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

# velocity

The initial velocity of the cell. Animatable.

## Declaration

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

## Discussion

Discussion The velocity of the cell will vary by a random amount within the range specified by velocityRange.

## See Also

### Setting Emitter Cell Temporal Attributes

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