# SecTransformAttributeActionBlock A block used to override the default attribute handling for when an attribute is set. ``` typealias SecTransformAttributeActionBlock = (SecTransformAttribute, CFTypeRef) -> Unmanaged? ``` ## Parameters `attribute` The attribute whose default is being overridden or NULL if this is a generic notification override `value` Proposed new value for the attribute. ## Return Value The new value of the attribute if successful or a object on failure. If a transform needs to have a as the value of an attribute, then place the object in a container, such as a or object. ## Discussion --- 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)