Insert page into PDF from another document in Swift for iOS

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//
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//  Copyright © 2016-2026 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 NewPageFromDocumentExample: Example {
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    override init() {
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        super.init()
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        title = "Copy Page From Another Document"
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        contentDescription = "Use PSPDFDocumentEditor to copy a page from another document."
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        category = .documentEditing
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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 pdfController = EditingPDFController(document: document)
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        // Add a single button that triggers preset document editing actions.
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        let editButtonItem = UIBarButtonItem(image: SDK.imageNamed("document_editor"), style: .plain, target: pdfController, action: #selector(EditingPDFController.edit))
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        pdfController.navigationItem.rightBarButtonItems = [editButtonItem]
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        return pdfController
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    }
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    // MARK: Controller
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    class EditingPDFController: PDFViewController {
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        // MARK: Actions
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        @objc func edit(_ sender: AnyObject) {
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            guard let document else { return }
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            guard let editor = PDFDocumentEditor(document: document) else { return }
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            let anotherDocument = AssetLoader.document(for: "Placeholder A.pdf")
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            // Copy page from another document
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            let template = PageTemplate(document: anotherDocument, sourcePageIndex: 0)
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            let newPageConfiguration = PDFNewPageConfiguration(pageTemplate: template, builderBlock: nil)
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            editor.addPages(in: NSRange(location: 0, length: 1), with: newPageConfiguration)
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            // Save and overwrite the document.
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            editor.save { _, error in
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                if let error {
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                    print("Document editing failed: \(error)")
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                    return
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                }
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                // Access the UI on the main thread.
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                DispatchQueue.main.async {
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                    self.pdfController.reloadData()
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                }
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            }
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        }
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    }
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}