25harsh
cf598f523b
Summary:
<!-- Explain the **motivation** for making this change. What existing problem does the pull request solve? -->
Fixes a crash in `RCTDeviceInfo.interfaceOrientationDidChange` when `application.delegate.window` is nil. This crash affects multiple modern iOS app architectures where the traditional window property may not be set:
- **SwiftUI apps using `main`** instead of traditional AppDelegate
- **Brownfield React Native integrations** where the host app manages windows
- **Scene-based lifecycle apps** (iOS 13+) using SceneDelegate
- **Custom window management** setups
**The Problem:**
```
*** Terminating app due to uncaught exception 'NSInvalidArgumentException',
reason: '-[MyApp.AppDelegate window]: unrecognized selector sent to instance'
```
This occurs when trying to access `.frame` on a nil window object during orientation changes. Modern iOS development patterns don't always require setting `application.delegate.window`, but React Native's RCTDeviceInfo assumes this property exists.
**The Solution:**
Replace direct `application.delegate.window` access with `RCTKeyWindow()` and add nil-safe fallback:
```objc
// Before (crashes in modern apps)
BOOL isRunningInFullScreen =
CGRectEqualToRect(application.delegate.window.frame, application.delegate.window.screen.bounds);
// After (safe for all app configurations)
UIWindow *delegateWindow = RCTKeyWindow();
BOOL isRunningInFullScreen = delegateWindow ?
CGRectEqualToRect(delegateWindow.frame, delegateWindow.screen.bounds) : YES;
```
This approach:
- Uses `RCTKeyWindow()` pattern already established elsewhere in RCTDeviceInfo
- Provides safe fallback defaulting to fullscreen when window state is unknown
- Maintains existing multitasking detection behavior (Split View, Slide Over)
- Is backward compatible with traditional React Native apps
## Changelog:
<!-- Help reviewers and the release process by writing your own changelog entry.
Pick one each for the category and type tags:
[ANDROID|GENERAL|IOS|INTERNAL] [BREAKING|ADDED|CHANGED|DEPRECATED|REMOVED|FIXED|SECURITY] - Message
For more details, see:
https://reactnative.dev/contributing/changelogs-in-pull-requests
-->
[IOS][FIXED] - Fix RCTDeviceInfo crash when application.delegate.window is nil in modern iOS app architectures
Pull Request resolved: https://github.com/facebook/react-native/pull/53645
Test Plan:
### Manual Testing
**1. SwiftUI main App Test:**
```bash
# Created SwiftUI app with main lifecycle
# Integrated React Native component
# Result: No crash during orientation changes, fullscreen detection works
✅ PASS: Orientation changes handled safely
✅ PASS: Multitasking detection stable
```
**2. Traditional React Native App:**
```bash
# Tested with standard RN template app
# Verified existing behavior unchanged
✅ PASS: Existing functionality preserved
✅ PASS: No regressions in dimension reporting
```
**3. Brownfield Integration:**
```bash
# Integrated RN in existing iOS app without window property
# Triggered orientation changes and multitasking transitions
✅ PASS: No crashes during orientation events
✅ PASS: Split View and Slide Over work correctly
```
**4. Scene-based Lifecycle App:**
```bash
# Created app using SceneDelegate for window management
# Tested orientation and multitasking scenarios
✅ PASS: Proper handling when SceneDelegate manages windows
✅ PASS: No crashes during app lifecycle transitions
```
### Edge Case Testing
**RCTKeyWindow() Returns Nil:**
- Confirmed defaults to `YES` (fullscreen)
- No crashes when no key window available
- Multitasking detection remains stable
**Multiple Window Scenarios:**
- Tested with iPad multiple windows
- Uses correct key window for measurements
- Proper behavior in complex window hierarchies
**Orientation During Transitions:**
- App backgrounding/foregrounding during orientation
- Multitasking mode changes during rotation
- No crashes or inconsistent states
### Automated Testing
```bash
# All existing tests pass
yarn test
✅ RCTDeviceInfoTests pass
# Code style compliance
yarn lint
✅ Follows React Native Objective-C guidelines
```
### Impact Verification
**Before Fix:**
- Crash in SwiftUI apps using main
- Crash in Scene-based lifecycle apps
- Crash in brownfield integrations
**After Fix:**
- All app architectures work safely
- Multitasking detection preserved
- Backward compatibility maintained
- No performance impact
Rollback Plan:
Reviewed By: javache
Differential Revision: D81931754
Pulled By: cipolleschi
fbshipit-source-id: c3ea1a2922b1d48ca6bc1fc32861b490322fd254
React Native
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