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# CIQRCodeDescriptor

A concrete subclass of the Core Image Barcode Descriptor that represents a square QR code symbol.

```
class CIQRCodeDescriptor
```

## Overview

ISO/IEC 18004 defines versions from 1 to 40, where a higher symbol version indicates a
larger data-carrying capacity.
QR Codes can encode text, vCard contact information, or Uniform Resource Identifiers (URI).

## Topics

### Creating a Descriptor

[`init(payload:symbolVersion:maskPattern:errorCorrectionLevel:)`](/documentation/CoreImage/CIQRCodeDescriptor/init(payload:symbolVersion:maskPattern:errorCorrectionLevel:))

Initializes a QR code descriptor for the given payload and parameters.

[`descriptorWithPayload:symbolVersion:maskPattern:errorCorrectionLevel:`](/documentation/CoreImage/CIQRCodeDescriptor/descriptorWithPayload:symbolVersion:maskPattern:errorCorrectionLevel:)

Creates a QR code descriptor for the given payload and parameters.

### Examining a Descriptor

[`errorCorrectedPayload`](/documentation/CoreImage/CIQRCodeDescriptor/errorCorrectedPayload-swift.property)

The error-corrected codeword payload that comprises the QR code symbol.

[`symbolVersion`](/documentation/CoreImage/CIQRCodeDescriptor/symbolVersion-swift.property)

The version of the QR code which corresponds to the size of the QR code symbol.

[`maskPattern`](/documentation/CoreImage/CIQRCodeDescriptor/maskPattern-swift.property)

The data mask pattern for the QR code symbol.

[`errorCorrectionLevel`](/documentation/CoreImage/CIQRCodeDescriptor/errorCorrectionLevel-swift.property)

The error correction level of the QR code symbol.

### Error Correction Constants

[`CIQRCodeDescriptor.ErrorCorrectionLevel`](/documentation/CoreImage/CIQRCodeDescriptor/ErrorCorrectionLevel-swift.enum)

Constants indicating the percentage of the symbol that is dedicated to error correction.


---

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