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Debugging CoreNFC not working

How to programmatically work CoreNFC on xcode-9

func readerSession(_ session: NFCNDEFReaderSession, didInvalidateWithError error: Error) {
    //What I need to do here
}

func readerSession(_ session: NFCNDEFReaderSession, didDetectNDEFs messages: [NFCNDEFMessage]) {
    //What I need to do here
}

override func viewDidLoad() {
    super.viewDidLoad()

    let sessionReader = NFCNDEFReaderSession.init(delegate: self, queue: nil, invalidateAfterFirstRead: true)
    let nfcSession = NFCReaderSession.self

    let nfcTag = NFCTagCommandConfiguration.init()
    let tagType = NFCTagType(rawValue: 0)

    sessionReader.begin()

}

I want to know what I need to do to read some NFC tag.

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1 answer


There are four steps to make it work:

  • Add NFC tag permission to your App ID in the Apple Developer Portal.

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  1. Add a code signing file to your project and create parameters and add the following raw key and value:


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  1. Add a usage description to your Info.plist:

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  1. Inject a delegate and pass it to NFCNDEFReaderSession

    init like this:

    import UIKit
import CoreNFC

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, NFCNDEFReaderSessionDelegate {

var window: UIWindow?
var session: NFCNDEFReaderSession?

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    session = NFCNDEFReaderSession(delegate: self, queue: nil, invalidateAfterFirstRead: false)
    self.session?.begin()
    return true
}


func readerSession(_ session: NFCNDEFReaderSession, didInvalidateWithError error: Error) {
    print(error)
}

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

    }

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