Customize PDF page lables in Swift for iOS

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//
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//  Copyright © 2017-2026 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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private class CustomPageLabelFormatter: PageLabelFormatter {
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    override func string(from pageRange: NSRange) -> String {
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        return "Custom Page Label: \(pageRange.location + 1)"
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    }
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}
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class CustomPageLabelExample: Example {
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    override init() {
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        super.init()
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        title = "Custom Page Label Example"
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        contentDescription = "Shows how to customize page labels."
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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: .annualReport)
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        let controller = PDFViewController(document: document) {
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            $0.pageMode = .single
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        }
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        // Set the custom label formatter
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        controller.userInterfaceView.pageLabel.labelFormatter = CustomPageLabelFormatter()
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        return controller
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    }
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}