Create an Always-Dark Annotation Toolbar in Swift for iOS

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//
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//  Copyright © 2019-2025 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 AlwaysDarkAnnotationToolbarExample: Example {
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    override init() {
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        super.init()
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        title = "Dark Annotation Toolbar"
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        contentDescription = "Customize Annotation Toolbar to always use Dark Mode UI"
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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.writableDocument(for: .welcome, overrideIfExists: false)
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        let pdfController = PDFViewController(document: document)
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        let annotationToolbar = pdfController.annotationToolbarController?.annotationToolbar
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        // Set the user interface style of the annotation toolbar to dark
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        // to always use the dark mode appearance.
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        annotationToolbar?.overrideUserInterfaceStyle = .dark
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        return pdfController
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    }
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}