# sel_registerName(_:) Registers a method with the Objective-C runtime system, maps the method name to a selector, and returns the selector value. ``` func sel_registerName(_ str: UnsafePointer) -> Selector ``` ## Parameters `str` A pointer to a C string. Pass the name of the method you wish to register. ## Return Value A pointer of type [`SEL`](/documentation/ObjectiveC/SEL) specifying the selector for the named method. ## Discussion You must register a method name with the Objective-C runtime system to obtain the method’s selector before you can add the method to a class definition. If the method name has already been registered, this function simply returns the selector. --- 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)