[jeltehomminga]

Summary:

Hi, I'm a React Native developer. Thanks for the recent iOS accessibility work.

On iOS, role="slider" ends up with no accessibility traits, so VoiceOver doesn't treat the view as adjustable. accessibilityRole="adjustable" on the same view works. The traits come from fromString(const std::string &, AccessibilityTraits &) in accessibilityPropsConversions.h, which has an "adjustable" case but no "slider" case.

Before the ARIA roles moved to native in #37309, the JS mapping turned role: 'slider' into accessibilityRole: 'adjustable', so this used to work. The native table maps slider to no trait instead. This adds slider to the adjustable case, the same way img/image and heading/header share a case. Android doesn't read accessibilityTraits, so only iOS changes.

It only touches slider. The other roles listed in #50123 stay as they are, since the comment above RCTViewIsInteractiveAccessibilityElement says some of them carry no trait on purpose. I also left the legacy RCTViewManager.m table alone, which maps slider to UIAccessibilityTraitNone as well. Happy to change that one too if it's still wanted.

Part of #50123.

Changelog:

[IOS] [FIXED] - role="slider" now gets the adjustable accessibility trait, like accessibilityRole="adjustable"

Test Plan:

RNTester on an iPhone 18 Pro simulator (iOS 27.0), with the Playground rendering:

<View accessible role="slider" accessibilityLabel="Role slider" accessibilityValue={{min: 0, max: 10, now: 5}} />
<View accessible accessibilityRole="adjustable" accessibilityLabel="AccessibilityRole adjustable" accessibilityValue={{min: 0, max: 10, now: 5}} />

The simulator's accessibility tree for both views:

main     Role slider                   AXGroup       traits: none
         AccessibilityRole adjustable  AXAdjustable  traits: adjustable
this PR  Role slider                   AXAdjustable  traits: adjustable
         AccessibilityRole adjustable  AXAdjustable  traits: adjustable

• Added derives_adjustable_trait_from_slider_role to AccessibilityPropsTest.cpp, next to derives_traits_from_role. I couldn't run it, because I didn't find a way to run the ReactCommon gtests from the open-source checkout.
• node scripts/clang-format.js --check passes on both files.
• Not checked: the legacy architecture.

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[Copilot]

🟢 Approval recommended

The narrow mapping change follows the existing conversion pattern and includes a focused regression test; native tests were not executed during review.

No open issues 🎉

What changed in this PR

This PR restores the iOS adjustable accessibility trait for role="slider" in Fabric, addressing the slider portion of #50123 without changing other role mappings or the legacy architecture.

Changes:

• Maps slider to AccessibilityTraits::Adjustable, alongside adjustable.
• Adds a regression test for trait derivation from role="slider".

File	Description
packages/​react-native/​ReactCommon/​react/​renderer/​components/​view/​tests/​AccessibilityPropsTest.cpp	Adds a slider-role regression test.
packages/​react-native/​ReactCommon/​react/​renderer/​components/​view/​accessibilityPropsConversions.h	Maps slider to the adjustable trait.

_{Review effort: Balanced}

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