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# connect(to:completionHandler:)

Connects the reader session to a tag and activates that tag.

```
@preconcurrency func connect(to tag: NFCTag, completionHandler: @escaping @Sendable ((any Error)?) -> Void)
```

## Parameters

`tag`

A tag to which the reader session should attempt to connect.

`completionHandler`

A handler that the reader session invokes after completing the tag-connect request. The handler has the following parameter:

- error: `nil` when the session successfully connects to the tag; otherwise, an <doc://com.apple.documentation/documentation/Swift/Error> object.

    The session calls     `completionHandler`     on the dispatch queue provided when creating the [`NFCTagReaderSession`](/documentation/CoreNFC/NFCTagReaderSession)    .

## Discussion

A tag stays connected until your app connects to a different tag or restarts polling. Connecting to a tag that is already connected has no effect.

---

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