public async Task WriteNdefAsync(NdefMessage ndefMessage)
{
try
{
await _lockSemaphore.WaitAsync();
if (!_isSessionEnabled)
{
throw new Exception("NFC is not enabled");
}
var tcs = new TaskCompletionSource <object>();
var iosNdefMessage = new NFCNdefMessage(ndefMessage.ToList().Select(record => new NFCNdefPayload
(
format: (NFCTypeNameFormat)record.TypeNameFormat,
type: NSData.FromArray(record.Type),
identifier: NSData.FromArray(record.Id),
payload: NSData.FromArray(record.Payload)
)).ToArray());
_tag.WriteNdef(iosNdefMessage, (error) =>
{
if (error != null)
{
throw new Exception(error.Description);
}
tcs.SetResult(null);
});
await tcs.Task;
}
finally
{
_lockSemaphore.Release();
}
}
