Customize thumbnail page labels

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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 CustomThumbnailPageLabelExample: Example {
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    override init() {
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        super.init()
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        contentDescription = "Shows how to customize page labels in the thumbnails view mode."
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        category = .controllerCustomization
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        priority = 10
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController? {
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        // Set custom appearance only to the custom subclass so that we don't
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        // override all examples here. In your code, you can use ThumbnailGridViewCell.
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        let appearance = RoundedLabel.appearance(whenContainedInInstancesOf: [CustomThumbnailGridViewCell.self])
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        appearance.rectColor = UIColor.systemGreen.withAlphaComponent(0.8)
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        appearance.cornerRadius = 20
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        // Register our custom cell as a subclass.
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        let controller = PDFViewController(document: AssetLoader.document(for: .welcome)) {
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            $0.overrideClass(ThumbnailGridViewCell.self, with: CustomThumbnailGridViewCell.self)
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        }
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        // Switch to the thumbnails mode immediately.
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        controller.viewMode = .thumbnails
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        return controller
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    }
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}
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private class CustomThumbnailGridViewCell: ThumbnailGridViewCell {
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    override func updatePageLabel() {
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        super.updatePageLabel()
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        // You can customize the page label here as well.
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        if let fontDescriptor = UIFontDescriptor.preferredFontDescriptor(withTextStyle: .body).withDesign(.monospaced) {
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            self.pageLabel.font = UIFont(descriptor: fontDescriptor, size: 0)
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        }
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    }
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}