# decodeValue(ofObjCType:at:) Decodes a single value, whose Objective-C type is given by `valueType`. ``` func decodeValue(ofObjCType type: UnsafePointer, at data: UnsafeMutableRawPointer) ``` ## Discussion `valueType` must contain exactly one type code, and the buffer specified by `data` must be large enough to hold the value corresponding to that type code. For information on creating an Objective-C type code suitable for `valueType`, see [Type Encodings](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtTypeEncodings.html#//apple_ref/doc/uid/TP40008048-CH100). Subclasses must override this method and provide an implementation to decode the value. In your overriding implementation, decode the value into the buffer beginning at `data`. This method matches an [`encodeValue(ofObjCType:at:)`](/documentation/Foundation/NSCoder/encodeValue(ofObjCType:at:)) message used during encoding. ## See Also [`decodeValuesOfObjCTypes:`](/documentation/Foundation/NSCoder/decodeValuesOfObjCTypes:) Decodes a series of potentially different Objective-C types. --- 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)