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# NFCReaderSessionProtocol

A general interface for interacting with a reader session.

```
protocol NFCReaderSessionProtocol : NSObjectProtocol
```

## Topics

### Determining Reader Session Readiness

[`var isReady: Bool`](/documentation/CoreNFC/NFCReaderSessionProtocol/isReady)

A Boolean value that indicates whether the reader session is started and ready to use.

[`var isReady: Bool`](/documentation/CoreNFC/NFCReaderSessionProtocol/isReady)

A Boolean value that indicates whether the reader session is started and ready to use.

### Managing a Reader Session

[`func begin()`](/documentation/CoreNFC/NFCReaderSessionProtocol/begin())

Starts the reader session.

[`func invalidate()`](/documentation/CoreNFC/NFCReaderSessionProtocol/invalidate())

Closes the reader session, which prevents it from being reused.

[`func invalidate(errorMessage: String)`](/documentation/CoreNFC/NFCReaderSessionProtocol/invalidate(errorMessage:))

Closes the reader session and displays an error message to the user.

[`var alertMessage: String`](/documentation/CoreNFC/NFCReaderSessionProtocol/alertMessage)

A custom description that helps users understand how they can use NFC reader mode in your app.

[`func begin()`](/documentation/CoreNFC/NFCReaderSessionProtocol/begin())

Starts the reader session.

[`func invalidate()`](/documentation/CoreNFC/NFCReaderSessionProtocol/invalidate())

Closes the reader session, which prevents it from being reused.

[`func invalidate(errorMessage: String)`](/documentation/CoreNFC/NFCReaderSessionProtocol/invalidate(errorMessage:))

Closes the reader session and displays an error message to the user.

[`var alertMessage: String`](/documentation/CoreNFC/NFCReaderSessionProtocol/alertMessage)

A custom description that helps users understand how they can use NFC reader mode in your app.

## Relationships

### Inherits From

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

### Conforming Types

[`NFCReaderSession-swift.class`](/documentation/CoreNFC/NFCReaderSession-swift.class)

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

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

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

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

---

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