Embed PSPDFKit as a Child View Controller in Swift for iOS

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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 ChildViewControllerUsingParentNavigationBarExample: Example {
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    override init() {
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        super.init()
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        title = "View Controller Containment, Using Parent Navigation Bar"
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        contentDescription = "Shows how to embed a PDFViewController as a child view controller and let it use its parent's navigation bar."
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        category = .controllerCustomization
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        priority = 33
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController? {
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        ParentViewController(document: AssetLoader.document(for: .annualReport))
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    }
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}
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private class ParentViewController: UIViewController {
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    init(document: Document?) {
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        self.document = document
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        super.init(nibName: nil, bundle: nil)
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    }
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    required init?(coder: NSCoder) {
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        fatalError("init(coder:) has not been implemented")
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    }
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    var document: Document? {
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        didSet {
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            guard oldValue !== document else { return }
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            pdfViewController.document = document
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        }
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    }
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    private lazy var pdfViewController = PDFViewController(document: document) { builder in
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        builder.useParentNavigationBar = true
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    }
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    override func viewDidLoad() {
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        super.viewDidLoad()
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        // Disable the large title because it looks weird.
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        navigationItem.largeTitleDisplayMode = .never
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        // Set up the view hierarhcy.
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        addChild(pdfViewController)
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        view.addSubview(pdfViewController.view)
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        pdfViewController.didMove(toParent: self)
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        // Lay out the views using Auto Layout.
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        pdfViewController.view.translatesAutoresizingMaskIntoConstraints = false
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        NSLayoutConstraint.activate([
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            pdfViewController.view.topAnchor.constraint(equalTo: view.topAnchor),
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            pdfViewController.view.leftAnchor.constraint(equalTo: view.leftAnchor),
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            pdfViewController.view.rightAnchor.constraint(equalTo: view.rightAnchor),
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            pdfViewController.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
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        ])
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    }
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}