fileIdentifier
Gets the file identifier for a PDF document.
Declaration
var fileIdentifier: CGPDFArrayRef? { get }Discussion
A PDF file identifier is defined in the PDF specification as an array of two strings, the first of which is a permanent identifier that doesn’t change even when the file is updated. The second string changes each time the file is updated. For more information, see PDF Reference: Version 1.3 (Second Edition), Adobe Systems Incorporated.