Create Password Protected PDF in Swift for iOS

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//
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//  Copyright © 2017-2025 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 CreatePasswordProtectedDocumentExample: Example {
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    override init() {
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        super.init()
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        title = "Create password protected PDF"
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        contentDescription = "Password is 'test123'"
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        category = .security
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController? {
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        let password = "test123"
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        let tempURL = FileHelper.temporaryPDFFileURL(prefix: "protected")
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        let hackerMagDoc = AssetLoader.document(for: .annualReport)
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        let status = StatusHUDItem.progress(withText: PSPDFKit.localizedString("Preparing") + ("…"))
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        status.push(animated: true, on: delegate.currentViewController?.view.window)
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        // By default, a newly initialized `PSPDFProcessorConfiguration` results in an exported Document that is the same as the input.
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        let processorConfiguration = Processor.Configuration(document: hackerMagDoc)
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        // Set the proper password and key length in the `Document.SecurityOptions`
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        let documentSecurityOptions = try? Document.SecurityOptions(ownerPassword: password, userPassword: password, keyLength: Document.SecurityOptionsKeyLengthAutomatic)
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        DispatchQueue.global(qos: .default).async(execute: {() -> Void in
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            do {
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                // Process annotations.
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                // `PSPDFProcessor` doesn't modify the document, but creates an output file instead.
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                let processor = Processor(configuration: processorConfiguration!, securityOptions: documentSecurityOptions)
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                processor.delegate = self
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                try processor.write(toFileURL: tempURL)
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            } catch {
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                print("Error while processing document: \(error)")
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                return
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            }
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            DispatchQueue.main.async(execute: {() -> Void in
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                status.pop(animated: true)
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                // show file
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                let document = Document(url: tempURL)
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                let pdfController = PDFViewController(document: document)
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                delegate.currentViewController?.navigationController?.pushViewController(pdfController, animated: true)
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            })
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        })
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        return nil
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    }
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}
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extension CreatePasswordProtectedDocumentExample: ProcessorDelegate {
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    func processor(_ processor: Processor, didProcessPage currentPage: UInt, totalPages: UInt) {
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        print("Progress: \(currentPage + 1) of \(totalPages)")
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    }
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}