firebase-ios-sdk/Example/watchOSSample/SampleWatchAppWatchKitExtension/ExtensionDelegate.swift

// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import WatchKit

import FirebaseCore
//import FirebaseMessaging
//import FirebaseRemoteConfig

/// Entry point of the watch app.
class ExtensionDelegate: NSObject, WKExtensionDelegate {
  /// Initialize Firebase service here.
  func applicationDidFinishLaunching() {
    FirebaseApp.configure()
//    let center = UNUserNotificationCenter.current()
//    center.requestAuthorization(options: [.alert, .sound]) { granted, _ in
//      if granted {
//        WKExtension.shared().registerForRemoteNotifications()
//      }
//    }
//    Messaging.messaging().delegate = self
//    let remoteConfig = RemoteConfig.remoteConfig()
//    remoteConfig.fetchAndActivate { _, error in
//      guard error == nil else {
//        print("error:" + error.debugDescription)
//        return
//      }
//      let defaultOutput = "You have not set up a 'test' key in Remote Config console."
//      let configValue: String =
//        remoteConfig["test"].stringValue ?? defaultOutput
//      print("value:\n" + configValue)
//    }
  }

  /// MessagingDelegate
//  func messaging(_: Messaging, didReceiveRegistrationToken fcmToken: String?) {
////    print("token:\n" + fcmToken!)
////    Messaging.messaging().subscribe(toTopic: "watch") { error in
////      guard error == nil else {
////        print("error:" + error.debugDescription)
////        return
////      }
////      print("Successfully subscribed to topic")
////    }
//  }

  /// WKExtensionDelegate
  func didRegisterForRemoteNotifications(withDeviceToken deviceToken: Data) {
    /// Swizzling should be disabled in Messaging for watchOS, set APNS token manually.
//    print("Set APNS Token\n")
//    Messaging.messaging().apnsToken = deviceToken
  }
}