reverseTransformedValue(_:)
Returns the result of the reverse transformation of a given value.
Declaration
func reverseTransformedValue(_ value: Any?) -> Any?Parameters
- value:
The value to reverse transform.
Return Value
The reverse transformation of value.
Discussion
The default implementation raises an exception if allowsReverseTransformation() returns false; otherwise it will invoke transformedValue(_:) with value.
A subclass should override this method if they require a reverse transformation that is not the same as simply reapplying the original transform (as would be the case with negation, for example). For example, if a value transformer converts a value in Fahrenheit to Celsius, this method would converts a value from Celsius to Fahrenheit.