应用程序启动后，如何为用户订阅主题以获取通知？
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【中文标题】应用程序启动后，如何为用户订阅主题以获取通知？【英文标题】：How can I subscribe user to a topic for notifications as soon as app starts up? 【发布时间】：2017-05-23 23:56:22 【问题描述】：我正在使用 HTTP POST 向应用程序上的所有用户发送通知。为此，我需要订阅一个名为“global”的主题。我希望每个用户都自动订阅此主题，以确保他们收到通知（假设他们已打开通知）。
我应该将订阅放在我的代码中的哪个位置，以确保它们始终被订阅？我担心我把它放错了地方，他们永远不会被订阅。我试图在 didFinishLaunchingWithOptions 结束时订阅，但现在在这里订阅似乎还为时过早（我猜是因为用户可能还没有接受通知提示？）。
目前订阅在 didRegisterForRemoteNotificationsWithDeviceToken 中，但是在第一个应用程序运行时不会调用它，所以为了让它工作，我必须第二次运行应用程序......这是我在 AppDelegate 中的相关代码：
import UIKit
import Firebase
import FirebaseMessaging
import UserNotifications
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate, FIRMessagingDelegate
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool
FIRApp.configure()
if #available(ios 10.0, *)
let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]
UNUserNotificationCenter.current().requestAuthorization(
options: authOptions,
completionHandler: _, _ in )
// For iOS 10 display notification (sent via APNS)
UNUserNotificationCenter.current().delegate = self
// For iOS 10 data message (sent via FCM)
FIRMessaging.messaging().remoteMessageDelegate = self
else
let settings: UIUserNotificationSettings =
UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
application.registerUserNotificationSettings(settings)
application.registerForRemoteNotifications()
return true
func applicationReceivedRemoteMessage(_ remoteMessage: FIRMessagingRemoteMessage)
print("applicationReceivedRemoteMessage")
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data)
if let refreshedToken = FIRInstanceID.instanceID().token()
print("InstanceID token: \(refreshedToken)")
FIRMessaging.messaging().subscribe(toTopic: "/topics/global")
@available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)
completionHandler(UNNotificationPresentationOptions.alert)
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any])
// 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.
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any], fetchCompletionHandler completionHandler: @escaping (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.
【问题讨论】：
【参考方案1】：您需要在两个地方订阅主题。
FIRApp.configure() 之后的一个。同时更新 Firebase iOS SDK 版本。好像您使用的是旧版本。
根据新版本 (FirebaseMessaging 2.0.1)。
if Messaging.messaging().fcmToken != nil
Messaging.messaging().subscribe(toTopic: “foo”)
然后是刷新令牌时的第二个。
func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String)
Messaging.messaging().subscribe(toTopic: “foo”)
这是原始答案的链接。检查贡献者提供的答案。
https://github.com/firebase/quickstart-ios/issues/307
【讨论】：
【参考方案2】：在 Firebase Messaging 4.0.4 中将其添加到 didRegisterForRemoteNotificationsWithDeviceToken 方法中，剩下的工作就完成了
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data)
Messaging.messaging().apnsToken = deviceToken
Messaging.messaging().subscribe(toTopic: hubId)
【讨论】：
【参考方案3】：在这个didReceiveRegistrationToken方法中应该增加订阅方法，这样每当token刷新时，就会自动订阅主题。
func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String)
Messaging.messaging().subscribe(toTopic: "TestTopic") error in
if error == nil
print("Subscribed to topic")
else
print("Not Subscribed to topic")
【讨论】：
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