# sel_getUid(_:) Registers a method name with the Objective-C runtime system. ``` func sel_getUid(_ 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 The implementation of this method is identical to the implementation of [`sel_registerName(_:)`](/documentation/ObjectiveC/sel_registerName(_:)). ### Version-Notes Prior to OS X version 10.0, this method tried to find the selector mapped to the given name and returned `NULL` if the selector was not found. This was changed for safety, because it was observed that many of the callers of this function did not check the return value for `NULL`. --- 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)