Use a Custom Sharing View Made With SwiftUI

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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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import SwiftUI
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class SwiftUISharingExample: Example {
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    override init() {
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        super.init()
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        title = "SwiftUI with Customized Sharing Experience"
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        contentDescription = "Set custom delegates for presented view controllers on-the-fly"
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        category = .swiftUI
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        priority = 50
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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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        let swiftUIView = SwiftUIExampleView(document: document)
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        return UIHostingController(rootView: swiftUIView, largeTitleDisplayMode: .never)
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    }
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}
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/// Standalone delegate handler to customize the title
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class DocumentSharingHandler: StandaloneDelegate<PDFDocumentSharingViewControllerDelegate>, PDFDocumentSharingViewControllerDelegate {
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    func documentSharingViewController(_ shareController: PDFDocumentSharingViewController, filenameForGeneratedFileFor sharingDocument: Document, destination: DocumentSharingConfiguration.Destination) -> String? {
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        "NewName"
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    }
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}
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private struct SwiftUIExampleView: View {
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    let document: Document
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    @PDFView.Scope private var scope
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    var body: some View {
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        PDFView(document: document)
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            .onDidShowController { controller, _, _ in
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                guard let sharingController = controller as? PDFDocumentSharingViewController else { return }
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                // The StandaloneDelegateContainer will automatically manage the lifetime of this helper
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                // It will be deallocated as soon as sharingController is deallocated.
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                // We forward unimplemented callbacks to the default delegate handlers in `PDFViewController`.
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                let handler = DocumentSharingHandler(delegateTarget: sharingController,
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                                                     originalDelegate: sharingController.delegate)
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                // While the handler automatically manages lifetime, Swift 5.5 doesn't know that and creates a warning.
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                // The withExtendedLifetime helper prevents this warning.
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                withExtendedLifetime(handler) {
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                    sharingController.delegate = handler
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                }
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            }
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            .showDocumentTitle()
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            .toolbar {
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                DefaultToolbarButtons()
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            }
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            .pdfViewScope(scope)
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    }
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}