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# dataScannerDidZoom(_:)

Responds when a person or your code changes the zoom factor.

```
@MainActor func dataScannerDidZoom(_ dataScanner: DataScannerViewController)
```

## Parameters

`dataScanner`

The data scanner whose zoom factor changes.

## Discussion

The data scanner invokes this method when the
[`zoomFactor`](/documentation/VisionKit/DataScannerViewController/zoomFactor) property changes.

---

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