Toggle PDF form field highlight color 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 FormHighlightExample: Example {
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    private weak var pdfController: PDFViewController?
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    override init() {
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        super.init()
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        title = "Custom Form Highlight Color"
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        contentDescription = "Shows how to toggle the form highlight color."
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        category = .viewCustomization
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController {
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        let document = AssetLoader.document(for: "Form.pdf")
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        // Start by not highlighting forms.
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        document.updateRenderOptions(for: .all) {
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            $0.interactiveFormFillColor = .clear
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        }
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        let image = SDK.imageNamed("highlight.png")!
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        let toggleButton = UIBarButtonItem(image: image, style: .plain, target: self, action: #selector(toggleHighlight))
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        let pdfController = PDFViewController(document: document)
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        pdfController.navigationItem.rightBarButtonItems = [toggleButton]
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        self.pdfController = pdfController
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        return pdfController
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    }
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    // MARK: Actions
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    @objc func toggleHighlight() {
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        guard let pdfController = self.pdfController, let document = pdfController.document else {
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            return
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        }
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        // Toggle between highlighted forms and clear forms.
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        let currentColor = document.renderOptions(forType: .all).interactiveFormFillColor
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        let highlightColor = UIColor.catalogAccent.withAlphaComponent(0.2)
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        document.updateRenderOptions(for: .page) { options in
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            options.interactiveFormFillColor = currentColor == .clear ? highlightColor : .clear
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        }
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        pdfController.reloadData()
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    }
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}