iOS PDFkit cannot add custom attribute to pdf document
问题 I am trying to add custom attribute to a pdf document metadata, but after savedocument(document) the custom attribute is not added to the document. @IBOutlet weak var pdfContainerView: PDFView! private func setDocumentAttributes(){ if let document = pdfContainerView.document{ var attributes = document.documentAttributes attributes!["NewAttribute"] = "Test" document.documentAttributes = attributes savedocument(document) } } 来源: https://stackoverflow.com/questions/54986089/ios-pdfkit-cannot-add