# objc_lookUpClass(_:) Returns the class definition of a specified class. ``` func objc_lookUpClass(_ name: UnsafePointer) -> AnyClass? ``` ## Parameters `name` The name of the class to look up. ## Return Value The Class object for the named class, or `nil` if the class is not registered with the Objective-C runtime. ## Discussion The implementation of this function is identical to the implementation of the [`objc_getClass(_:)`](/documentation/ObjectiveC/objc_getClass(_:)) function. --- 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)