react / react/react-native

[TextInput] lineheight cuts off content on iOS

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Component: TextInput Issue: Author Provided Repro Newer Patch Available Platform: iOS
Dominant language
C++
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Description

Description

The TextInput on iOS cuts off content at dashes (-) if it has the lineHeight style applied to it. This happens when content is to long and therefore isn't completely visible in the input without moving through it.

If the lineHeight isn't applied it is not cut off at the dash (-) and the content will end with ellipsis (...).

We tried removing everything from the input and found out in that way it was the lineHeight that causes this issue.

This only happens on iOS and not on Android.

React Native Version

0.71.13

Output of npx react-native info
System:
    OS: macOS 14.0
    CPU: (10) arm64 Apple M1 Pro
    Memory: 55.56 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 18.15.0 - ~/.nvm/versions/node/v18.15.0/bin/node
    Yarn: 1.22.19 - /opt/homebrew/bin/yarn
    npm: 9.5.0 - ~/.nvm/versions/node/v18.15.0/bin/npm
    Watchman: 2023.10.02.00 - /opt/homebrew/bin/watchman
  Managers:
    CocoaPods: 1.13.0 - /Users/thomaslamars/.rvm/gems/ruby-2.7.5/bin/pod
  SDKs:
    iOS SDK:
      Platforms: DriverKit 23.0, iOS 17.0, macOS 14.0, tvOS 17.0, watchOS 10.0
    Android SDK: Not Found
  IDEs:
    Android Studio: 2022.2 AI-222.4459.24.2221.9971841
    Xcode: 15.0.1/15A507 - /usr/bin/xcodebuild
  Languages:
    Java: 18.0.2.1 - /Library/Java/JavaVirtualMachines/jdk-18.0.2.1.jdk/Contents/Home/bin/javac
  npmPackages:
    @react-native-community/cli: Not Found
    react: 18.2.0 => 18.2.0 
    react-native: ^0.71.13 => 0.71.13 
    react-native-macos: Not Found
  npmGlobalPackages:
    *react-native*: Not Found
Steps to reproduce

It is reproducible by making an TextInput with just lineHeight on it with the styling.
Than as value pass a really long string or type a really long string with dashes.
Get out of focus with the input and see that the value in the input gets truncated.

import { TextInput, SafeAreaView, StyleSheet } from 'react-native';

export default function App() {
  const value = "Thisisareallylong emailwithdashes-init@thawdisisasnackwhichisanexample.com"

  return (
    <SafeAreaView style={styles.container}>
      <TextInput value={value} style={{ lineHeight: 20 }} />
    </SafeAreaView>
  );
}
Snack, screenshot, or link to a repository
Snack url

Reproducible on Snack with expo 49 and react native version 0.72.4
https://snack.expo.dev/l0o3kNldL

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 by running the linked Snack reproduction with the long dashed value and compare the iOS TextInput behavior with and without lineHeight. Trace the iOS TextInput entry point responsible for rendering and truncation, then verify that long content no longer cuts off at dashes while Android behavior remains unchanged.

Written by the indexing model from the issue text.

Assessment

Tech stack
ios, react-native
Domain
mobile
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Active
Clarity
Mostly clear
Newbie friendliness
48/100

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