React Native 0.79 iOS regression for RCTWindowFrameDidChangeNotification

[jpudysz]

Description

Hello,

I've noticed a regression in the RCTWindowFrameDidChangeNotification event on iOS when using React Native 0.79. The event no longer fires, as reported in #47234

This issue only occurs with the newest release. I also found this PR #49162 which may be related.

Steps to reproduce

1. Install repro
2. Run the example on iOS simulator via Xcode
3. Toggle theme change / content size category change / screen orientation change etc.
4. Observe no "Called!" log in the console

React Native Version

0.79.0

Affected Platforms

Runtime - iOS

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

System:
  OS: macOS 15.3.2
  CPU: (12) arm64 Apple M3 Pro
  Memory: 818.44 MB / 36.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 23.5.0
    path: /opt/homebrew/bin/node
  Yarn:
    version: 1.22.22
    path: /opt/homebrew/bin/yarn
  npm:
    version: 10.9.2
    path: /opt/homebrew/bin/npm
  Watchman:
    version: 2024.12.02.00
    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:
    API Levels:
      - "23"
      - "28"
      - "29"
      - "30"
      - "33"
      - "34"
      - "35"
    Build Tools:
      - 30.0.3
      - 34.0.0
      - 35.0.0
    System Images:
      - android-23 | ARM 64 v8a
      - android-24 | Google APIs ARM 64 v8a
      - android-26 | Google APIs ARM 64 v8a
      - android-28 | ARM 64 v8a
      - android-29 | ARM 64 v8a
      - android-30 | ARM 64 v8a
      - android-30 | Google APIs ARM 64 v8a
      - android-34 | Android TV ARM 64 v8a
      - android-34 | ARM 64 v8a
      - android-34 | Google APIs ARM 64 v8a
      - android-35 | Google APIs ARM 64 v8a
      - android-35 | Google Play ARM 64 v8a
    Android NDK: Not Found
IDEs:
  Android Studio: 2024.3 AI-243.22562.218.2431.12996373
  Xcode:
    version: 16.3/16E140
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.11
    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: 0.79.0
    wanted: 0.79.0
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

No crash

Reproducer

https://github.com/jpudysz/RN079-repro

Screenshots and Videos

RN 0.78.2:

Screen.Recording.2025-04-10.at.12.43.05.mov

RN 0.79.0:

Screen.Recording.2025-04-10.at.12.40.46.mov

[cortinico]

I've noticed a regression in the RCTWindowFrameDidChangeNotification event on iOS when using React Native 0.79. The event no longer fires, as reported in #47234

@jpudysz just to understand, are you saying that the issue regressed again, as it was fixed in 0.77/0.78 but regressed once more?
Or was it broken since 0.76?

[jpudysz]

It worked from version 0.76.2 but broke again in 0.79.0

[cortinico]

@cipolleschi do you have context on this one?

[migueldaipre]

For some reason version 0.79 does not contain the fix made in this commit.

0.78.2 vs 0.79.0

[cortinico]

Great find @migueldaipre. That's because:

• feat(ios): encapsulate device info listeners #49162

Got applied on top. Perhaps @okwasniewski or @cipolleschi can shed some light here?

[cipolleschi]

The context is that, in the effort of decoupling react native from the App Delegate and toward supporting the SceneDelegate, we were refactoring the observers for those events.

I don't think the delegate is the right fix, as we were changing the mechanism that emit the event. We might have missed a spot.

@okwasniewski can you look into it?