Customize Annotation Link Protocol in Swift for iOS

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//
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//  Copyright © 2017-2025 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 CustomLinkProtocolExample: Example {
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    override init() {
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        super.init()
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        title = "Custom Link Protocol"
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        contentDescription = "Uses a custom pspdfcatalog:// link protocol."
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        category = .annotations
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        priority = 800
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController? {
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        let document = AssetLoader.temporaryDocument(with: "Test PDF for custom Protocols")
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        document.annotationSaveMode = .disabled
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        // Add link
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        // By default, Nutrient would ask if you want to leave the app when an external URL is detected.
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        // We skip this question if the protocol is defined within our own app.
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        let link = PSPDFLinkAnnotation(url: URL(string: "pspdfcatalog://this-is-a-test-link")!)
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        let pageSize = document.pageInfoForPage(at: 0)!.size
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        let size = CGSize(width: 400, height: 300)
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        link.boundingBox = CGRect(x: (pageSize.width - size.width) / 2, y: (pageSize.height - size.height) / 2, width: size.width, height: size.height)
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        document.add([link])
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        let pdfController = PDFViewController(document: document)
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        return pdfController
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    }
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}