Create Email Snippet when Sharing PDF 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 PredefinedEmailBodyExample: Example {
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    override init() {
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        super.init()
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        title = "Custom Email Message Body"
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        contentDescription = "Shows how to set a predefined message body when sending an email."
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        category = .sharing
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        priority = 900
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        if MFMailComposeViewController.canSendMail() == false {
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            targetDevice = []
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        }
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController {
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        let document = AssetLoader.document(for: .welcome)
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        let pdfController = PDFViewController(document: document) {
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            $0.overrideClass(PDFDocumentSharingViewController.self, with: SharingViewController.self)
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        }
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        pdfController.navigationItem.rightBarButtonItems = [pdfController.emailButtonItem]
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        return pdfController
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    }
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}
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private class SharingViewController: PDFDocumentSharingViewController {
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    override func configureMailComposeViewController(_ mailComposeViewController: MFMailComposeViewController?) {
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        mailComposeViewController?.setMessageBody("<h1 style='color:blue'>Custom message body.</h1>", isHTML: true)
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    }
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}