在iOS通知屏幕Xamarin中显示通知的格式

Question

Is there a way to change how the text is displayed in notification area on ios >10?

For example, currently I am sending json string as the notification that contains the necessary info for the app, and in the notification area on the lock screen or pull down menu it is displaying that json string. Is there a way to customize the text that gets displayed there?

I have searched around, but the things I have found have not helped. I can handle the display of the notification when the app is in the foreground.

If it is not directly possible, would sending the notification as a silent one and then pushing a formatted notification to ios notification area be possible?

My template for reference:

const string templateBodyAPNS = "{\"aps\":{\"alert\":\"$(messageParam)\", \"category\": \"test\"}}";

I have tried with mutable content 1, also didnt work.

The code of my extension:

using System;
using UIKit;
using UserNotifications;
using UserNotificationsUI;

namespace NotificationContentExtension
{
    public partial class NotificationViewController : UIViewController, IUNNotificationContentExtension
    {
        protected NotificationViewController(IntPtr handle) : base(handle)
        {
            // Note: this .ctor should not contain any initialization logic.
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            // Do any required interface initialization here.
        }

        public void DidReceiveNotification(UNNotification notification)
        {
            label.Text = "Hello";
            new UIAlertView("Received", "Working", null, "Ok").Show();
        }
    }
}

Answer 1

You need to add a Notification Service Extension to your Xamarin.iOS project in order to customize the way the push notification is presented.

1.In Visual Studio go to File/new Project/Visual C#/iOS Exensions/Notification Service Extension.

2. The Notification Service must have a bundle name that has the iOS project as the prefix:

   iOS project bundle id: www.companyname.iosappname

   Extension bundle id: www.companyname.iosappname.extensionname

3. Need to add a reference to the iOS project that points to the extension. So right click on the iOS project, add reference and select the extension project.

4. Currently in Visual Studio after you add the Extension reference to the iOS project you will only be able to run the iOS project in Release mode, not in Debug mode. If you try in Debug mode you will get an error. To run in debug mode, remove the Extension reference first from the iOS Project.

5. You need to change the APNS format to:

   const string templateBodyAPNS = @"{ ""aps"" : { ""alert"" : ""$(messageParam)"", ""mutable-content"": 1 }, }";

   Adding "mutable-content":1 signals that a Notification Service will intercept the push notification.

6. The Notification Service Extension cannot exchange data with the main iOS project. In order to share data between the two you will need to create an App Group on the Apple Developer website. Make sure you add the app group to both projects in their Entitlements.plist files and also on the Apple Developer Website.

7. You need to activate push notifications on the Apple Developer Website for both your project and the Notification Service Extension and also create certificates and provisioning profiles for both.

8. Only publish the iOS Project, the Extension is automatically included.

Let me know if you have any more questions.