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onTextLayout incorrectly returns multiple lines for text that renders in a single line #54552
Description
Description
onTextLayout is returning incorrect lines data for simple single-line text.
In previous React Native versions (tested on Expo 52 with react-native 0.79), the lines array matched the actual number of rendered lines. After the latest update (RN 0.81), some texts that clearly render in one line are reported as two lines.
This breaks logic that depends on overflow detection (e.g., switching between normal text and marquee scrolling). Because onTextLayout now gives false positives, it’s impossible to reliably detect when text exceeds one line.
Steps to reproduce
The bug is present in Expo template when created with npx create-expo-app@latest.
- Install the dependencies
npm install - Open the app in Expo Go application
- See the log in terminal. You should see the text is rendered in one line, but
onTextLayoutgives an array with 2 items.
React Native Version
0.81.5
Affected Platforms
Runtime - Android
Output of npx @react-native-community/cli info
System:
OS: macOS 26.1
CPU: (11) arm64 Apple M3 Pro
Memory: 286.83 MB / 18.00 GB
Shell:
version: 3.2.57
path: /bin/sh
Binaries:
Node:
version: 22.12.0
path: /Users/smhd/.nvm/versions/node/v22.12.0/bin/node
Yarn: Not Found
npm:
version: 10.9.0
path: /Users/smhd/.nvm/versions/node/v22.12.0/bin/npm
Watchman:
version: 2024.12.02.00
path: /opt/homebrew/bin/watchman
Managers:
CocoaPods: Not Found
SDKs:
iOS SDK:
Platforms:
- DriverKit 24.2
- iOS 18.2
- macOS 15.2
- tvOS 18.2
- visionOS 2.2
- watchOS 11.2
Android SDK: Not Found
IDEs:
Android Studio: 2025.1 AI-251.26094.121.2513.14007798
Xcode:
version: 16.2/16C5032a
path: /usr/bin/xcodebuild
Languages:
Java:
version: 17.0.14
path: /usr/bin/javac
Ruby:
version: 2.6.10
path: /usr/bin/ruby
npmPackages:
"@react-native-community/cli": Not Found
react:
installed: 19.1.0
wanted: 19.1.0
react-native:
installed: 0.81.5
wanted: 0.81.5
react-native-macos: Not Found
npmGlobalPackages:
"*react-native*": Not Found
Android:
hermesEnabled: Not found
newArchEnabled: Not found
iOS:
hermesEnabled: Not found
newArchEnabled: Not found
info React Native v0.82.1 is now available (your project is running on v0.81.5).
info Changelog: https://github.com/facebook/react-native/releases/tag/v0.82.1
info Diff: https://react-native-community.github.io/upgrade-helper/?from=0.81.5&to=0.82.1
info For more info, check out "https://reactnative.dev/docs/upgrading?os=macos".
Stacktrace or Logs
No stacktrace available. Not related in this case.
MANDATORY Reproducer
https://github.com/SMhdAsadi/onTextLayout-issue-rn81
Screenshots and Videos
This is the first page of a new Expo project in default template:
The title "Welcome!" is rendered in one line, but is reported to be in two lines in onTextLayout prop.
Activity
IslamRustamov commentedon Nov 16, 2025
created clean app with npx create-expo-app@latest and didn't reproduce the issue, maybe you can show what was logged in console?
SMhdAsadi commentedon Nov 17, 2025
Sure. It produces two values in the array like this:
Actually this is the entire
e.nativeEvent.linescontent:And for more info, this is the dimensions of emulator I use for testing:
Thotaharshavardhani commentedon Nov 24, 2025
Hello @SMhdAsadi , I was able to reproduce the issue. onTextLayout is returning two lines for text that visually renders in a single line on Expo/RN 0.81+. Thanks for reporting!
gigobyte commentedon Jan 22, 2026
I was able to reproduce it with a much smaller example on RN 0.81.4:
salmabs commentedon Jan 27, 2026
+1
Fix onTextLayout reporting incorrect lines in EXACTLY width mode on A…
Fix onTextLayout reporting incorrect lines in EXACTLY width mode on A…
dexical30 commentedon Apr 4, 2026
I tracked this down and opened a PR with a proposed fix:
The issue appears to come from using
floor(width)when building the measurementStaticLayoutforonTextLayouton Android. In some cases this makes the measurement layout 1px narrower than the rendered layout, which leads to incorrect line splitting being reported.Would appreciate any review or feedback.
SimonWithoutGarfunkle commentedon Apr 28, 2026
+1
same issue
"hello" is displayed on two lines, but "hello test" and "Hello", which are longer, are correctly displayed on one line.
LOG [chat][hello][textLayout] 287 {"linesCount": 2, "linesText": ["hell", "o"]}
thank you for the fix @dexical30 hope it will be added soon !
gigobyte commentedon Oct 16, 2026
For anyone wondering - this has been fixed in v0.86.0 - 90c2c59
This issue can be closed.