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# previewInteractionShouldBegin(_:)

Asks the delegate whether a preview interaction is allowed to begin.

```
optional func previewInteractionShouldBegin(_ previewInteraction: UIPreviewInteraction) -> Bool
```

## Parameters

`previewInteraction`

The preview interaction that’s responding to user input.

## Return Value

<doc://com.apple.documentation/documentation/Swift/true> if the preview interaction should continue into the preview and commit phases; otherwise <doc://com.apple.documentation/documentation/Swift/false>.

## Discussion

If you don’t implement this optional method, the default return value of <doc://com.apple.documentation/documentation/Swift/true> is assumed.

When <doc://com.apple.documentation/documentation/Swift/false>, no further delegate calls are made for the specified preview interaction until the user restarts the 3D Touch interaction.

---

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