---
title: rollAngle
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avmetadatafaceobject/rollangle
---

# rollAngle

The roll angle of the face specified in degrees.

## Declaration

```swift
var rollAngle: CGFloat { get }
```

## Discussion

Discussion The roll angle represents the side-to-side tilt of the face relative to the metadata’s bounding rectangle. A value of 0.0 yields a face that is level relative to the picture, whereas a value of 90 yields a face that is perpendicular relative to the picture. You must check the value of the hasRollAngle property before accessing this property. If the value in the hasRollAngle property is false, reading the value in this property raises an exception.

## See Also

### Accessing the face detection data

- [hasRollAngle](avfoundation/avmetadatafaceobject/hasrollangle.md)
- [hasYawAngle](avfoundation/avmetadatafaceobject/hasyawangle.md)
- [yawAngle](avfoundation/avmetadatafaceobject/yawangle.md)