<!--
{
  "availability" : [
    "iOS: 5.0.0 -",
    "iPadOS: 5.0.0 -",
    "macCatalyst: 13.1.0 -",
    "macOS: 10.6.0 -",
    "tvOS: 9.0.0 -",
    "visionOS: 1.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "QuartzCore",
  "identifier" : "/documentation/QuartzCore/CAEmitterCell/scale",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "Core Animation"
    ],
    "preciseIdentifier" : "c:objc(cs)CAEmitterCell(py)scale"
  },
  "title" : "scale"
}
-->

# scale

Specifies the scale factor applied to the cell. Animatable.

```
var scale: CGFloat { get set }
```

## Discussion

The scale of the cell will vary by a random amount within the range specified by [`scaleRange`](/documentation/QuartzCore/CAEmitterCell/scaleRange). The [`scaleSpeed`](/documentation/QuartzCore/CAEmitterCell/scaleSpeed) property determines the rate of change.

The default value of this property is `1.0`.

## See Also

[`scaleSpeed`](/documentation/QuartzCore/CAEmitterCell/scaleSpeed)

The speed at which the scale changes over the lifetime of the cell. Animatable.



---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)