DidReceiveRemoteNotification 从未在 Xamarin.iOS 中调用

Question

我正在尝试使用 Xamarin 和 Xamarin.Firebase.iOS.CloudMessaging 包为我的 iOS 应用程序实现推送通知。

我已经完成了所有设置和工作，即。当应用程序处于前台时我可以接收通知（包含和不包含“content-available" 标签”）并与它们交互（点击通知等）

但是，当应用程序在后台时，我会收到通知，但不会调用任何回调。据我了解，"didReceiveRemoteNotification" 应在以下情况下调用：

1. 无论"content-available" 标签是否启用，应用程序都在前台
2. 如果应用程序在后台或挂起，启用"content-available"标签
3. 当用户点击通知时

以下是我在 AppDelegate.cs 中实现的功能：

public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
    global::Xamarin.Forms.Forms.Init();
    Firebase.Core.App.Configure();
    FireBaseRegistration();
    return base.FinishedLaunching(app, options);
}


private void FireBaseRegistration()
{
    // Register your app for remote notifications.
    if (UIDevice.CurrentDevice.CheckSystemVersion(10, 0))
    {
        // iOS 10 or later
        var authOptions = UNAuthorizationOptions.Alert | UNAuthorizationOptions.Badge | UNAuthorizationOptions.Sound;
        UNUserNotificationCenter.Current.RequestAuthorization(authOptions, (granted, error) => {
            Console.WriteLine(granted);
        });

        // For iOS 10 display notification (sent via APNS)
        UNUserNotificationCenter.Current.Delegate = this;
    }
    else
    {  
        // iOS 9 or before
        var allNotificationTypes = UIUserNotificationType.Alert | UIUserNotificationType.Badge | UIUserNotificationType.Sound;
        var settings = UIUserNotificationSettings.GetSettingsForTypes(allNotificationTypes, null);
        UIApplication.SharedApplication.RegisterUserNotificationSettings(settings);
    }

    //Register for APNs notifications
    UIApplication.SharedApplication.RegisterForRemoteNotifications();

    Messaging.SharedInstance.Delegate = this;

    var token = InstanceId.SharedInstance.Token;
    Debug.WriteLine(token);

    //////Connect to FCM (Only used for Foreground notifications)
    Messaging.SharedInstance.ShouldEstablishDirectChannel = true;

    // Monitor token generation
    InstanceId.Notifications.ObserveTokenRefresh((sender, e) => {
        // Note that this callback will be fired everytime a new token is generated, including the first
        // time. So if you need to retrieve the token as soon as it is available this is where that
        // should be done.
        token = InstanceId.SharedInstance.Token;
        Console.WriteLine(token);

    });

}


//Register APNs token because method swizzling is de-activated
public override void RegisteredForRemoteNotifications(UIApplication application, NSData deviceToken)
{
    Console.WriteLine("Registered for remote notifications");
    Console.WriteLine(deviceToken.GetBase64EncodedString(NSDataBase64EncodingOptions.None));
    Console.WriteLine(deviceToken);
}



[Export("messaging:didReceiveMessage:")]
public void DidReceiveMessage(Messaging messaging, RemoteMessage remoteMessage)
{
    // Do your magic to handle the notification data
    Console.WriteLine("iOS 11 Foreground");
}


//Shows local notification and is called when user taps notification
[Export("userNotificationCenter:DidReceiveRemoteNotification:withCompletionHandler:")]
public override void DidReceiveRemoteNotification(UIApplication application, NSDictionary userInfo, Action<UIBackgroundFetchResult> completionHandler)
{
    Console.WriteLine("Received a notficaiton");
    completionHandler(UIBackgroundFetchResult.NewData);
}

//To receive notifications in foreground on iOS 11 devices.
[Export("userNotificationCenter:willPresent:withCompletionHandler:")]
public void WillPresent(UNUserNotificationCenter center, UNNotification notification, Action<UNNotificationPresentationOptions> completionHandler)
{
    Console.WriteLine("Handling iOS 11 foreground notification");
    completionHandler(UNNotificationPresentationOptions.Sound | UNNotificationPresentationOptions.Alert);
}

////Called when tapping notification
[Export("userNotificationCenter:didReceiveNotificationResponse:withCompletionHandler:")]
public void DidReceiveNotificationResponse(UNUserNotificationCenter center, UNNotificationResponse response, Action completionHandler)
{
    Console.WriteLine("Handling push notificaiton interaction");
    completionHandler();
}

//Receive data message on iOS 10 devices.
public void ApplicationReceivedRemoteMessage(RemoteMessage remoteMessage)
{
    Console.WriteLine("Handling iOS 10 data message notification");
}   

//// To receive notifications in foreground on iOS 10 devices.
[Export("userNotificationCenter:willPresentNotification:withCompletionHandler:")]
public void WillPresentNotification(UNUserNotificationCenter center, UNNotification notification, Action<UNNotificationPresentationOptions> completionHandler)
{
    Console.WriteLine("Handling foreground notification");
    completionHandler(UNNotificationPresentationOptions.Alert);
}

我已经在 iOS 10.3.3 和 iOS 11.2 上尝试过这些。以下是两个版本调用的函数：

1. 当应用程序在前台时
   • 在 iOS 10.3.3 上：WillPresentNotification()（带有和不带有 "content-available" 标签）
   • 在 iOS 11.2 上：WillPresentNotification()（带有和不带有 "content-available" 标签）
2. 当应用程序在后台时：
   • 在 iOS 10.3.3 上：什么都不应该是 DidReceiveRemoteNotification？
   • 在 iOS 11.2 上：什么都不应该是 DidReceiveRemoteNotification？

我在 Info.plist 文件中激活了远程通知和后台获取后台模式。

包裹信息：

• Xamarin.forms：2.5.0.280555
• Xamarin.Firebase.iOS.CloudMessage：2.0.4.1
• Xamarin.Firebase.iOS.Core：4.0.13
• Xamarin.Firebase.iOS.InstanceID：2.0.8

备注：

DidReceiveMessage 函数在 Xamarin 示例中实现，但就我而言，从未调用过。

当用户点击通知时会调用DidReceiveNotificationResponse。

WillPresent 也永远不会被调用。

我尝试过通过 firebase API 和直接通过 APNs（使用推送器应用程序）发送通知。

Answer 1

设置Messaging.SharedInstance.ShouldEstablishDirectChannel=false 并发送纯数据消息。