iOS Accessibility Value Out of Sync

Description

On iOS it seems that after an accessibility action is triggered the value of accessibility value is read an arbitrary amount of time later. This can lead to VoiceOver reading the previous value again rather than the new value.

This means that sometimes the value will be read correctly, depending on how quickly react native renders the updated accessibility action.

However in my moderately complex RN project I was unable to reliably get everything rendering quickly enough. Even when Flipper said the component in question was rendering in a few ms the bug would still sometimes occur (about 1 in 20 actions).

Note: On Android, TalkBack waits any length of time before reading the updated value. Even an artificial of delay of 500ms will still be read correctly.

Version

0.68.5

Output of npx react-native info

System:
OS: macOS 12.6
CPU: (16) x64 Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz
Memory: 37.62 MB / 32.00 GB
Shell: 5.8.1 - /bin/zsh
Binaries:
Node: 18.12.1 - ~/.nvm/versions/node/v18.12.1/bin/node
Yarn: 1.22.10 - /usr/local/bin/yarn
npm: 8.19.2 - ~/.nvm/versions/node/v18.12.1/bin/npm
Watchman: 2022.06.06.00 - /usr/local/bin/watchman
Managers:
CocoaPods: 1.11.3 - /usr/local/bin/pod
SDKs:
iOS SDK:
Platforms: DriverKit 22.2, iOS 16.2, macOS 13.1, tvOS 16.1, watchOS 9.1
Android SDK:
API Levels: 30, 31
Build Tools: 30.0.2, 31.0.0, 33.0.1
System Images: android-24 | Google APIs Intel x86 Atom, android-30 | Google APIs Intel x86 Atom, android-30 | Google Play Intel x86 Atom, android-31 | Google APIs Intel x86 Atom_64, android-31 | Google Play Intel x86 Atom_64
Android NDK: Not Found
IDEs:
Android Studio: 2021.3 AI-213.7172.25.2113.9123335
Xcode: 14.2/14C18 - /usr/bin/xcodebuild
Languages:
Java: 18.0.1 - /usr/bin/javac
npmPackages:
@react-native-community/cli: Not Found
react: 17.0.2 => 17.0.2
react-native: 0.68.5 => 0.68.5
react-native-macos: Not Found
npmGlobalPackages:
react-native: Not Found

Steps to reproduce

Accessible components with the following properties:

• accessibleRole="adjustable"
• accessibilityActions for increment and decrement
• accessibilityValue with text property set

In an app where the component is not guaranteed to render quickly enough.

Running with VoiceOver on iOS (Reading speed didn't seem to change the issue)

Snack, code example, screenshot, or link to a repository

https://snack.expo.dev/@scarlin/ios-accessibility-value-bug-demo

Bắt đầu bằng cách chạy bản tái hiện Snack được liên kết với VoiceOver và tập trung vào các component có thể điều chỉnh sử dụng accessibilityActions cùng thuộc tính văn bản accessibilityValue. Theo dõi cách React Native xử lý action trợ năng của iOS và việc cập nhật giá trị tiếp theo; hoàn thành khi VoiceOver đọc đáng tin cậy giá trị đã cập nhật sau các action tăng và giảm.