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  "title" : "NFCNDEFReaderSessionDelegate"
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# NFCNDEFReaderSessionDelegate

A protocol that an object implements to serve as an NDEF reader session delegate.

```
protocol NFCNDEFReaderSessionDelegate : NSObjectProtocol
```

## Topics

### Handling Session Activation

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

Tells the delegate that the reader session is active.

### Finding NDEF Messages and Tags

[`readerSession(_:didDetectNDEFs:)`](/documentation/CoreNFC/NFCNDEFReaderSessionDelegate/readerSession(_:didDetectNDEFs:))

Tells the delegate that the session detected NFC tags with NDEF messages.

[`readerSession(_:didDetect:)`](/documentation/CoreNFC/NFCNDEFReaderSessionDelegate/readerSession(_:didDetect:))

Tells the delegate that the session detected NFC tags with NDEF messages and enables read-write capability for the session.

### Handling an Invalidated Session

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

Tells the delegate the reason for invalidating a reader session.


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