# UIConfigurationTextAttributesTransformer Defines a text transformation that can affect the visual appearance of a string. ``` typedef NSDictionary *(^)(NSDictionary *) UIConfigurationTextAttributesTransformer; ``` ## Discussion Use a transformer to affect how your attributed text appears on the UI. You provide a closure when initializing the transformer. Your closure accepts a container with the current text attributes and returns a container with the new text attributes. ```objc UIConfigurationTextAttributesTransformer transformer; transformer = ^(NSDictionary *incoming) { NSMutableDictionary *outgoing = [incoming mutableCopy]; outgoing[NSForegroundColorAttributeName] = [UIColor blackColor]; outgoing[NSFontAttributeName] = [UIFont boldSystemFontOfSize:20]; return outgoing; }; ``` --- 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)