应用程序打开时没有收到Firebase推送通知？

Question

我使用google firebase和iOS swift进行推送通知。我在应用程序在后台打开或手机被锁定时收到通知。但是当应用程序打开时没有收到任何通知。以下是我的AppDelegate。任何帮助都会受到赞赏吗？

import UIKit
import UserNotifications
import Firebase
import FirebaseInstanceID
import FirebaseMessaging

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {

    var window: UIWindow?


    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.

        //FIREBASE CONFIGS
        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

            //Messaging.messaging().remoteMessageDelegate = self as! MessagingDelegate

        } else {
            let settings: UIUserNotificationSettings =
                UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
            application.registerUserNotificationSettings(settings)
        }

        application.registerForRemoteNotifications()

        FirebaseApp.configure()
        //FIREBASE CONFIGS

        let alert = UIAlertController(title: "Test", message:"Message", preferredStyle: UIAlertControllerStyle.alert)

        // add an action (button)
        alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))

        // show the alert
        self.window?.rootViewController?.present(alert, animated: true, completion: nil)

        return true
    }
    //For FIREBASE
    func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any]) {

        if let messageID = userInfo["gcm_message_id"] {
            print("Message ID: \(messageID)")
        }

        // Print full message.
        print(userInfo)

        let alert = UIAlertController(title: "FireBase", message:"didReceiveRemoteNotification", preferredStyle: UIAlertControllerStyle.alert)

        // add an action (button)
        alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))

        // show the alert
        self.window?.rootViewController?.present(alert, animated: true, completion: nil)
    }

    func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
                     fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {

        if let messageID = userInfo["gcm_message_id"] {
            print("Message ID: \(messageID)")
        }

        // Print full message.
        print(userInfo)


        let alert = UIAlertController(title: "FireBase", message:"didReceiveRemoteNotification fetchCompletionHandler", preferredStyle: UIAlertControllerStyle.alert)

        // add an action (button)
        alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))

        // show the alert
        self.window?.rootViewController?.present(alert, animated: true, completion: nil)


        completionHandler(UIBackgroundFetchResult.newData)
    }
    func application(received remoteMessage: MessagingRemoteMessage) {
        print(" APNSData \(remoteMessage.appData)")
    }

    func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String) {
        print("Firebase registration token: \(fcmToken)")
    }
    private func application(application: UIApplication,
                     didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {
        Messaging.messaging().apnsToken = deviceToken as Data
    }




}

请帮我弄清楚出了什么问题？