Create PDF Bookrmark with UI in Swift for iOS

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//
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//  Copyright © 2018-2025 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 BookmarkUIExample: Example {
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    override init() {
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        super.init()
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        title = "Custom Bookmark Name UI"
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        contentDescription = "Shows a UI window where you can name your bookmarks while creating them."
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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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        let document = AssetLoader.writableDocument(for: .welcome, overrideIfExists: false)
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        let pdfController = CustomBookmarkPDFViewController(document: document)
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        return pdfController
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    }
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}
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// MARK: Controller
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private class CustomBookmarkPDFViewController: PDFViewController {
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    // MARK: Lifecycle
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    public override func commonInit(with document: Document?, configuration: PDFConfiguration) {
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        super.commonInit(with: document, configuration: configuration)
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        bookmarkButtonItem.action = #selector(bookmarkButtonTapped)
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        navigationItem.rightBarButtonItems = [thumbnailsButtonItem, activityButtonItem, outlineButtonItem, bookmarkButtonItem]
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    }
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    // MARK: - Actions
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    @objc func bookmarkButtonTapped() {
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        guard let bookmarkManager = document?.bookmarkManager else {
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            print("Couldn't get bookmark manager.")
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            return
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        }
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        // We need to properly handle adding and removing bookmarks
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        if bookmarkManager.bookmarkForPage(at: pageIndex) == nil {
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            let alert = UIAlertController(title: nil, message: "Please name your bookmark:", preferredStyle: .alert)
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            // We need a mutable copy since we can't edit the name of the bookmark otherwise
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            let mutableBookmark = MutableBookmark(pageIndex: pageIndex)
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            alert.addTextField { textField in
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                // This will be the dault name of the bookmark if not name is entered into the text field
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                textField.placeholder = "Page \(self.pageIndex + 1)"
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            }
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            let okAction = UIAlertAction(title: "OK", style: .default) { _ in
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                // We us the content of the textfield as the name of the bookmark
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                mutableBookmark.name = alert.textFields![0].text
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                bookmarkManager.addBookmark(mutableBookmark)
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            }
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            let cancelAction = UIAlertAction(title: "Cancel", style: .destructive)
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            alert.addAction(cancelAction)
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            alert.addAction(okAction)
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            present(alert, animated: true)
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        } else {
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            bookmarkManager.removeBookmarksForPage(at: pageIndex)
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        }
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    }
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}