---
title: shadowBlurRadius
framework: appkit
role: symbol
role_heading: Instance Property
path: appkit/nsshadow/shadowblurradius
---

# shadowBlurRadius

The blur radius of the shadow.

## Declaration

```swift
var shadowBlurRadius: CGFloat { get set }
```

## Discussion

Discussion This property contains the shadow’s blur radius, as measured in the default user coordinate space. A value of 0 produces no blur, while larger values produce an increasingly large blurred shadow. This value must not be negative. The default value is 0.

## See Also

### Managing a shadow

- [shadowOffset](appkit/nsshadow/shadowoffset.md)
- [shadowColor](appkit/nsshadow/shadowcolor.md)