-default   CheckBox        role_description='switch'  enabled=True
   role-none      CheckBox        role_description='switch'  enabled=True
   role-checkbox  CheckBox        role_description='switch'  enabled=True
2. After "Disable switches"
   role-default   CheckBox        role_description='switch'  enabled=False
   role-none      GenericElement  role_description=''        enabled=False
   role-checkbox  GenericElement  role_description=''        enabled=False
3. After "Enable switches"
   role-default   CheckBox        role_description='switch'  enabled=True
   role-none      GenericElement  role_description=''        enabled=True
   role-checkbox  GenericElement  role_description=''        enabled=True

MANDATORY Reproducer

https://github.com/arun279/rn-switch-role-a11y-reproducer

Screenshots and Videos

Nothing visual: the switches look the same before and after. The difference is only in the accessibility tree (see the logs above).