Use PDFViewController with SwiftUI for iOS

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//
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//  Copyright © 2019-2025 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 SwiftUIExample: Example {
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    override init() {
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        super.init()
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        title = "SwiftUI Example"
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        contentDescription = "Shows how to show a PDFViewController in SwiftUI."
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        category = .swiftUI
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        priority = 10
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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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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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            .scrollDirection(.vertical)
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            .pageTransition(.scrollContinuous)
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            .pageMode(.single)
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            .spreadFitting(.adaptive)
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            // Enable displaying the document title.
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            .showDocumentTitle()
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            // Add PDFView buttons to the toolbar.
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            .toolbar {
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                ReaderViewButton()
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                AnnotationButton()
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                ThumbnailsButton()
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            }
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            .pdfViewScope(scope)
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    }
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}
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// MARK: Previews
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struct SwiftUIExamplePreviews: PreviewProvider {
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    static var previews: some View {
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        let document = AssetLoader.document(for: .welcome)
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        SwiftUIExampleView(document: document)
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    }
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}