---
title: implementorValueFromStringCallback
framework: audiotoolbox
role: symbol
role_heading: Instance Property
path: audiotoolbox/auparameternode/implementorvaluefromstringcallback
---

# implementorValueFromStringCallback

The callback for converting a string to a parameter value.

## Declaration

```swift
var implementorValueFromStringCallback: AUImplementorValueFromStringCallback { get set }
```

## See Also

### Audio Unit Implementations

- [implementorValueObserver](audiotoolbox/auparameternode/implementorvalueobserver.md)
- [implementorValueProvider](audiotoolbox/auparameternode/implementorvalueprovider.md)
- [implementorStringFromValueCallback](audiotoolbox/auparameternode/implementorstringfromvaluecallback.md)
- [implementorDisplayNameWithLengthCallback](audiotoolbox/auparameternode/implementordisplaynamewithlengthcallback.md)