Added: iOS Implementation from Borepin

NFC_iOS/Card_iOS.cs

@@ -0,0 +1,66 @@
+//using System;
+//using System.Threading;
+//using NFC.Interfaces;
+//using CoreNFC;
+//using Foundation;
+
+//namespace NFC_iOS
+//{
+//    public class Card_iOS : ICard
+//    {
+//        private NFCTagReaderSession _session;
+//        private INFCMiFareTag _tag;
+
+//        public Card_iOS(NFCTagReaderSession session, INFCMiFareTag tag)
+//        {
+//            _session = session;
+//            _tag = tag;
+//        }
+
+//        public void Connect()
+//        {
+//            var counter = new CountdownEvent(1);
+//            NSError err = null;
+
+//            _session.ConnectTo(_tag, (error) =>
+//            {
+//                err = error;
+//                counter.Signal();
+//            });
+
+//            counter.Wait();
+
+//            if (err != null)
+//            {
+//                throw new Exception(err.LocalizedDescription);
+//            }
+//        }
+
+//        public void Disconnect()
+//        {
+//            // TODO: decide on which should be used
+//            //_session.RestartPolling();
+//            _session.InvalidateSession("card disconnect");
+//        }
+
+//        public APDUResponse Transmit(APDUCommand cmd)
+//        {
+//            var counter = new CountdownEvent(1);
+//            byte[] buf = null;
+
+//            _tag.SendMiFareIso7816Command(new NFCIso7816Apdu(NSData.FromArray(cmd.Data)), (response, sw1, sw2, NSError) =>
+//            {
+//                // reassembly the original apdu message
+//                buf = new byte[response.Length + 2];
+//                response.ToArray().CopyTo(buf, 0);
+//                buf[response.Length + 0] = sw1;
+//                buf[response.Length + 1] = sw2;
+//                counter.Signal();
+//            });
+
+//            counter.Wait();
+
+//            return new APDUResponse(buf);
+//        }
+//    }
+//}

NFC_iOS/Hardware_iOS.cs

@@ -0,0 +1,24 @@
+//using System;
+//using NFC.Interfaces;
+//using CoreNFC;
+
+//namespace NFC_iOS
+//{
+//    public class Hardware_iOS : IHardware
+//    {
+//        public bool IsAvailable()
+//        {
+//            return NFCReaderSession.ReadingAvailable;
+//        }
+
+//        public String[] GetReaders()
+//        {
+//            return new String[] { "main" };
+//        }
+
+//        public IReader OpenReader(String readerID)
+//        {
+//            return new Reader_iOS();
+//        }
+//    }
+//}

NFC_iOS/NFC_iOS.csproj

@@ -4,4 +4,12 @@
     <TargetFramework>netcoreapp3.1</TargetFramework>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Forms" Version="5.0.0.2012" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\NFC\NFC.csproj" />
+  </ItemGroup>
+
 </Project>

NFC_iOS/Reader_iOS.cs

@@ -0,0 +1,65 @@
+//using NFC.Interfaces;
+//using System;
+//using CoreNFC;
+//using Foundation;
+
+//namespace NFC_iOS
+//{
+//    public class Reader_iOS : NFCTagReaderSessionDelegate, IReader
+//    {
+//        public event ReaderEventHandler CardDiscovered;
+//        public event ReaderEventHandler CardLost;
+
+//        private NFCReaderSession _session = null;
+//        private DispatchQueue _queue;
+
+//        public void Start()
+//        {
+//            _queue = new DispatchQueue("NFC Reader Queue", true);
+
+//            // sessions cannot be reused
+//            _session = new NFCTagReaderSession(NFCPollingOption.Iso14443, this, _queue)
+//            {
+//                AlertMessage = "TODO",
+//            };
+
+//            if (_session == null)
+//            {
+//                Console.WriteLine("Oh no! The session is null!");
+//            }
+
+//            _session.BeginSession();
+//        }
+
+//        public void Stop()
+//        {
+//            _session?.InvalidateSession();
+//            _session = null;
+//        }
+
+//        public override void DidDetectTags(NFCTagReaderSession session, INFCTag[] tags)
+//        {
+//            Console.WriteLine("Did detect tags");
+
+//            Console.WriteLine(tags[0].Type);
+
+//            //INFCIso7816Tag tag = tags[0].GetNFCIso7816Tag();
+//            INFCMiFareTag tag = tags[0].GetNFCMiFareTag();
+//            if (tag != null)
+//            {
+//                Console.WriteLine("Card ist valid");
+//                CardDiscovered?.Invoke(this, new Card(session, tag));
+//            }
+//            else
+//            {
+//                Console.WriteLine("Card is not ISO7816");
+//            }
+//        }
+
+//        public override void DidInvalidate(NFCTagReaderSession session, NSError error)
+//        {
+//            // TODO: decide what to do
+//            Console.WriteLine("reader session invalidated");
+//        }
+//    }
+//}