Flutter local notification not working on iOS

Notifications are working properly on Android but not working at all on iOS (tried on emulator).
I have the code in the main page and the notification doesn’t show.
Please note that I already made changes on AppDelegate.swift file.

FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();

flutterLocalNotificationsPlugin
        .resolvePlatformSpecificImplementation<
            AndroidFlutterLocalNotificationsPlugin>()!
        .requestPermission();

    const AndroidInitializationSettings initializationSettingsAndroid = AndroidInitializationSettings('icon');

    final DarwinInitializationSettings initializationSettingsDarwin =
        DarwinInitializationSettings(
            requestSoundPermission: true,
            requestBadgePermission: true,
            requestAlertPermission: true,
            onDidReceiveLocalNotification: onDidReceiveLocalNotification);

    final InitializationSettings initializationSettings =
        InitializationSettings(
            android: initializationSettingsAndroid,
            iOS: initializationSettingsDarwin,
            macOS: initializationSettingsDarwin);

    await flutterLocalNotificationsPlugin.initialize(initializationSettings, onDidReceiveNotificationResponse:  onDidReceiveNotificationResponse);

    const AndroidNotificationDetails androidNotificationDetails =
        AndroidNotificationDetails('can1', 'Channel 1',
            channelDescription: "Desc here",
            importance: Importance.max,
            priority: Priority.high,
            ticker: 'ticker');

    const NotificationDetails notificationDetails =
        NotificationDetails(android: androidNotificationDetails);

    await flutterLocalNotificationsPlugin.show(
        0, 'Notification is working!', 'Hello world', notificationDetails, payload: 'item x');