jpd21122012

public partial class MainPage : ContentPage
{
    private readonly INfcService _nfcService;

    public MainPage(INfcService nfcService)
    {
        _nfcService = nfcService;
        InitializeComponent();
    }

jpd21122012

<VerticalStackLayout>
    <Button Text="Read NFC Tag" Clicked="OnReadClicked" />
    <Button Text="Write to NFC Tag" Clicked="OnWriteClicked" />
    <Label x:Name="OutputLabel" Text="NFC Output will appear here" />
</VerticalStackLayout>

jpd21122012

public Task<bool> WriteTagAsync(string text)
{
    // iOS uses NFCNDEFReaderSession with write capability
    var record = new NFCNDEFPayload(
        NFCTypeNameFormat.NFCWellKnown,
        "T".ToArray(), // Text type
        "en".ToArray(),
        text.ToArray()
    );
    // Write using NFCNDEFReaderSession

jpd21122012

public async Task<bool> WriteTagAsync(string text)
{
    NdefMessage ndefMessage = new NdefMessage(
        new NdefRecord[] { 
            NdefRecord.CreateTextRecord("en", text) 
        }
    );
    // Write to tag using Ndef.WriteNdefMessage
    return true;
}

jpd21122012

builder.Services.AddSingleton<INfcService>(_ =>
{
#if ANDROID
    return new NfcServiceAndroid();
#elif IOS
    return new NfcServiceiOS();
#else
    return null;
#endif
});

jpd21122012

using CoreNFC;

public class NfcServiceiOS : INfcService
{
    private NFCNdefReaderSession _nfcSession;

    public Task<string> ReadTagAsync()
    {
        // Start an NFC reader session
        _nfcSession = new NFCNdefReaderSession(this, null, true);

jpd21122012

using Android.Nfc;
using Android.Nfc.Tech;

public class NfcServiceAndroid : INfcService
{
    public async Task<string> ReadTagAsync()
    {
        // Implementation using Android.Nfc
        // Example: Listen for NDEF messages
        return await Task.FromResult("NFC Tag Data from Android");

jpd21122012

public interface INfcService
{
    Task<string> ReadTagAsync();
    Task<bool> WriteTagAsync(string text);
}

jpd21122012

<key>NFCReaderUsageDescription</key>
<string>This app uses NFC to read and write tags</string>
<key>com.apple.developer.nfc.readersession.formats</key>
<array>
    <string>NDEF</string>
</array>

jpd21122012

<uses-permission android:name="android.permission.NFC" />
<uses-feature android:name="android.hardware.nfc" android:required="true" />