react / react/react-native

TextInput with Large Font Size (>40) Causes Text to Become Invisible on iOS

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Component: TextInput Issue: Author Provided Repro Platform: iOS
Dominant language
C++
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Avg merge
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Merged PRs (30d)
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Description

Description

When using a TextInput component with a large fontSize (greater than 40), the text becomes invisible on iOS devices. This issue does not occur on Android, where the text is displayed correctly regardless of the font size. The problem is particularly evident when the text is long and the TextInput is set to multiline.

Steps to reproduce
  1. Create a new React Native project with the latest version.
  2. Add a TextInput component with multiline set to true.
  3. Set the fontSize of the TextInput to a value greater than 40.
  4. Provide a long string as the defaultValue or value for the TextInput.
  5. Run the app on an iOS device or simulator.
React Native Version

0.74.5

Affected Platforms

Runtime - iOS

Output of npx react-native info
System:
  OS: macOS 14.5
  CPU: (8) arm64 Apple M2
  Memory: 134.08 MB / 16.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 18.17.0
    path: ~/.nvm/versions/node/v18.17.0/bin/node
  Yarn:
    version: 3.6.4
    path: /opt/homebrew/bin/yarn
  npm:
    version: 9.6.7
    path: ~/.nvm/versions/node/v18.17.0/bin/npm
  Watchman:
    version: 2024.04.08.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.15.2
    path: /Users/enestatli/.rbenv/shims/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 23.5
      - iOS 17.5
      - macOS 14.5
      - tvOS 17.5
      - visionOS 1.2
      - watchOS 10.5
  Android SDK:
    API Levels:
      - "29"
      - "30"
      - "31"
      - "33"
      - "33"
      - "34"
    Build Tools:
      - 30.0.2
      - 30.0.3
      - 31.0.0
      - 33.0.0
      - 33.0.1
      - 33.0.2
      - 34.0.0
    System Images:
      - android-30 | Google APIs Intel x86 Atom
      - android-30 | Google Play ARM 64 v8a
      - android-33 | Google APIs ARM 64 v8a
      - android-34 | Google APIs ARM 64 v8a
    Android NDK: Not Found
IDEs:
  Android Studio: 2022.3 AI-223.8836.35.2231.10406996
  Xcode:
    version: 15.4/15F31d
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.9
    path: /usr/bin/javac
  Ruby:
    version: 2.7.6
    path: /Users/enestatli/.rbenv/shims/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 18.2.0
    wanted: 18.2.0
  react-native:
    installed: 0.74.5
    wanted: 0.74.5
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: false
iOS:
  hermesEnabled: true
  newArchEnabled: false
Stacktrace or Logs
-
Reproducer

https://snack.expo.dev/@enestatli65/quiet-orange-strawberries

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

Begin with the linked Snack reproducer and verify the behavior on an iOS device or simulator using a multiline TextInput, a fontSize above 40, and a long value. Investigate the iOS TextInput path; done means the text is visible at large sizes on iOS while the existing Android behavior remains unchanged.

Written by the indexing model from the issue text.

Assessment

Tech stack
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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