应用程序打开时没有收到Firebase推送通知？

我正在使用google firebase和iOS swift进行推送通知。 当应用程序在后台打开或手机被锁定时，我收到通知。 但是当应用程序打开时没有收到任何通知。 以下是我的AppDelegate。 任何帮助将不胜感激？

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？