---
title: "dataScannerDidZoom(_:)"
framework: visionkit
role: symbol
role_heading: Instance Method
path: "visionkit/datascannerviewcontrollerdelegate/datascannerdidzoom(_:)"
---

# dataScannerDidZoom(_:)

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

## Declaration

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

## Parameters

- `dataScanner`: The data scanner whose zoom factor changes.

## Discussion

Discussion The data scanner invokes this method when the zoomFactor property changes.