(RN 79.5) TextInput onContentSizeChange is not triggered on iOS

[Njaah-0]

Description

I noticed that after updating to 0.79.5, TextInput.onContentSizeChange is no longer triggered even if the multiline is set to true and input does growth properly. It is only triggered once, when the component mounts.

Steps to reproduce

1. Add any TextInput component with onContentSizeChange prop, eg. onContentSizeChange={() => Alert.alert('hello')}
2. Render the app with iOS-simulator
3. Press enter on input, nothing happens.

React Native Version

0.79.5

Affected Platforms

Runtime - iOS

Output of npx @react-native-community/cli info

info Fetching system and libraries information...
System:
  OS: macOS 14.6.1
  CPU: (8) arm64 Apple M1
  Memory: 150.19 MB / 16.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 20.18.1
    path: /usr/local/bin/node
  Yarn:
    version: 1.22.22
    path: ~/.npm-global/bin/yarn
  npm:
    version: 10.8.2
    path: /usr/local/bin/npm
  Watchman:
    version: 2025.04.14.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /opt/homebrew/lib/ruby/gems/3.0.0/bin/pod
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: 2024.1 AI-241.18034.62.2411.12071903
  Xcode:
    version: 16.2/16C5032a
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 22.0.1
    path: /usr/bin/javac
  Ruby:
    version: 3.4.2
    path: /opt/homebrew/opt/ruby/bin/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 19.0.0
    wanted: 19.0.0
  react-native:
    installed: 0.79.5
    wanted: 0.79.5
  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 v0.80.2 is now available (your project is running on v0.79.5).
info Changelog: https://github.com/facebook/react-native/releases/tag/v0.80.2
info Diff: https://react-native-community.github.io/upgrade-helper/?from=0.79.5&to=0.80.2
info For more info, check out "https://reactnative.dev/docs/upgrading?os=macos".

Stacktrace or Logs

None

MANDATORY Reproducer

https://snack.expo.dev/@njaah/textinput-issue?platform=ios

Screenshots and Videos

No response

[riteshshukla04]

Thanks for the bug, I was able to reproduce this on RN Tester.
Was this working on RN 0.78?

[nfmshow]

@riteshshukla04 I also started experiencing this problem after updating expo to v53. I don't know if it was working on 0.78 but it was definitely working on 0.76.9 which was the version I was using before the expo update.

[Njaah-0]

Thanks for the bug, I was able to reproduce this on RN Tester. Was this working on RN 0.78?

I am not sure about 0.78, my previous version was Expo 50 and I can't remember which RN version that uses. But it was definitely working back then.

[Njaah-0]

Also, in case someone is struggling with this issue, you can quite easily overcome it with the help of the onLayout prop, which is still triggered correctly.

react-native-gifted-chat is affected by this issue, as it doesn't report composer height correctly.

[nfmshow]

@Njaah-0 Thanks 🙏

[deepak9705]

it reproducible on latest react-native version 0.81.0

[sunujun]

I believe this will be helpful to you: #50782

[cmhac]

I am also experiencing this issue with 0.81.1. @Njaah-0 can you elaborate on how onLayout fixes this? On my end it looks like that is also not firing on ios.

[uen]

@cmhac

You can render Text with the same fontSize & lineHeight & width and use onLayout to set the height of the input