<!--
{
  "availability" : [
    "iOS: 3.0.0 -",
    "iPadOS: 3.0.0 -",
    "macCatalyst: 13.1.0 -",
    "macOS: 10.3.0 -",
    "tvOS: 9.0.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 2.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Foundation",
  "identifier" : "/documentation/Foundation/ValueTransformer/allowsReverseTransformation()",
  "metadataVersion" : "0.1.0",
  "role" : "Type Method",
  "symbol" : {
    "kind" : "Type Method",
    "modules" : [
      "Foundation"
    ],
    "preciseIdentifier" : "c:objc(cs)NSValueTransformer(cm)allowsReverseTransformation"
  },
  "title" : "allowsReverseTransformation()"
}
-->

# allowsReverseTransformation()

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

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

## Return Value

<doc://com.apple.documentation/documentation/Swift/true> if the receiver supports reverse value transformations, otherwise <doc://com.apple.documentation/documentation/Swift/false>.

  The default is   <doc://com.apple.documentation/documentation/Swift/true>  .

## Discussion

Subclasses should override this method to return <doc://com.apple.documentation/documentation/Swift/false> if they do not support reverse value transformations.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)