Custom saving options after editing PDF in Swift for iOS

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//
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//  Copyright © 2019-2026 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 DocumentEditorCustomSavingConfirmationExample: Example {
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    override init() {
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        super.init()
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        title = "Customize the Saving Confirmation Alert on the Document Editor"
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        contentDescription = "Provide custom options for saving a document after editing it."
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        category = .viewCustomization
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        priority = 3
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController {
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        // Let's create a new writable document every time we invoke the example.
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        let document = AssetLoader.writableDocument(for: .welcome, overrideIfExists: true)
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        let configuration = PDFConfiguration {
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            $0.overrideClass(PDFDocumentEditorToolbarController.self, with: CustomEditorToolbarController.self)
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        }
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        return PDFViewController(document: document, configuration: configuration)
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    }
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    // MARK: Controller
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    @MainActor class CustomEditorToolbarController: PDFDocumentEditorToolbarController {
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        override func savingConfirmationControllerForSender(_ sender: Any?, completionHandler: ((Bool) -> Void)? = nil) -> UIViewController {
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            let newAlert = UIAlertController(title: "Save", message: "Are you sure you want to save?", preferredStyle: .actionSheet)
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            newAlert.addAction(UIAlertAction(title: "Save As...", style: .default, handler: { [weak self] _ in
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                self?.toggleSave(sender, presentationOptions: nil, completionHandler: completionHandler)
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            }))
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            newAlert.addAction(UIAlertAction(title: "Discard Changes", style: .destructive, handler: { [weak self] _ in
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                self?.documentEditor?.reset()
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                completionHandler?(false)
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            }))
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            newAlert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { _ in
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                completionHandler?(true)
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            }))
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            return newAlert
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        }
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    }
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}