Disable scroll bouncing in PDF using Swift for iOS

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//
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//  Copyright © 2019-2026 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 DisableScrollBouncingExample: Example, PDFDocumentViewControllerDelegate {
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    override init() {
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        super.init()
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        title = "Disable Scroll View Bouncing"
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        contentDescription = "Disable bouncing for the document scroll view zoom and zoom view"
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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: .welcome)
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        let controller = PDFViewController(document: document)
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        controller.documentViewController?.delegate = self
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        return controller
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    }
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    // MARK: PDFViewControllerDelegate
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    // Disables bouncing on the scroll view, even when fully zoomed out.
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    // Noticeable when scrolling to the left on the first page, or when scrolling to the right on the last page.
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    func documentViewController(_ documentViewController: PDFDocumentViewController, configureScrollView scrollView: UIScrollView) {
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        scrollView.bounces = false
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    }
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    // Disables bouncing when scrolling while zoomed in.
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    func documentViewController(_ documentViewController: PDFDocumentViewController, configureZoom zoomView: UIScrollView, forSpreadAt spreadIndex: Int) {
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        zoomView.bounces = false
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    }
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}