---
title: VNDetectBarcodesRequestRevision1
framework: vision
role: symbol
role_heading: Global Variable
path: vision/vndetectbarcodesrequestrevision1
---

# VNDetectBarcodesRequestRevision1

A constant for specifying revision 1 of the barcode detection request.

## Declaration

```swift
var VNDetectBarcodesRequestRevision1: Int { get }
```

## See Also

### Identifying Request Revisions

- [VNDetectBarcodesRequestRevision3](vision/vndetectbarcodesrequestrevision3.md)
- [VNDetectBarcodesRequestRevision2](vision/vndetectbarcodesrequestrevision2.md)