NFC scanning session not detecting tags

Question

dzung_imclutch OP

Created 6d

Replies 2

Boosts 0

Participants 2

Some background:

We are developing an app that needs to scan NFC tags
We are following this documentation for our app
We (assume) we've gotten all the correct entitlements for our app
Our app correctly shows the NFC scanning prompt
We are using up-to-date iPhones to test
We tested scanning using a different NFC app on the app store and were able to successfully scan the tag
We're using NFC NDEF tags to test

The problem:

Nothing is being detected in the scan
Nothing in the example application when we downloaded it down and loaded it onto a test device (reminder that the app from the app store was able to read our tag)
When connected to the debugger, our delegate function is not firing (tested with breakpoints and print statements). The following is the signature of our delegate function:

func readerSession(_ session: NFCNDEFReaderSession, didDetectNDEFs messages: [NFCNDEFMessage])

Is there something that we're missing to get the NFC scanning to work? Perhaps some kind of entitlement? If anyone has any ideas or paths to follow that'd be greatly appreciated. Thanks!

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Answer 1

Engineer OP

Apple

6d

Would like to clarify one thing in the sample you are working from. That sample includes both the readerSession(_:didDetectNDEFs:) and the readerSession(_:didDetect:) functions, for demonstrating their use, but as indicated in the documentation, the existence of the latter overrides the former, and you would not get a callback to readerSession(_:didDetectNDEFs:) without removing the other one first.

Argun Tekant /  DTS Engineer / Core Technologies

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Answer 2

dzung_imclutch OP

5d

Thanks, I see that now. We are currently only implementing the following methods:

func readerSession(_ session: NFCNDEFReaderSession, didInvalidateWithError error: any Error)

func readerSessionDidBecomeActive(_ session: NFCNDEFReaderSession)

func beginScanning()

func readerSession(_ session: NFCNDEFReaderSession, didDetectNDEFs messages: [NFCNDEFMessage])

and are still not getting any scans. We also tried the sample code with the func readerSession(_ session: NFCNDEFReaderSession, didDetect tags: [NFCNDEFTag]) commented out and are still not getting any scans.

0