iOS, GCM에서 FCM으로 바꾸기.

Firebase Cloud Messaging (FCM) is the new version of GCM. It inherits the reliable and scalable GCM infrastructure, plus new features! See the FAQ to learn more. If you are integrating messaging in a new app, start with FCM. GCM users are strongly recommended to upgrade to FCM, in order to benefit from new FCM features today and in the future.

결국 해봤다...

Firebase Console 화면을 접속한다.

그리고 새 프로젝트를 생성한다.

참 편리하게도 기존에 만들어 놓은 프로젝트랑 바로 연결을 할 수 있었다.

그리고 새로운 plist 를 다운 받아 적용하였다.

plist 파일은 '프로젝트 설정' 에서 받을 수 있다.

다음은 Xcode 프로젝트에서 Firebase를 설치하였다.

Pod를 이용했고 기존에 쓰던 Google 은 지웠다.

처음엔 지우지 않으려 했는데 같이 존재하니 충돌이 나서 결국 지웠다.

버전 문제가 있을 수 있으니 udpate를 너무 안한 사람은 꼭 update를 하자.

#pod 'Google'

#pod 'Google/CloudMessaging'

pod 'Firebase'

pod 'Firebase/Messaging'

그러고 git에 있는 예제를 참고하며 AppDelegate를 수정하였다.

확 줄어든 코드 양에 무척 감사하였다.

아래는 예제에 있는 AppDelegate.swift 부분이다.

	//
	// Copyright (c) 2016 Google Inc.
	//
	// 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 UIKit
	import Firebase
	import FirebaseInstanceID
	import FirebaseMessaging
	@UIApplicationMain
	class AppDelegate: UIResponder, UIApplicationDelegate {
	var window: UIWindow?
	func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
	// Register for remote notifications
	if #available(iOS 8.0, *) {
	let settings: UIUserNotificationSettings =
	UIUserNotificationSettings(forTypes: [.Alert, .Badge, .Sound], categories: nil)
	application.registerUserNotificationSettings(settings)
	application.registerForRemoteNotifications()
	} else {
	// Fallback
	let types: UIRemoteNotificationType = [.Alert, .Badge, .Sound]
	application.registerForRemoteNotificationTypes(types)
	}
	FIRApp.configure()
	// Add observer for InstanceID token refresh callback.
	NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(self.tokenRefreshNotificaiton),
	name: kFIRInstanceIDTokenRefreshNotification, object: nil)
	return true
	}
	// [START receive_message]
	func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject],
	fetchCompletionHandler completionHandler: (UIBackgroundFetchResult) -> Void) {
	// If you are receiving a notification message while your app is in the background,
	// this callback will not be fired till the user taps on the notification launching the application.
	// TODO: Handle data of notification
	// Print message ID.
	print("Message ID: \(userInfo["gcm.message_id"]!)")
	// Print full message.
	print("%@", userInfo)
	}
	// [END receive_message]
	// [START refresh_token]
	func tokenRefreshNotificaiton(notification: NSNotification) {
	let refreshedToken = FIRInstanceID.instanceID().token()!
	print("InstanceID token: \(refreshedToken)")
	// Connect to FCM since connection may have failed when attempted before having a token.
	connectToFcm()
	}
	// [END refresh_token]
	// [START connect_to_fcm]
	func connectToFcm() {
	FIRMessaging.messaging().connectWithCompletion { (error) in
	if (error != nil) {
	print("Unable to connect with FCM. \(error)")
	} else {
	print("Connected to FCM.")
	}
	}
	}
	// [END connect_to_fcm]
	func applicationDidBecomeActive(application: UIApplication) {
	connectToFcm()
	}
	// [START disconnect_from_fcm]
	func applicationDidEnterBackground(application: UIApplication) {
	FIRMessaging.messaging().disconnect()
	print("Disconnected from FCM.")
	}
	// [END disconnect_from_fcm]
	}