# UIConfigurationColorTransformer A transformer that generates a modified output color from an input color. ``` struct UIConfigurationColorTransformer ``` ## Overview A color transformer takes an input color and modifies it to produce a different output color. For example, you might have a color transformer that returns a grayscale or reduced alpha version of the input color. Because color transformers can use the same base input color to produce a number of variants of that color, you can create different appearances for different states of your views. ## Topics ### Creating a color transformer [`init((UIColor) -> UIColor)`](/documentation/UIKit/UIConfigurationColorTransformer-swift.struct/init(_:)) Creates a color transformer with the specified closure. [`static let grayscale: UIConfigurationColorTransformer`](/documentation/UIKit/UIConfigurationColorTransformer-swift.struct/grayscale) Creates a color transformer that generates a grayscale version of the color. [`static let preferredTint: UIConfigurationColorTransformer`](/documentation/UIKit/UIConfigurationColorTransformer-swift.struct/preferredTint) A color transformer that returns the preferred system accent color. [`static let monochromeTint: UIConfigurationColorTransformer`](/documentation/UIKit/UIConfigurationColorTransformer-swift.struct/monochromeTint) A color transformer that returns the color with a monochrome tint. ### Calling the color transformer [`let transform: (UIColor) -> UIColor`](/documentation/UIKit/UIConfigurationColorTransformer-swift.struct/transform) The transform closure of the color transformer. [`func callAsFunction(UIColor) -> UIColor`](/documentation/UIKit/UIConfigurationColorTransformer-swift.struct/callAsFunction(_:)) Calls the transform closure of the color transformer. --- Copyright © 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)