如何在xamarin.forms中使用CoreNFC？

<key>NFCReaderUsageDescription</key>
<string>我们需要使用NFC来读取标签信息。</string>

using CoreNFC;
using Foundation;
using System;
using Xamarin.Forms;

[Register("NFCHandler")]
public class NFCHandler : NFCNDEFReaderSessionDelegate
{
    private readonly Action<string> _messageReceived;

    public NFCHandler(Action<string> messageReceived)
    {
        _messageReceived = messageReceived;
    }

    public override void DidDetectNDEFs(NFCNDEFReaderSession session, NDEFMessage[] messages)
    {
        foreach (var message in messages)
        {
            foreach (var record in message.Records)
            {
                var payload = Encoding.UTF8.GetString(record.Payload);
                _messageReceived(payload);
            }
        }
        session.InvalidateSession();
    }

    public override void DidInvalidateSession(NFCNDEFReaderSession session, NSError error)
    {
        // Handle errors
    }
}

public partial class NFCPage : ContentPage
{
    public NFCPage()
    {
        InitializeComponent();
    }

    private async void StartNFCScan(object sender, EventArgs e)
    {
        var handler = new NFCHandler(message =>
        {
            Device.BeginInvokeOnMainThread(() =>
            {
                DisplayAlert("NFC Tag Detected", message, "OK");
            });
        });

        await Task.Run(() =>
        {
            var options = new NFCNDEFReaderSessionOptions
            {
                AlertMessage = "请将设备靠近NFC标签。",
                InvalidateAfterFirstRead = true
            };

            NFCNDEFReaderSession.FromQueue().ContinueWith(t =>
            {
                if (t.Exception != null)
                {
                    // Handle exception
                }
                else
                {
                    t.Result.BeginSession(options, handler);
                }
            });
        });
    }
}