Customize the PDF search highlight color in Swift for iOS

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//
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//  Copyright © 2021-2026 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 SearchHighlightColorExample: Example {
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    override init() {
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        super.init()
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            title = "Custom Inline Search Highlight Color"
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            contentDescription = "Changes the search highlight color for inline search to blue via UIAppearance."
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            category = .viewCustomization
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            priority = 50
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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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        // We use a custom subclass of the PDFViewController to avoid polluting other examples, since UIAppearance can't be reset to the default.
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        SearchHighlightView.appearance(whenContainedInInstancesOf: [CustomColoredSearchHighlightPDFViewController.self]).selectionBackgroundColor = UIColor.blue.withAlphaComponent(0.5)
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        let pdfController = CustomColoredSearchHighlightPDFViewController(document: document) {
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            $0.searchMode = .inline
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        }
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        // Automatically start search.
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        DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
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            pdfController.search(for: "Nutrient", options: nil, sender: nil, animated: true)
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        }
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        return pdfController
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    }
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}
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// Custom empty subclass of the PDFViewController to avoid polluting other examples, since UIAppearance can't be reset to the default.
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private class CustomColoredSearchHighlightPDFViewController: PDFViewController {
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}
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class ModalSearchHighlightColorExample: Example {
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    override init() {
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        super.init()
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        title = "Custom Modal Search Highlight Color"
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        contentDescription = "Changes the search highlight color to red in SearchViewController."
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        category = .viewCustomization
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        priority = 49
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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(SearchViewController.self, with: CustomHighlightSearchViewController.self)
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        }
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        // Automatically start search.
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        DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
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            pdfController.search(for: "Nutrient", options: nil, sender: nil, animated: true)
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        }
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        return pdfController
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    }
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}
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private class CustomHighlightSearchViewController: SearchViewController {
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    override init(document: Document?) {
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        super.init(document: document)
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        highlightColor = .red
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    }
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}