Customize Thumbnail Page Labels
Customize page labels in the thumbnails view mode.
//// Copyright © 2021-2025 PSPDFKit GmbH. All rights reserved.//// The Nutrient sample applications are licensed with a modified BSD license.// Please see License for details. This notice may not be removed from this file.//
import PSPDFKitimport PSPDFKitUI
class CustomThumbnailPageLabelExample: Example {
override init() { super.init() title = "Custom Thumbnail Page Label" contentDescription = "Shows how to customize page labels in the thumbnails view mode." category = .controllerCustomization priority = 10 }
override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController? { // Set custom appearance only to the custom subclass so that we don't // overrde all examples here. In your code, you can use ThumbnailGridViewCell. let appearance = RoundedLabel.appearance(whenContainedInInstancesOf: [CustomThumbnailGridViewCell.self]) appearance.rectColor = UIColor.systemGreen.withAlphaComponent(0.8) appearance.cornerRadius = 20 // Register our custom cell as a subclass. let controller = PDFViewController(document: AssetLoader.document(for: .welcome)) { $0.overrideClass(ThumbnailGridViewCell.self, with: CustomThumbnailGridViewCell.self) } // Switch to the thumbnails mode immediately. controller.viewMode = .thumbnails return controller }
}
private class CustomThumbnailGridViewCell: ThumbnailGridViewCell {
override func updatePageLabel() { super.updatePageLabel() // You can customize the page label here as well. }
}
This code sample is an example that illustrates how to use our SDK. Please adapt it to your specific use case.