FCM iOS推送通知显示，但didRecieve委托方法从未调用

Question

我想使用willPresent方法在前台发送通知，但在后台不发送。但是，通知始终显示。

这是我的appdelegate：

import UIKit
import UserNotifications
import Firebase
import FirebaseMessaging
import RxSwift

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate, MessagingDelegate {

    var window: UIWindow?
    let disposeBag = DisposeBag()

    override init() {
        super.init()

    }

    func application(
        _ application: UIApplication,
        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
        ) -> Bool
    {
        FirebaseApp.configure()
        if #available(iOS 10.0, *) {
            Messaging.messaging().delegate = self
            Messaging.messaging().shouldEstablishDirectChannel = true
            Messaging.messaging().useMessagingDelegateForDirectChannel = true
            // 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
                    self.getNotificationSettings()
            })
        } else {
            let settings: UIUserNotificationSettings =
                UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
            application.registerUserNotificationSettings(settings)
        }

        // Check user logged
        if let accessToken = UserDefaults.standard.value(forKey : "AccessToken") as? String, accessToken.count > 2 {
            window?.rootViewController = Assembler.createMainViewController()
        } else {
            window?.rootViewController = Assembler.createAuthViewController()
        }

        return true
    }

    func userNotificationCenter(_ center: UNUserNotificationCenter,
                                didReceive response: UNNotificationResponse,
                                withCompletionHandler completionHandler: @escaping () -> Void)
    {
        Messaging.messaging().appDidReceiveMessage(response.notification.request.content.userInfo)

        (window?.rootViewController as? UITabBarController)?.selectedIndex = 2
        UIApplication.shared.applicationIconBadgeNumber = 0
    }

    func application(_ application: UIApplication,
                     didReceiveRemoteNotification userInfo: [AnyHashable : Any],
                     fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void)
    {
        print(userInfo)
        if let accessToken = UserDefaults.standard.value(forKey : "AccessToken") as? String, accessToken.count > 2, application.applicationState == .active {
            Messaging.messaging().appDidReceiveMessage(userInfo)
            guard let aps = userInfo["aps"] as? [String: AnyObject], let body = aps["alert"] as? String else {
                completionHandler(.failed)
                return
            }
            print(body)
            UIApplication.shared.applicationIconBadgeNumber += 1
            let notificationCenter = UNUserNotificationCenter.current()
            let content = UNMutableNotificationContent()
            content.body = body
            let request = UNNotificationRequest(identifier: "FIRST_LOCAL_NOTIFICATION", content: content, trigger: nil)
            notificationCenter.add(request) { (error) in
                if let error = error {
                    print("Unable to Add Notification Request (\(error), \(error.localizedDescription))")
                }
            }
        }
    }

    func userNotificationCenter(_ center: UNUserNotificationCenter,
                                willPresent notification: UNNotification,
                                withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)
    {
        print(notification.request.content)
        let options = UNNotificationPresentationOptions(arrayLiteral: .alert, .sound)
        completionHandler(options)
    }

    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        InstanceID.instanceID().instanceID { (result, error) in
            if let error = error {
                print("Error fetching remote instance ID: \(error)")
            } else if let result = result {
                print("Remote instance ID token: \(result.token)")
                Messaging.messaging().setAPNSToken(deviceToken, type: .prod)
                Messaging.messaging().setAPNSToken(deviceToken, type: .sandbox)
                APIManager.shared.rx_registerFCMWith(token: result.token)
                    .subscribe(onNext: { (val) in
                        print("FCM REGISTRATION HAS FINISHED SUCCESSUFULLY")
                    }, onError: { (error) in
                        print("FCM REGISTRATION HAS FAILED \(error.localizedDescription)")
                    }).disposed(by: self.disposeBag)
            }
        }
    }

    func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) {
        let dataDict:[String: String] = ["token": fcmToken]
        NotificationCenter.default.post(name: Notification.Name("FCMToken"), object: nil, userInfo: dataDict)
    }

    func messaging(_ messaging: Messaging, didReceive remoteMessage: MessagingRemoteMessage) {
        guard let data = try? JSONSerialization.data(withJSONObject: remoteMessage.appData, options: .prettyPrinted),
            let prettyPrinted = String(data: data, encoding: .utf8) else {
                return
        }

        UIApplication.shared.applicationIconBadgeNumber += 1
        print("Received direct channel message:\n\(prettyPrinted)")
    }


    private func getNotificationSettings() {
        UNUserNotificationCenter.current().getNotificationSettings { (settings) in
            print("Notification settings: \(settings)")
            guard settings.authorizationStatus == .authorized else { return }
            DispatchQueue.main.async(execute: {
                UIApplication.shared.registerForRemoteNotifications()
            })
        }
    }

}