Reading UIDs of NFC Cards in iOS 13

Question

I would like to retrive the UID of MiFare cards. I\'m using an iPhone X, Xcode 11 and iOS 13.

I\'m aware this wasn\'t possible (specifically reading the UID) until

Answer 1

I know you have said that it returns nil but for clarity for future readers:

Assuming it is not a Felica tag, it should be on the identifier field when it is detected:

func tagReaderSession(_ session: NFCTagReaderSession, didDetect tags: [NFCTag]) {      
  if case let NFCTag.miFare(tag) = tags.first! {
    print(tag.identifier as NSData)
  }
}

But in your case, it's empty (see edit below). For most tags the APDU to get the UID of a tag is

  0xff // Class
  0xca // INS
  0x00 // P1
  0x00 // P2
  0x00 // Le

so you could try using tag.sendMiFareCommand to send that command manually.

Edit: Response from OP, it wasn't empty but was unclear because printing Data in Swift doesn't show in console