How to read multiple Mifare cards (not NDEF) on iOS?

[dcanora]

Hello! I asked a version of this question last June but got no response. Asking again to see if anyone has found a solution...

I need to allow the user to read multiple NFC cards, with the app processing the tag value and providing quick "thumbs up/down" feedback to the user between each read. I have no problem doing this on Android but can't seem to get it working on iOS.

On iOS single read is easy enough to implement. But to read multiple cards, the user has to wait or actively dismiss the iOS UI and then press the Start Scanning button again in my app. This is a bit of a kludge and slows them down, so I'd like to find a way to avoid it.

Is there a way in iOS to successfully loop in code to read multiple cards?

Details...

On Android I call .requestTechnology(), .getTag(), .mifareUltralightHandlerAndroid.mifareUltralightReadPages() and .cancelTechnologyRequest(). I then process the value returned, give the user feedback and then repeat the process to read the next card, until canceled by the user.

This doesn't work on iOS. I've separated the calls to .requestTechnology(NfcTech.MifareIOS) and .cancelTechnologyRequest() so they only get called before the first call and when canceled, respectively. I'm trying to use readNfc(), below, to do each nfc read. The first tag reads fine, but when the app calls readNfc() a second time - even though no tag is near the phone - the app behaves like the first tag is still present - .getTag() always immediately returns the first card's data (as shown in a console.log of nfcTag.id) and the call to .sendMifareCommandIOS() always fails, presumably because there is actually no tag to read. No matter what I do, it seems the first card read is somehow still "seen" by .getTag() the second time readNfc() is called.

 const readNfc = async () => {
    let readPages = null;
    console.log("[nfcServices] readNfc Starting...");
    
      try {
          // Wait for tag    
          await NfcManager.setAlertMessageIOS('Scan a card…’);
          const nfcTag = await NfcManager.getTag();
          console.log('[nfcServices] readNfc getTag returned ', nfcTag.id);
          
          // Read one four-page array from tag
          readPages = await NfcManager.sendMifareCommandIOS([0x30, 16]);
          await NfcManager.setAlertMessageIOS(‘Card read!');
          console.log('[nfcServices] readNfc readPages: ', readPages);
      
      } catch (ex) {
          // Error
          console.log('[nfcServices] readNfc ERROR: ', ex);
          NfcManager.cancelTechnologyRequest().catch(() => 0);
      } finally {
          console.log('[nfcServices] readNfc returning: ', readPages);
          return(readPages);
      }
  }