Description
I found that on v0.85 that this callback on RCTHostDelegate (void)host:(RCTHost*)host didInitializeRuntime:(Runtime&)rt doesn't get invoked at all on app startup. Further investigation have found that the RCTReactNativeFactory class is set to be the RCTHost's delegate but the RCTReactNativeFactory class itself doesn't have the method host:didInitializeRuntime: defined on it.
This makes the delegate itself useless unless i created a subclass of RCTReactNativeFactory to implement the missing method.
We use this method as a mean to store the runtime passed for any JSI calls to be made on the native side to the Javascript side
@implementation ReactNativeDelegate
#pragma mark - RCTHostDelegate
- (void)host:(RCTHost*)host didInitializeRuntime:(Runtime&)rt {
//This callback is not invoked
...
}
@end
@Implementation AppDelegate
- (BOOL)application:(UIApplication*)application
didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
...
ReactNativeDelegate* delegate = [ReactNativeDelegate new]; //RCTHostDelegate inheritor
RCTReactNativeFactory* factory =
[[RCTReactNativeFactory alloc] initWithDelegate:delegate
releaseLevel:releaseLevel];
self.reactNativeDelegate = delegate;
self.reactNativeFactory = factory;
...
}
...
@end
Steps to reproduce
Just startup the app on iOS or tvOS
React Native Version
0.85
Affected Platforms
Runtime - iOS
Output of npx @react-native-community/cli info
pp696r@DTVFXLVYH62M6 ios % npx @react-native-community/cli info
info Fetching system and libraries information...
System:
OS: macOS 26.5
CPU: (18) arm64 Apple M5 Pro
Memory: 63.41 MB / 48.00 GB
Shell:
version: "5.9"
path: /bin/zsh
Binaries:
Node:
version: 24.13.0
path: ~/.nvm/versions/node/v24.13.0/bin/node
Yarn:
version: 4.10.3
path: ~/.nvm/versions/node/v24.13.0/bin/yarn
npm:
version: 11.6.2
path: ~/.nvm/versions/node/v24.13.0/bin/npm
Watchman: Not Found
Managers:
CocoaPods:
version: 1.13.0
path: /Users/pp696r/.rbenv/shims/pod
SDKs:
iOS SDK:
Platforms:
- DriverKit 25.2
- iOS 26.2
- macOS 26.2
- tvOS 26.2
- visionOS 26.2
- watchOS 26.2
Android SDK: Not Found
IDEs:
Android Studio: 2025.3 AI-253.32098.37.2534.15336583
Xcode:
version: 26.2/17C52
path: /usr/bin/xcodebuild
Languages:
Java:
version: 22.0.1
path: /usr/bin/javac
Ruby:
version: 2.7.5
path: /Users/pp696r/.rbenv/shims/ruby
npmPackages:
"@react-native-community/cli": Not Found
react: Not Found
react-native: Not Found
react-native-macos: Not Found
npmGlobalPackages:
"*react-native*": Not Found
Android:
hermesEnabled: true
newArchEnabled: true
iOS:
hermesEnabled: true
newArchEnabled: true
info React Native v0.86.0 is now available (your project is running on v0.85.3).
info Changelog: https://github.com/facebook/react-native/releases/tag/v0.86.0
info Diff: https://react-native-community.github.io/upgrade-helper/?from=0.85.3&to=0.86.0
info For more info, check out "https://reactnative.dev/docs/upgrading?os=macos".
Stacktrace or Logs
MANDATORY Reproducer
NA
Screenshots and Videos
No response
Description
I found that on v0.85 that this callback on RCTHostDelegate (void)host:(RCTHost*)host didInitializeRuntime:(Runtime&)rt doesn't get invoked at all on app startup. Further investigation have found that the RCTReactNativeFactory class is set to be the RCTHost's delegate but the RCTReactNativeFactory class itself doesn't have the method host:didInitializeRuntime: defined on it.
This makes the delegate itself useless unless i created a subclass of RCTReactNativeFactory to implement the missing method.
We use this method as a mean to store the runtime passed for any JSI calls to be made on the native side to the Javascript side
Steps to reproduce
Just startup the app on iOS or tvOS
React Native Version
0.85
Affected Platforms
Runtime - iOS
Output of
npx @react-native-community/cli infoStacktrace or Logs
MANDATORY Reproducer
NA
Screenshots and Videos
No response