Disable PDF annotation editing in Swift for iOS

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//
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//  Copyright © 2017-2026 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 LockAnnotationsExample: Example {
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    override init() {
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        super.init()
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        title = "Generate a new file with locked annotations"
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        contentDescription = "Uses the annotation flags to create a locked copy."
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        category = .annotations
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        priority = 1000
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController {
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        let samplesURL = Bundle.main.resourceURL!.appendingPathComponent("Samples")
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        let documentURL = samplesURL.appendingPathComponent(AssetName.annualReport.rawValue)
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        let writableDocumentURL = documentURL.copyToDocumentDirectory()
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        // Copy the document to the temp directory.
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        let tempURL = FileHelper.temporaryPDFFileURL(prefix: "locked_\(writableDocumentURL.lastPathComponent)")
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        if FileManager.default.fileExists(atPath: writableDocumentURL.path) {
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            try? FileManager.default.copyItem(at: writableDocumentURL, to: tempURL)
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        } else {
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            try? FileManager.default.copyItem(at: documentURL, to: tempURL)
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        }
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        // Open the new file and modify the annotations to be locked.
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        let document = Document(url: tempURL)
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        document.annotationSaveMode = .embedded
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        // Create at least one annotation if the document is currently empty.
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        let allTypesButLinks = Annotation.Kind.all.subtracting(.link)
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        let allAnnotations = document.annotationsForPage(at: 0, type: allTypesButLinks)
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        if allAnnotations.isEmpty {
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            let ink = InkAnnotation.sampleInkAnnotation(in: CGRect(x: 100.0, y: 100.0, width: 200.0, height: 200.0))
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            ink.color = UIColor(red: 0.667, green: 0.279, blue: 0.748, alpha: 1.0)
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            ink.pageIndex = 0
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            document.add(annotations: [ink])
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        }
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        // Lock all annotations except links and forms/widgets.
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        let allTypesButLinkAndForms = Annotation.Kind.all.subtracting([.link, .widget])
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        for pageIndex in 0..<document.pageCount {
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            let annotations = document.annotationsForPage(at: pageIndex, type: allTypesButLinkAndForms)
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            for annotation in annotations {
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                // Preserve existing flags, just set the locked and locked contents flags.
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                annotation.flags.update(with: [.locked, .lockedContents])
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            }
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        }
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        // Save the document.
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        try? document.save()
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        print("Locked file: \(tempURL.path)")
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        let controller = PDFViewController(document: document)
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        return controller
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    }
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}