<!--
{
  "availability" : [
    "iOS: 13.0.0 -",
    "iPadOS: 13.0.0 -",
    "macCatalyst: 13.1.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "CoreNFC",
  "identifier" : "/documentation/CoreNFC/NFCVASReaderSessionDelegate",
  "metadataVersion" : "0.1.0",
  "role" : "Protocol",
  "symbol" : {
    "kind" : "Protocol",
    "modules" : [
      "Core NFC"
    ],
    "preciseIdentifier" : "c:objc(pl)NFCVASReaderSessionDelegate"
  },
  "title" : "NFCVASReaderSessionDelegate"
}
-->

# NFCVASReaderSessionDelegate

A protocol that an object implements to receive callbacks from a VAS reader session.

```
protocol NFCVASReaderSessionDelegate : NSObjectProtocol
```

## Topics

### Handling Session Activation

[`readerSessionDidBecomeActive(_:)`](/documentation/CoreNFC/NFCVASReaderSessionDelegate/readerSessionDidBecomeActive(_:))

Tells the delegate that the reader session is active.

### Receiving VAS Responses

[`readerSession(_:didReceive:)`](/documentation/CoreNFC/NFCVASReaderSessionDelegate/readerSession(_:didReceive:))

Tells the delegate that the reader session received a VAS response.

[`NFCVASResponse`](/documentation/CoreNFC/NFCVASResponse)

An object representing the response from a single `GET VAS DATA` command.

### Handling an Invalidated Session

[`readerSession(_:didInvalidateWithError:)`](/documentation/CoreNFC/NFCVASReaderSessionDelegate/readerSession(_:didInvalidateWithError:))

Tells the delegate that the session become invalid and provides the reason.


---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)