Update configuration when rotating PDF in Swift for iOS

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//
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//  Copyright © 2018-2026 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 UpdateConfigurationWhenRotatingExample: Example {
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    private weak var pdfController: PDFViewController?
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    override init() {
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        super.init()
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        title = "Changing Configuration when Rotating Device"
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        contentDescription = "Illustrates how to update the configuration when rotating the device"
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        category = .controllerCustomization
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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: .annualReport)
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        let pdfController = PDFViewController(document: document) {
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            $0.isFirstPageAlwaysSingle = false
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            $0.pageMode = .single
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        }
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        pdfController.setUpdateSettingsForBoundsChange { [weak self] _ in
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            self?.updateConfigurationOnRotation()
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        }
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        self.pdfController = pdfController
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        return pdfController
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    }
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    func updateConfigurationOnRotation() {
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        let pdfController = self.pdfController
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        pdfController?.updateConfiguration {
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            if pdfController?.configuration.pageMode == .single {
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                $0.pageMode = .double
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                $0.pageTransition = .scrollPerSpread
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            } else if pdfController?.configuration.pageMode == .double {
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                $0.pageMode = .single
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                $0.pageTransition = .scrollContinuous
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            }
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        }
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    }
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}