Customize PDF sharing options in Swift for iOS

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//
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//  Copyright © 2018-2026 PSPDFKit GmbH. All rights reserved.
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//
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//  The Nutrient sample applications are licensed with a modified BSD license.
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//  Please see License for details. This notice may not be removed from this file.
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//
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import PSPDFKit
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import PSPDFKitUI
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class CustomSharingOptionsExample: Example {
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    var pdfController: PDFViewController!
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    var document: Document!
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    var otherDocument: Document!
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    override init() {
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        super.init()
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        contentDescription = "Customizes the sharing options for documents in different ways."
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        category = .sharing
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        priority = 900
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController {
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        document = AssetLoader.document(for: .welcome)
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        otherDocument = AssetLoader.document(for: .annualReport)
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        pdfController = PDFViewController(document: document)
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        let shareButton = UIBarButtonItem(image: SDK.imageNamed("share"), style: .done, target: self, action: #selector(shareButtonTapped(sender:)))
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        /// This button works similarly to that of exporting multiple documents,
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        /// but the PDFDocumentSharingViewController delegate implemented below is called.
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        /// In the delegate callback below, you can also access the files about to be exported.
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        let onlyExportButton = UIBarButtonItem(title: "Only Export the Files", style: .done, target: self, action: #selector(CustomSharingOptionsExample.onlyExportFiles(sender:)))
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        pdfController.navigationItem.rightBarButtonItems = [shareButton, onlyExportButton]
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        return pdfController
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    }
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    @objc
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    fileprivate func shareButtonTapped(sender: UIBarButtonItem) {
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        let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
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        alertController.popoverPresentationController?.sourceItem = sender
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        // Add Email option if available
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        if MFMailComposeViewController.canSendMail() {
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            let emailAction = UIAlertAction(title: "Email", style: .default) { _ in
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                self.emailTapped(sender: sender)
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            }
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            alertController.addAction(emailAction)
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        }
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        // Add Export option
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        let exportAction = UIAlertAction(title: "Export", style: .default) { _ in
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            self.exportTapped(sender: sender)
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        }
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        alertController.addAction(exportAction)
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        // Add Multiple Documents option
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        let multipleDocumentsAction = UIAlertAction(title: "Multiple Documents", style: .default) { _ in
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            self.exportMultipleDocuments(sender: sender)
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        }
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        alertController.addAction(multipleDocumentsAction)
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        // Cancel
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        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel)
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        alertController.addAction(cancelAction)
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        // Present the alert
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        pdfController.present(alertController, animated: true)
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    }
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    @objc
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    fileprivate func emailTapped(sender: Any) {
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        let sharingConfiguration = DocumentSharingConfiguration {
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            $0.destination = .email
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            $0.annotationOptions.remove(.embed)
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        }
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        let shareController = PDFDocumentSharingViewController(documents: [document], sharingConfigurations: [sharingConfiguration])
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        shareController.present(from: pdfController, sender: sender)
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    }
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    @objc
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    fileprivate func exportTapped(sender: Any) {
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        let sharingConfiguration = DocumentSharingConfiguration {
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            $0.destination = .export
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            $0.annotationOptions = [.flatten]
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        }
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        let shareController = PDFDocumentSharingViewController(documents: [document], sharingConfigurations: [sharingConfiguration])
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        shareController.present(from: pdfController, sender: sender)
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    }
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    @objc
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    fileprivate func exportMultipleDocuments(sender: Any) {
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        let shareController = PDFDocumentSharingViewController(documents: [document, otherDocument])
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        shareController.present(from: pdfController, sender: sender)
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    }
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    @objc
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    fileprivate func onlyExportFiles(sender: Any) {
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        let shareController = PDFDocumentSharingViewController(documents: [document, otherDocument])
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        shareController.delegate = self
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        shareController.present(from: pdfController, sender: sender)
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    }
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}
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extension CustomSharingOptionsExample: PDFDocumentSharingViewControllerDelegate {
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    internal func documentSharingViewController(_ shareController: PDFDocumentSharingViewController, shouldShare files: [File], toDestination destination: DocumentSharingConfiguration.Destination) -> Bool {
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        pdfController.dismiss(animated: true, completion: nil)
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        // Retrieve the files and copy them to a safe location
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        return false
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    }
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}