callAsFunction(_:)

Declaration

func callAsFunction(_ input: AttributeContainer) -> AttributeContainer

Parameters

• input:

  The current attributes container for a string.

Return Value

A new, transformed attributes container.

Discussion

Using this syntax, you can call the text attributes transformer type as if it were a closure:

var container = AttributeContainer()
container.backgroundColor = UIColor.blue
let transformer = UIConfigurationTextAttributesTransformer { incoming in
    var outgoing = incoming
    outgoing.backgroundColor = incoming.backgroundColor?.withAlphaComponent(0.6)
    return outgoing
}
let transformed = transformer.callAsFunction(container)