Question

我正在使用Xamarin.Forms中的FirebasePushNotificationPlugin实现FCM推送通知。在iOS项目中，在AppDelegate中，当RegisteredForRemoteNotifications方法调用deviceToken生成时，但是当我通过Postman发送生成的token的通知时，却出错了。

{“ multicast_id”：8631208504861228784，“成功”：0，“失败”：1， “ canonical_ids”：0，“ results”：[{“ error”：“ InvalidRegistration”}] }

这是我在AppDelegate上从here获得的代码：

public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
    global::Xamarin.Forms.Forms.Init();
    LoadApplication(new App());

    FirebasePushNotificationManager.Initialize(options, new NotificationUserCategory[]
    {
        new NotificationUserCategory("message",new List<NotificationUserAction> {
            new NotificationUserAction("Reply","Reply",NotificationActionType.Foreground)
        }),
        new NotificationUserCategory("request",new List<NotificationUserAction> {
            new NotificationUserAction("Accept","Accept"),
            new NotificationUserAction("Reject","Reject",NotificationActionType.Destructive)
        })
    });

    return base.FinishedLaunching(app, options);
}

public override void RegisteredForRemoteNotifications(UIApplication application, NSData deviceToken)
{
    FirebasePushNotificationManager.DidRegisterRemoteNotifications(deviceToken);
    Console.WriteLine("Token- - - :  "+deviceToken);
}

public override void FailedToRegisterForRemoteNotifications(UIApplication application, NSError error)
{
    FirebasePushNotificationManager.RemoteNotificationRegistrationFailed(error);
}

public override void DidReceiveRemoteNotification(UIApplication application, NSDictionary userInfo, Action<UIBackgroundFetchResult> completionHandler)
{
    FirebasePushNotificationManager.DidReceiveMessage(userInfo);
    System.Console.WriteLine(userInfo);
    completionHandler(UIBackgroundFetchResult.NewData);
}

发送示例通知时，

邮递员中的数据object

{ 
 "to":"79f64b43339859a329a935f7a3e417ecc1599fbb5d6935afbooa3b4291c07fa7", 
 "notification" : {
 "body" : "New task",
 "content_available" : true,
 "priority" : "high",
 "color":"Page1",
 "title":"Announcement"
 },
 "data" : {
 "color":"Page1",
 "title":"title",
 "content_available" : true,
 "body" : "New Announcement ad"

}
}

邮递员的尸体

这些是Visual Studio中的“配置”配置文件设置

我该如何解决这个问题？

Answer 1

我对Xamarin不熟悉。但是我与FCM合作很多。

我认为您获得了错误的令牌。使用deviceToken不适用于FCM的推送通知。我进行了搜索，也许您必须从

获取它

var fcmToken = FirebaseInstanceId.Instance.Token;

更多详细信息： https://docs.microsoft.com/en-us/xamarin/android/data-cloud/google-messaging/remote-notifications-with-fcm?tabs=macos

Answer 2

编辑是因为我对RegisteredForRemoteNotifications的最初回答是错误的

根据here所述，实际令牌位于收到的令牌的说明中：

public override void RegisteredForRemoteNotifications (
UIApplication application, NSData deviceToken)
{
    // Get current device token
    var DeviceToken = deviceToken.Description;
    if (!string.IsNullOrWhiteSpace(DeviceToken)) {
        DeviceToken = DeviceToken.Trim('<').Trim('>');
    }

    // Get previous device token
    var oldDeviceToken = NSUserDefaults.StandardUserDefaults.StringForKey("PushDeviceToken");

    // Has the token changed?
    if (string.IsNullOrEmpty(oldDeviceToken) || !oldDeviceToken.Equals(DeviceToken))
    {
        //TODO: Put your own logic here to notify your server that the device token has changed/been created!
    }

    // Save new device token
    NSUserDefaults.StandardUserDefaults.SetString(DeviceToken, "PushDeviceToken");
}

所以令牌是上面的DeviceToken。

作为实现_ RegisteredForRemoteNotifications_的替代方法，您可以执行以下操作：

使您的AppDelegate实现IMessagingDelegate接口。

实施以下方法：

//每当生成新令牌时都会触发此回调-为了被调用，AppDelegate必须是IMessagingDelegate

[Export（“ messaging：didReceiveRegistrationToken：”）]

公共异步无效DidReceiveRegistrationToken（消息传递，字符串令牌） {

        // Subscribe to a 'news' topic so we can send to just those subscribed to this topic
        messaging.Subscribe("news");


        // Log this to debug output so that we can capture it for testing
        Debug.WriteLine($"DidReceiveRegistration Token:'{token}'");


    }

发送推送通知时出现“错误”：“ InvalidRegistration”

2 个答案: