fix(ios): workaround for Alert not showing (#1097)

Author: tido64

ios/ReactTestApp/React+Compatibility.m

@@ -90,3 +90,45 @@ - (void)rta_displayLayer:(CALayer *)layer
 @end
 
 #endif  // !TARGET_OS_OSX && REACT_NATIVE_VERSION < 6302
+
+// MARK: - [0.70.0] Alerts don't show when using UIScene
+// See https://github.com/facebook/react-native/pull/34562
+
+#if !TARGET_OS_OSX && REACT_NATIVE_VERSION < 7100
+
+#import <React/RCTAlertController.h>
+#import <React/RCTUtils.h>
+
+@implementation RCTAlertController (ReactTestApp)
+
++ (void)initialize
+{
+    if ([self class] != [RCTAlertController class]) {
+        return;
+    }
+
+    if (@available(iOS 13.0, *)) {
+        static dispatch_once_t onceToken;
+        dispatch_once(&onceToken, ^{
+          RTASwizzleSelector([self class], @selector(hide), @selector(rta_hide));
+          RTASwizzleSelector(
+              [self class], @selector(show:completion:), @selector(rta_show:completion:));
+        });
+    }
+}
+
+- (void)rta_hide
+{
+    // noop
+}
+
+- (void)rta_show:(BOOL)animated completion:(void (^)(void))completion
+{
+    [[RCTKeyWindow() rootViewController] presentViewController:self
+                                                      animated:animated
+                                                    completion:completion];
+}
+
+@end
+
+#endif  // !TARGET_OS_OSX && REACT_NATIVE_VERSION < 7100