Simplifying the annotation inspector using 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 SimpleAnnotationInspectorExample: Example, PDFViewControllerDelegate {
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    override init() {
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        super.init()
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        title = "Simple Annotation Inspector"
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        contentDescription = "Shows how to hide certain properties from the annotation inspector."
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        category = .viewCustomization
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        priority = 30
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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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            // Overrides the inspector with our own subclass to dynamically modify what properties we want to show.
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            $0.overrideClass(AnnotationStyleViewController.self, with: SimpleAnnotationStyleViewController.self)
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        }
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        //  We use the delegate to customize the menu items.
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        pdfController.delegate = self
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        return pdfController
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    }
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}
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private class SimpleAnnotationStyleViewController: AnnotationStyleViewController {
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    override func properties(for annotations: [Annotation]) -> [[AnnotationStyle.Key]] {
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        // Allow only a smaller list of known properties in the inspector.
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        let supportedKeys: [AnnotationStyle.Key] = [.color, .alpha, .lineWidth, .fontSize]
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        return super.properties(for: annotations).map {
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            $0.filter { supportedKeys.contains($0) }
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        }
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    }
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}