---
title: negateBooleanTransformerName
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/nsvaluetransformername/negatebooleantransformername
---

# negateBooleanTransformerName

This value transformer negates a boolean value, transforming true to false and false to true.

## Declaration

```swift
static let negateBooleanTransformerName: NSValueTransformerName
```

## Discussion

Discussion This transformer is reversible.

## See Also

### Type Properties

- [isNilTransformerName](foundation/nsvaluetransformername/isniltransformername.md)
- [isNotNilTransformerName](foundation/nsvaluetransformername/isnotniltransformername.md)
- [keyedUnarchiveFromDataTransformerName](foundation/nsvaluetransformername/keyedunarchivefromdatatransformername.md)
- [unarchiveFromDataTransformerName](foundation/nsvaluetransformername/unarchivefromdatatransformername.md)
- [secureUnarchiveFromDataTransformerName](foundation/nsvaluetransformername/secureunarchivefromdatatransformername.md)