iOS Swift Firebase InstanceID 令牌首次返回 Nil

Question

我在我的应用中使用 Firebase 通知。当我第一次安装我的应用程序时，FIRInstanceID.instanceID().token() 返回 nil，但下次它不会返回 nil。除了这个，一切都做得很完美。

代码如下：

import UIKit
import Firebase
import FirebaseMessaging
import FirebaseInstanceID
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate, FIRMessagingDelegate
{

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool
{
        //Configuring Firebase
        FIRApp.configure()
if #available(iOS 10.0, *)
        {
            print("Test")
            // For iOS 10 display notification (sent via APNS)
            UNUserNotificationCenter.current().delegate = self
            UNUserNotificationCenter.current().requestAuthorization(options: [.badge, .sound, .alert]) { (granted, error) in
                if granted
                {
                    //self.registerCategory()
                }
            }
            // 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()
NotificationCenter.default.addObserver(self, selector: #selector(self.tokenRefreshNotification), name: NSNotification.Name.firInstanceIDTokenRefresh, object: nil)
        return true
}
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data)
    {
        FIRInstanceID.instanceID().setAPNSToken(deviceToken, type: FIRInstanceIDAPNSTokenType.sandbox)
        FIRInstanceID.instanceID().setAPNSToken(deviceToken, type: FIRInstanceIDAPNSTokenType.prod)
    }
func tokenRefreshNotification(notification: NSNotification)
    {
        if let refreshedToken = FIRInstanceID.instanceID().token()
        {
            print("InstanceID token: \(refreshedToken)")
        }
        // Connect to FCM since connection may have failed when attempted before having a token.
        connectToFcm()
    }

    func connectToFcm()
    {
        FIRMessaging.messaging().connect { (error) in
            if (error != nil)
            {
                print("Unable to connect with FCM. \(error)")
            }
            else
            {
                print("Connected to FCM.")
            }
        }
    }
}

在远程页面中我正在调用 Firebase InstanceID 令牌

let token = FIRInstanceID.instanceID().token()

但第一次它返回 nil 值。

Answer 1

需要在AppDelegate File中添加这行代码 didFinishLaunchingWithOptions function

在 FirebaseApp.configure() 之前调用 application.registerForRemoteNotifications()

1. 像这样。 application.registerForRemoteNotifications() FirebaseApp.configure()

Answer 2

最后我得到了一些解决方案。 Firebase 需要一些时间才能连接到 FCM。所以我所做的是，如果FIRInstanceID.instanceID().token() 返回 nil，我会在 5 秒后更新我的代码。 Firebase 将在 5 秒内连接到 FCM。这不是完美的解决方案，但现在这是解决它的唯一方法。

Answer 3

更改FIRApp.configure()的顺序并尝试一次，更多信息您可以获取示例here

func application(_ application: UIApplication,
               didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

// Register for remote notifications. This shows a permission dialog on first run, to
// show the dialog at a more appropriate time move this registration accordingly.
// [START register_for_notifications]
if #available(iOS 10.0, *) {
  // For iOS 10 display notification (sent via APNS)
  UNUserNotificationCenter.current().delegate = self

  let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]
  UNUserNotificationCenter.current().requestAuthorization(
    options: authOptions,
    completionHandler: {_, _ in })

  // 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()

// [END register_for_notifications]
FIRApp.configure()

// [START add_token_refresh_observer]
// Add observer for InstanceID token refresh callback.
NotificationCenter.default.addObserver(self,
    selector: #selector(self.tokenRefreshNotification),
    name: .firInstanceIDTokenRefresh,
    object: nil)
// [END add_token_refresh_observer]
return true
}

在令牌是否到来时对该委托进行检查

func tokenRefreshNotification(notification: NSNotification) {
      //  print("refresh token call")
        guard let contents = FIRInstanceID.instanceID().token()
        else {
            return
        }
           // let refreshedToken = FIRInstanceID.instanceID().token()!
            print("InstanceID token: \(contents)")

           // UserDefaults.standardUserDefaults().set(contents, forKey: "deviceToken");
            // Connect to FCM since connection may have failed when attempted before having a token.

            connectToFcm()

    }

最后像这样连接FCM

func connectToFcm() {
// Won't connect since there is no token
guard FIRInstanceID.instanceID().token() != nil else {
  return
}

// Disconnect previous FCM connection if it exists.
FIRMessaging.messaging().disconnect()

FIRMessaging.messaging().connect { (error) in
  if error != nil {
    print("Unable to connect with FCM. \(error?.localizedDescription ?? "")")
  } else {
    print("Connected to FCM.")
  }
}
  }