# CGPDFOperatorTableSetCallback(_:_:_:) Sets a callback function for a PDF operator. ``` func CGPDFOperatorTableSetCallback(_ table: CGPDFOperatorTableRef, _ name: UnsafePointer, _ callback: CGPDFOperatorCallback) ``` ## Parameters `table` A PDF operator table. `name` The name of the PDF operator you want to set a callback for. `callback` The callback to invoke for the PDF operator specified by the `name` parameter. ## Discussion You call the function [`CGPDFOperatorTableSetCallback(_:_:_:)`](/documentation/CoreGraphics/CGPDFOperatorTableSetCallback(_:_:_:)) for each PDF operator for which you want to provide a callback. See Appendix A in the *PDF Reference, Second Edition*, version 1.3, Adobe Systems Incorporated for a summary of PDF operators. --- 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)