CoreNFC debug not working

Question

How 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 for read some NFC tag.

Answer 1

There are four steps to get it working:

1. Add the NFC Tag permission to your App Identifier in the Apple developer portal

2. Add a Code Signing Entitlement file to your project and build settings and add the following raw key and value:

3. Add the usage description to your Info.plist:

4. Implement the delegate and pass it to the 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)
       }
   
   }