flutter: fcm ios push notifications doesn't work in release mode

Question

I have bound my flutter-iOS app to firebase and i'm also using firebase-messaging and cloud functions for sending notifications via subscribing to topics, i'm using the APNs push notifications key of apple developer account. when i use the option runner>flutter run main.dart in release mode to build my app on my phone, fcm notifications doesn't work anymore, while it works in development mode, anyone can help me fix this?

this is my index.json code:

const functions = require('firebase-functions');
const admin = require('firebase-admin');

admin.initializeApp(functions.config().firebase);
 
var newData;
 
exports.messageTrigger = functions.firestore.document('notifications/{notificationsId}').onCreate(async (snapshot, context) => {
newData = snapshot.data();
const payload = {
    notification: {
        title: newData.title,
        body: newData.body,
        sound: 'default'
    },
    
        data: {
      click_action: 'FLUTTER_NOTIFICATION_CLICK',
      message: newData.title,
    }

};

if (newData.language === 'english'){
    await admin.messaging().sendToTopic('english', payload);
}
else if (newData.language === 'arabic'){
    await admin.messaging().sendToTopic('arabic', payload);
}
else if (newData.language === 'kurdish'){
    await admin.messaging().sendToTopic('kurdish', payload);
}
});

hence package.json:

{
  "name": "functions",
  "description": "Cloud Functions for Firebase",
  "scripts": {
    "lint": "eslint .",
    "serve": "firebase emulators:start --only functions",
    "shell": "firebase functions:shell",
    "start": "npm run shell",
    "deploy": "firebase deploy --only functions",
    "logs": "firebase functions:log"
  },
  "engines": {
    "node": "10"
  },
  "dependencies": {
    "firebase-admin": "^8.10.0",
    "firebase-functions": "^3.6.1"
  },
  "devDependencies": {
    "eslint": "^5.12.0",
    "eslint-plugin-promise": "^4.0.1",
    "firebase-functions-test": "^0.2.0"
  },
  "private": true
}

Answer 1

My project got the same issue. Combined two solutions I found, it finally works. (firebase_messaging 7.0.3)

As for debug mode, you don't need these.

Step 1: Edit AppDelegate.swift

import UIKit
import Flutter

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    if #available(iOS 10.0, *) {
      UNUserNotificationCenter.current().delegate = self as? UNUserNotificationCenterDelegate
    }
    
    GeneratedPluginRegistrant.register(with: self)

    application.registerForRemoteNotifications()

    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

Step 2: Edit ios/Runner/Info.plist. Add this:

<key>FirebaseAppDelegateProxyEnabled</key>
<string>NO</string>

Answer 2

After update firebase_messaging to 7.0.0 I had the same problem. I added application.registerForRemoteNotifications() in my AppDelegate.swift and it worked!