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# NFCTagReaderSessionDelegate

A protocol that an object implements to receive callbacks sent from an NFC tag reader session.

```
protocol NFCTagReaderSessionDelegate : NSObjectProtocol
```

## Topics

### Handling Session Activation

[`tagReaderSessionDidBecomeActive(_:)`](/documentation/CoreNFC/NFCTagReaderSessionDelegate-2joku/tagReaderSessionDidBecomeActive(_:))

Tells the delegate that the reader session is active.

### Finding NFC Tags

[`tagReaderSession(_:didDetect:)`](/documentation/CoreNFC/NFCTagReaderSessionDelegate-2joku/tagReaderSession(_:didDetect:))

Tells the delegate that the session detected NFC tags.

### Handling an Invalidated Session

[`tagReaderSession(_:didInvalidateWithError:)`](/documentation/CoreNFC/NFCTagReaderSessionDelegate-2joku/tagReaderSession(_:didInvalidateWithError:))

Tells the delegate the reason for invalidating a reader session.

## Relationships

### Inherits From

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

---

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