react / react/react-native

Accessibility Issue: Dynamic type fontsizes are unsupported

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#51,612 7 comments 2 reactions 0 assignees View on GitHub

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Dominant language
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Description

Description

We are trying to fix all accessibility issues on our app, and noticed this warning with textinput with iOS Accessibility Inspector while running on audit

allowFontScaling={true} has no effect on this warning

<View style={{flex: 1, backgroundColor: '#fff'}}> <TextInput style={{padding: 20}} placeholder="Type here..." allowFontScaling={true}></TextInput> </View> </View>

How can we remove this warning?

Steps to reproduce
  1. Run the below sample application on iOS simulator or a real device
  2. Select 'Accessibility inspector' from Xcode developer tools
  3. Run an audit on the screen
  4. Will get the below error for text input
    " Dynamic Text font sizes are unsupported. User will not be able to change the font size of this element"

Is there anything missing here?

React Native Version

0.79.2

Affected Platforms

Runtime - iOS

Output of npx @react-native-community/cli info
System:
  OS: macOS 15.5
  CPU: (11) arm64 Apple M3 Pro
  Memory: 113.31 MB / 18.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 20.15.1
    path: ~/.nvm/versions/node/v20.15.1/bin/node
  Yarn:
    version: 1.22.22
    path: /opt/homebrew/bin/yarn
  npm:
    version: 10.7.0
    path: ~/.nvm/versions/node/v20.15.1/bin/npm
  Watchman:
    version: 2025.02.10.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /opt/homebrew/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 24.4
      - iOS 18.4
      - macOS 15.4
      - tvOS 18.4
      - visionOS 2.4
      - watchOS 11.4
  Android SDK: Not Found
IDEs:
  Android Studio: 2024.1 AI-241.18034.62.2411.12071903
  Xcode:
    version: 16.3/16E140
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.12
    path: /usr/bin/javac
  Ruby:
    version: 2.6.10
    path: /usr/bin/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: 0.79.2
    wanted: 0.79.2
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true
Stacktrace or Logs
NA
MANDATORY Reproducer

https://github.com/anoopmm/accessibility.git

Screenshots and Videos

Image

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 mandatory reproducer and run its TextInput example through the iOS Accessibility Inspector audit described in the issue. Trace how React Native 0.79.2 handles allowFontScaling for iOS TextInput, then verify that the reported Dynamic Text font sizes warning is resolved without regressing the sample behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
react-native
Domain
accessibility, mobile
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
38/100

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