---
title: "readerSessionDidBecomeActive(_:)"
framework: corenfc
role: symbol
role_heading: Instance Method
path: "corenfc/nfcvasreadersessiondelegate/readersessiondidbecomeactive(_:)"
---

# readerSessionDidBecomeActive(_:)

Tells the delegate that the reader session is active.

## Declaration

```swift
optional func readerSessionDidBecomeActive(_ session: NFCVASReaderSession)
```

## Parameters

- `session`: The active reader session. Only one session can be active at a time.

## Discussion

Discussion The reader session calls this method after the device begins scanning for new tags.