Convert HTML to PDF using 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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//  MIT License (MIT) for Simple HTML invoice template: https://github.com/sparksuite/simple-html-invoice-template/blob/master/LICENSE
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#if !targetEnvironment(macCatalyst)
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class ConvertHTMLToPDFExample: Example {
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    override init() {
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        super.init()
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        title = "Convert HTML to PDF"
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        contentDescription = "Convert a URL or simple HTML to PDF."
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        category = .documentGeneration
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        priority = 10
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController? {
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        let htmlFileURL = AssetLoader.assetURL(for: "Invoice.html")
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        let htmlString = try! String(contentsOf: htmlFileURL, encoding: .utf8)
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        let outputURL = FileHelper.temporaryPDFFileURL(prefix: "converted")
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        // start the conversion
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        let status = StatusHUDItem.indeterminateProgress(withText: "Converting...")
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        status.setHUDStyle(.black)
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        status.push(animated: true, on: delegate.currentViewController?.view.window, completion: nil)
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        let options = [PSPDFProcessorNumberOfPagesKey: 1, PSPDFProcessorDocumentTitleKey: "Generated PDF"] as [String: Any]
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        // You can also generate a PDF directly from a website URL.
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        // Use the `Processor.generatePDF(from:outputFileURL:options:completionBlock:)` API instead of the below used API.
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        // The only difference is that the above mentioned API takes a URL instance as a source
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        // while the other takes a HTML string.
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        // Uncomment and comment the below lines to see it in action.
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        // Processor.generatePDF(from: URL(string: "https://www.nutrient.io/")!, outputFileURL: outputURL, options: options) { actualOutputURL, error in
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        Processor.generatePDF(fromHTMLString: htmlString, outputFileURL: outputURL, options: options) { actualOutputURL, error in
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            if let error {
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                // Update status to error.
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                let statusError = StatusHUDItem.error(withText: error.localizedDescription)
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                statusError.pushAndPop(withDelay: 2, animated: true, on: delegate.currentViewController?.view.window)
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                status.pop(animated: true)
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            } else if let actualOutputURL {
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                // Update status to done.
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                let statusDone = StatusHUDItem.success(withText: "Done")
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                statusDone.pushAndPop(withDelay: 2, animated: true, on: delegate.currentViewController?.view.window)
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                status.pop(animated: true)
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                // Generate document and show it.
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                let document = Document(url: actualOutputURL)
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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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#endif