<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.ramzey.fcmandroidios"

    <uses-permission android:name="android.permission.INTERNET"/>

   <application
       android:usesCleartextTraffic="true"

flutter pub add firebase_core

flutter pub add firebase_messaging

flutter pub add push_fire_notifications

import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:push_fire_notifications/pushnotification.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  try{
    await Firebase.initializeApp();
  }catch(ex){
  }
  runApp( MyApp());
}

class MyApp extends StatelessWidget {
   MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return PushFireNotifications(
      fcmTokenGet: (String token) {
        // Here we can get FCM token when app starts.
        print("TOKEN : "+token);
      },
      onNotification: (String payload) {
        // This function trigger whenever notification occurs
        // get data in payload
        print("1 "+payload);
      },
      onTapNotification: (String payload) {
        // This function use for on tap notification when app
        // is running mode
        print("2 "+payload);
      },
      onTapAppTerminatedNotification: (String payload) {
        // This function use for on tap notification when
        // app is terminated mode
        print("3 "+payload);
      },
      child: MaterialApp(
        title: 'Flutter Demo',
        debugShowCheckedModeBanner: false,
        theme: ThemeData(

          primarySwatch: Colors.blue,
        ),
        home: Scaffold(appBar: AppBar(title: Text("FCM :) "),),body: Container(child: Text("Hello"),),),
      ),
    );
  }
}

post edilecek url : https://fcm.googleapis.com/fcm/send

HEADERE EKLENECEK PARAM :

key = Authorization

Value = key=AAAAW4rLnrk:APA91bGEYeev_aYl_RO4SZUrmkd-uxbJaa-biT18xOmyl9MsZp8rdHdvy13F1qzH1gG3xiObAzcvWQ1MuVIIC7r3bV-M1dN9PywmkVUcnjx5

BODY -> ROW -> JSON  :

{

   "to": "dgjbLgSsR8uDhLDnQuDblV:APA91bFCfsmT7zhi7qxwf9RDJG9tVCu_doKdRNvqOs0-4_ax7CmJy_9MQ1Jqj4nL3cmDCBt3tzGv8zFVng_G_lYRFnSP_mJekwo8K-jz100tmrXfvC0hUeQJOYB_2Ux7hKM9Oh5jC3Hf",

   "notification": {

    "body": "akakçede indirim hemen girin %40 indirim",

    "title": "Selamün aleyküm 23",

    "content_available" : true,

    "priority" : "high"

   }

}

EKRAN GÖRÜNTÜSÜ

import UIKit
import Flutter
import Firebase
import FirebaseMessaging

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {

  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
  FirebaseApp.configure()
    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }

   override func application(_ application: UIApplication,
    didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {

     Messaging.messaging().apnsToken = deviceToken
     print("Token2: \(deviceToken)")
     super.application(application,
     didRegisterForRemoteNotificationsWithDeviceToken: deviceToken)
   }
}

import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';


class LocalNotificationService {
  static final FlutterLocalNotificationsPlugin _notificationsPlugin =
  FlutterLocalNotificationsPlugin();

  static get onDidReceiveLocalNotification => null;

  static void initialize() {
    try{
      // initializationSettings  for Android


      const AndroidInitializationSettings androidInitializationSettings =
      AndroidInitializationSettings("@mipmap/ic_launcher");

      IOSInitializationSettings iosInitializationSettings =
      IOSInitializationSettings(
        requestAlertPermission: true,
        requestBadgePermission: true,
        requestSoundPermission: true,
        onDidReceiveLocalNotification: onDidReceiveLocalNotification,
      );

      final InitializationSettings settings = InitializationSettings(
        android: androidInitializationSettings,
        iOS: iosInitializationSettings,
      );

       _notificationsPlugin.initialize(
        settings,
         onSelectNotification: (String? id) async {
      },
      );


    }catch(ex){
      print("hst "+ex.toString());
    }
  }

  static void createanddisplaynotification(RemoteMessage message) async {
    try {
      final id = DateTime.now().millisecondsSinceEpoch ~/ 1000;

      await FirebaseMessaging.instance.setForegroundNotificationPresentationOptions(
        alert: true,
        badge: true,
        sound: true,
      );

      var _messaging = FirebaseMessaging.instance;
      NotificationSettings settings = await _messaging.requestPermission(
          alert: true, badge: true, sound: true, provisional: false);

      const NotificationDetails notificationDetails = NotificationDetails(
        android: AndroidNotificationDetails(
          "egitimbildirim",
          "egitimbildirimchannel",
          importance: Importance.max,
          priority: Priority.high,
        ),
      );

      await _notificationsPlugin.show(
        id,
        message.notification!.title!+" aa",
        message.notification!.body,
        notificationDetails,
        //payload: message.data['_id'],
      );
    } on Exception catch (e) {
      print(e);
    }
  }
}

import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/material.dart';
import 'package:flutterandroidfcmpush/homepage.dart';

import 'LocalNotificationService.dart';

@pragma('vm:entry-point')
Future<void> backgroundHandler(RemoteMessage message) async {
  // print(message.data.toString());
  // print(message.notification!.title);
}

Future<void> main() async {

  WidgetsFlutterBinding.ensureInitialized();

  try{
    await Firebase.initializeApp();
    FirebaseMessaging.onBackgroundMessage(backgroundHandler);
    LocalNotificationService.initialize();
    //(sonradan eklendi) Update the iOS foreground notification presentation options to allow heads up notifications.
    await FirebaseMessaging.instance.setForegroundNotificationPresentationOptions(
      alert: true,
      badge: true,
      sound: true,

    );

    var _messaging = FirebaseMessaging.instance;
    NotificationSettings settings = await _messaging.requestPermission(
        alert: true, badge: true, sound: true, provisional: false);

    if (settings.authorizationStatus == AuthorizationStatus.authorized) {
      String? token = await _messaging.getToken();
      print("IOS TOKEN : " + (token ?? ""));
    }

  }catch(ex){
  }

  runApp( MyApp());
}

class MyApp extends StatelessWidget {
   MyApp({super.key});
  // rambo
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return  MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(

        primarySwatch: Colors.blue,
      ),
      home:  HomePage(),
    );
  }}

class Sabitler {
  static String token="";
}

import 'dart:io';

import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutterandroidfcmpush/sabitler.dart';

import 'LocalNotificationService.dart';

class HomePage extends StatefulWidget {
  const HomePage({Key? key}) : super(key: key);

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
   @override
  void initState() {
    // TODO: implement initState
    super.initState();
    fcmRun();
  }

  void fcmRun() {

    /*

    // uygulama kapalı iken çalışacak metot

    FirebaseMessaging.instance.getInitialMessage().then(

      (message) {

        print("1-> FirebaseMessaging.instance.getInitialMessage()");

      },

    );*/

    // 2. This method only call when App in forground it mean app must be opened

// uygulama açıkken tıklanınca çalışan metot

    FirebaseMessaging.onMessage.listen(

          (message) {

        print("2-> FirebaseMessaging.instance.getInitialMessage()");

        if (Platform.isAndroid) {

          LocalNotificationService.createanddisplaynotification(message);

        }

      },

    );

    // 3. This method only call when App in background and not terminated(not closed)

    // uygulama açık ama arka plandayken çalışan metot

    FirebaseMessaging.onMessageOpenedApp.listen(

          (message) {

        print("3-> FirebaseMessaging.onMessageOpenedApp.listen");

      },

    );

    FirebaseMessaging.instance

        .subscribeToTopic("all")

        .then((value) => print("topic all olarak eklendi"));

    FirebaseMessaging.instance.getToken().then((value) {

      print('firebaseToken $value');

      Sabitler.token = value!;

      Clipboard.setData(ClipboardData(text: Sabitler.token));

      setState(() {});

    });

  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text("FCM İOS İÇİN"),
        ),
        body: Container(
          child: Text(Sabitler.token),
        ));
  }
}

flutter pub add push_fire_notifications

1- main.dart

child: PushFireNotifications(
  fcmTokenGet: (String token) {
    // Here we can get FCM token when app starts.
    print("TOKEN : "+token);
  },
  onNotification: (String payload) {

    // This function trigger whenever notification occurs
    // get data in payload
    print("1 "+payload);
  },
  onTapNotification: (String payload) {

    // This function use for on tap notification when app
    // is running mode
    print("1 "+payload);
  },
  onTapAppTerminatedNotification: (String payload) {
    // This function use for on tap notification when
    // app is terminated mode
    print("1 "+payload);
  },
  child: MaterialApp(

import UIKit

import Flutter

import Firebase

import FirebaseMessaging

@UIApplicationMain

@objc class AppDelegate: FlutterAppDelegate {

  override func application(

    _ application: UIApplication,

    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?

  ) - Bool {

  FirebaseApp.configure()

    GeneratedPluginRegistrant.register(with: self)

    return super.application(application, didFinishLaunchingWithOptions: launchOptions)

  }

   override func application(_ application: UIApplication,

    didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {

     Messaging.messaging().apnsToken = deviceToken

     print("Token2: \(deviceToken)")

     super.application(application,

     didRegisterForRemoteNotificationsWithDeviceToken: deviceToken)

   }

}