ios - Firebase FCM 最初不工作，但如果打开应用程序，则在 3-4 次后工作

Question

我是 Firebase FCM 集成的新手，我遇到了一些问题。第一次安装该应用程序时，我没有收到推送通知，但如果我打开和关闭应用程序几次，然后从 Firebase 发送推送通知，我将收到通知，而客户端或服务器代码没有任何更改。谁能帮我解决这个问题？

我在下面附上了我的 appdelegate 代码

import UIKit
import Firebase
import UserNotifications
import FirebaseMessaging
import FirebaseInstanceID

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

    var window: UIWindow?


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


        FirebaseApp.configure()

        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: { (granted, error) in
                    if error == nil{
                        UIApplication.shared.registerForRemoteNotifications()
                    }
            })
        } else {
            let settings: UIUserNotificationSettings =
                UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
            application.registerUserNotificationSettings(settings)
                application.registerForRemoteNotifications()
        }

        application.registerForRemoteNotifications()
        return true
    }

    func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String) {
        print("Firebase registration token: \(fcmToken)")
    }

    func application(_ application: UIApplication, didRegister notificationSettings: UIUserNotificationSettings) {
        UIApplication.shared.registerForRemoteNotifications()
    }

    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        // I have tried both method but none worked and i also tried MessagingAPNSTokenType.sandbox and prod
        // Method 1: Messaging.messaging().apnsToken = deviceToken
        // Method 2:
        Messaging.messaging().setAPNSToken(deviceToken, type: MessagingAPNSTokenType.unknown)
    }
}

提前致谢

Answer 1

我遇到了与您相同的问题，并且有一个已知问题 FCM token并不总是与 APNs device token 相关联如果UIApplication.shared.registerForRemoteNotifications()调用不够早。

根据 this GitHub 线程此问题已在 FirebaseInstanceID SDK 中修复，应该很快就会出来。

与此同时，您可以:

锁定您的 FirebaseInstanceID pod to 2.0.0在你的 Podfile 中，或者

确保您正在调用 UIApplication.shared.registerForRemoteNotifications()在应用程序启动时，最好在 FirebaseApp.configure() 之前.

更新:
我刚刚做了一些额外的测试，我注意到这在什么时候起作用有点随机。对于某些设备，它可以立即用于某些设备，而对于某些则不能。对于某些设备 Single Token push工作而不是User Segment .我设法让它工作，这样你至少要么得到 Single Token push或 User Segment通过添加以下内容:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    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)
        Messaging.messaging().delegate = self
        application.registerForRemoteNotifications()
        print("::: registerForRemoteNotifications iOS 10")

    } else {
        let settings: UIUserNotificationSettings =
            UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
        application.registerUserNotificationSettings(settings)
        application.registerForRemoteNotifications()
        print("::: registerUserNotificationSettings iOS 9")
    }

    FirebaseApp.configure()
    Messaging.messaging().delegate = self
    Messaging.messaging().shouldEstablishDirectChannel = true

    if let refreshedToken = InstanceID.instanceID().token() {
        print("::: InstanceID token: \(refreshedToken)")
    }

    NotificationCenter.default.addObserver(self, selector: #selector(tokenRefreshNotification), name: NSNotification.Name.InstanceIDTokenRefresh, object: nil)
}

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    Messaging.messaging().setAPNSToken(deviceToken, type: .prod)

    if let refreshedToken = InstanceID.instanceID().token() {
        print("InstanceID token: \(refreshedToken)")
    }
}

问题是，如果您不访问 didRegisterForRemoteNotificationsWithDeviceToken，它将无法工作。功能。