---
title: byValue
framework: quartzcore
role: symbol
role_heading: Instance Property
path: quartzcore/cabasicanimation/byvalue
---

# byValue

Defines the value the receiver uses to perform relative interpolation.

## Declaration

```swift
var byValue: Any? { get set }
```

## Discussion

Discussion See Setting Interpolation Values for details on how byValue interacts with the other interpolation values.

## See Also

### Interpolation values

- [fromValue](quartzcore/cabasicanimation/fromvalue.md)
- [toValue](quartzcore/cabasicanimation/tovalue.md)