---
title: scaleSpeed
framework: quartzcore
role: symbol
role_heading: Instance Property
path: quartzcore/caemittercell/scalespeed
---

# scaleSpeed

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

## Declaration

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

## Discussion

Discussion The speed change is defined as the rate of change per second. The default value of this property is 0.0.

## See Also

### Setting Emitter Cell Temporal Attributes

- [lifetime](quartzcore/caemittercell/lifetime.md)
- [lifetimeRange](quartzcore/caemittercell/lifetimerange.md)
- [birthRate](quartzcore/caemittercell/birthrate.md)
- [velocity](quartzcore/caemittercell/velocity.md)
- [velocityRange](quartzcore/caemittercell/velocityrange.md)
- [xAcceleration](quartzcore/caemittercell/xacceleration.md)
- [yAcceleration](quartzcore/caemittercell/yacceleration.md)
- [zAcceleration](quartzcore/caemittercell/zacceleration.md)