Disable Scroll Bouncing in PDF using Swift for iOS

1
//
2
//  Copyright © 2019-2025 PSPDFKit GmbH. All rights reserved.
3
//
4
//  The Nutrient sample applications are licensed with a modified BSD license.
5
//  Please see License for details. This notice may not be removed from this file.
6
//
7

8
import PSPDFKit
9
import PSPDFKitUI
10

11
class DisableScrollBouncingExample: Example, PDFDocumentViewControllerDelegate {
12

13
    override init() {
14
        super.init()
15

16
        title = "Disable Scroll View Bouncing"
17
        contentDescription = "Disable bouncing for the document scroll view zoom and zoom view"
18
        category = .viewCustomization
19
    }
20

21
    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController {
22
        let document = AssetLoader.document(for: .welcome)
23
        let controller = PDFViewController(document: document)
24
        controller.documentViewController?.delegate = self
25
        return controller
26
    }
27

28
    // MARK: PDFViewControllerDelegate
29

30
    // Disables bouncing on the scroll view, even when fully zoomed out.
31
    // Noticeable when scrolling to the left on the first page, or when scrolling to the right on the last page.
32
    func documentViewController(_ documentViewController: PDFDocumentViewController, configureScrollView scrollView: UIScrollView) {
33
        scrollView.bounces = false
34
    }
35

36
    // Disables bouncing when scrolling while zoomed in.
37
    func documentViewController(_ documentViewController: PDFDocumentViewController, configureZoom zoomView: UIScrollView, forSpreadAt spreadIndex: Int) {
38
        zoomView.bounces = false
39
    }
40
}