Initialize a PDF with Data 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 DocumentDataProviderPDFFromDataExample: Example {
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    override init() {
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        super.init()
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        title = "Initializing with Data"
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        contentDescription = "Initialize a PDF document with Data contents."
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        category = .documentDataProvider
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        priority = 20
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate?) -> UIViewController? {
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        let assetURL = AssetLoader.assetURL(for: .welcome)
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        guard let data = try? Data(contentsOf: assetURL, options: .mappedIfSafe) else {
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            print("Unable to access contents of \(assetURL.path)")
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            return nil
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        }
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        // Create `DataContainerProvider` using the Data at the URL.
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        // See https://www.nutrient.io/guides/ios/features/data-providers/ for more details.
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        let dataContainerProvider = DataContainerProvider(data: data)
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        // Use the above created data provider to create and load a document.
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        // This will be only an in-memory document. The changes made to the document will not be
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        // saved to disk. If you wish to be able to persist the changes to the original asset URL
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        // then please consider using the `FileDataProvider` instead.
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        // Also, see MultipleFilesExample.swift.
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        let document = Document(dataProviders: [dataContainerProvider])
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        // Display the document loaded using the contents at the URL.
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        let controller = PDFViewController(document: document)
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        controller.navigationItem.setRightBarButtonItems([controller.thumbnailsButtonItem, controller.outlineButtonItem, controller.searchButtonItem, controller.activityButtonItem], for: .document, animated: false)
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        return controller
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    }
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}