react-native-macos/React/CoreModules/RCTAlertController.m

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

#import <React/RCTUtils.h>

#import <React/RCTAlertController.h>

@interface RCTAlertController ()

@property (nonatomic, strong) UIWindow *alertWindow;

@end

@implementation RCTAlertController

- (UIWindow *)alertWindow
{
  if (_alertWindow == nil) {
    _alertWindow = [[UIWindow alloc] initWithFrame:RCTSharedApplication().keyWindow.bounds];
    _alertWindow.rootViewController = [UIViewController new];
    _alertWindow.windowLevel = UIWindowLevelAlert + 1;
  }
  return _alertWindow;
}

- (void)show:(BOOL)animated completion:(void (^)(void))completion
{
  if (@available(iOS 13.0, *)) {
    UIUserInterfaceStyle style =
        RCTSharedApplication().delegate.window.overrideUserInterfaceStyle ?: UIUserInterfaceStyleUnspecified;
    self.overrideUserInterfaceStyle = style;
  }
  [self.alertWindow makeKeyAndVisible];
  [self.alertWindow.rootViewController presentViewController:self animated:animated completion:completion];
}

- (void)hide
{
  [_alertWindow setHidden:YES];

  if (@available(iOS 13, *)) {
    _alertWindow.windowScene = nil;
  }

  _alertWindow = nil;
}

@end