Present a confirmation sheet for iOS annotations

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//
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//  Copyright © 2021-2025 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 ConfirmAnnotationDeletionExample: Example, PDFViewControllerDelegate {
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    override init() {
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        super.init()
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        title = "Confirm Annotation Deletion"
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        contentDescription = "Shows how to present a confirmation sheet before deleting annotations."
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        category = .viewCustomization
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController? {
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        PDFViewController(document: AssetLoader.document(for: .annualReport), delegate: self)
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    }
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    func pdfViewController(_ sender: PDFViewController, menuForAnnotations annotations: [Annotation], onPageView pageView: PDFPageView, appearance: EditMenuAppearance, suggestedMenu: UIMenu) -> UIMenu {
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        // Create a custom Delete action that presents a confirmation alert.
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        let deleteAction = UIAction(title: "Delete", image: UIImage(systemName: "trash"), attributes: [.destructive]) { _ in
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            let alert = UIAlertController(
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                // A custom localization dictionary must be used for correct
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                // localization. Some languages have more forms of pluralization
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                // than English.
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                title: annotations.count == 1 ? "Delete annotation?" : "Delete \(annotations.count) annotations?",
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                message: nil,
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                preferredStyle: .alert
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            )
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            alert.addAction(.init(
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                title: "Cancel",
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                style: .cancel
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            ))
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            alert.addAction(.init(
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                title: "Delete",
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                style: .destructive,
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                handler: { _ in
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                    sender.document?.remove(annotations: annotations)
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                }
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            ))
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            sender.present(alert, animated: true)
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        }
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        // Replace the Delete action with our own.
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        return suggestedMenu
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            .replace(action: .PSPDFKit.delete, with: deleteAction)
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    }
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}