From 05c4321b194c3d0e146b6085bcaccc75acd3fd67 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Oskar=20Kwas=CC=81niewski?= <oskarkwasniewski@icloud.com>
Date: Tue, 2 Sep 2025 11:19:42 -0700
Subject: [PATCH] fix: fallback alert controller to UIScreen size (#53500)

Summary:
This PR falls back to UIScreen when windowScene is not available.

<img width="500" alt="CleanShot 2025-08-28 at 14 30 59@2x" src="https://github.com/user-attachments/assets/9dda3153-dfe7-48a5-9d0e-5416c2e34c64" />

## Changelog:

[IOS] [FIXED] - Simplify RCTAlertController, don't create additional UIWindow

Pull Request resolved: https://github.com/facebook/react-native/pull/53500

Test Plan:
Open the alert multiple times to check if everything works as expected.

Rollback Plan:

Reviewed By: javache

Differential Revision: D81410450

Pulled By: cipolleschi

fbshipit-source-id: c27ea98d9e811c2f259f0ff3c6689482d116c418
---
 .../react-native/React/CoreModules/RCTAlertController.mm   | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/packages/react-native/React/CoreModules/RCTAlertController.mm b/packages/react-native/React/CoreModules/RCTAlertController.mm
index b47ce0adefa..3131ff4db59 100644
--- a/packages/react-native/React/CoreModules/RCTAlertController.mm
+++ b/packages/react-native/React/CoreModules/RCTAlertController.mm
@@ -20,7 +20,12 @@
 - (UIWindow *)alertWindow
 {
   if (_alertWindow == nil) {
-    _alertWindow = [[UIWindow alloc] initWithWindowScene:RCTKeyWindow().windowScene];
+    UIWindowScene *scene = RCTKeyWindow().windowScene;
+    if (scene != nil) {
+      _alertWindow = [[UIWindow alloc] initWithWindowScene:scene];
+    } else {
+      _alertWindow = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
+    }
 
     if (_alertWindow) {
       _alertWindow.rootViewController = [UIViewController new];