---
title: allowsReverseTransformation()
framework: foundation
role: symbol
role_heading: Type Method
path: foundation/valuetransformer/allowsreversetransformation()
---

# allowsReverseTransformation()

Returns a Boolean value that indicates whether the receiver can reverse a transformation.

## Declaration

```swift
class func allowsReverseTransformation() -> Bool
```

## Return Value

Return Value true if the receiver supports reverse value transformations, otherwise false. The default is true.

## Discussion

Discussion Subclasses should override this method to return false if they do not support reverse value transformations.

## See Also

### Getting Information About a Transformer

- [transformedValueClass()](foundation/valuetransformer/transformedvalueclass().md)