Add file annotation to PDF 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 AddFileAnnotationWithEmbeddedFileExample: Example, PDFViewControllerDelegate, PDFDocumentPickerControllerDelegate {
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    var pdfController: PDFViewController?
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    var documentPickerController: PDFDocumentPickerController?
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    var longPressedPoint: CGPoint?
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    override init() {
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        super.init()
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        title = "Add and remove file annotations with embedded files from a custom menu item"
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        contentDescription = "Adds new menu items that will create and delete file annotations at the selected position."
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        category = .annotations
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        priority = 65
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController {
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        let document = AssetLoader.writableDocument(for: .welcome, overrideIfExists: false)
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        documentPickerController = PDFDocumentPickerController(directory: "/Bundle/Samples", includeSubdirectories: true, library: SDK.shared.library)
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        documentPickerController?.delegate = self
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        pdfController = PDFViewController(document: document)
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        pdfController?.delegate = self
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        return pdfController!
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    }
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    // MARK: - PDFViewControllerDelegate
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    func pdfViewController(_ sender: PDFViewController, menuForCreatingAnnotationAt point: CGPoint, onPageView pageView: PDFPageView, appearance: EditMenuAppearance, suggestedMenu: UIMenu) -> UIMenu {
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        let attachFileAction = UIAction(title: "Attach File", image: UIImage(systemName: "paperclip")) { [self] _ in
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            // Store the long pressed point in PDF coordinates to be used to set the bounding box of the newly created file annotation.
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            longPressedPoint = pageView.pdfCoordinateSpace.convert(point, from: pageView)
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            // Present the document picker.
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            sender.present(self.documentPickerController!, options: [.closeButton: true], animated: true, sender: nil)
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        }
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        // Prepend our custom action.
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        return suggestedMenu
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            .prepend([attachFileAction])
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    }
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    // MARK: - PDFDocumentPickerControllerDelegate
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    func documentPickerController(_ controller: PDFDocumentPickerController, didSelect document: Document, pageIndex: PageIndex, search searchString: String?) {
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        let fileURL = document.fileURL
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        let fileDescription = document.fileURL?.lastPathComponent
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        // Create the file annotation and its embedded file
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        let fileAnnotation = FileAnnotation()
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        fileAnnotation.pageIndex = pageIndex
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        fileAnnotation.boundingBox = CGRect(x: (self.longPressedPoint?.x)!, y: (self.longPressedPoint?.y)!, width: 32, height: 32)
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        let embeddedFile = EmbeddedFile(fileURL: fileURL!, fileDescription: fileDescription)
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        fileAnnotation.embeddedFile = embeddedFile
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        // Add the embedded file to the document.
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        pdfController?.document?.add(annotations: [fileAnnotation])
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        // Dismiss the document picker.
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        controller.dismiss(animated: true, completion: nil)
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    }
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}