Creating effective link annotations on 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 CustomAnnotationsWithMultipleFilesExample: Example {
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    override init() {
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        super.init()
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        title = "Custom annotations with multiple files"
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        category = .annotations
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        priority = 400
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController? {
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        let dataProviders = ["Placeholder A", "Placeholder B", "Placeholder C", "Placeholder D"].map {
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            CoordinatedFileDataProvider(fileURL: Bundle.main.url(forResource: $0, withExtension: "pdf", subdirectory: "Samples")!)
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        }
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        let document = Document(dataProviders: dataProviders)
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        let aVideo = LinkAnnotation(url: (URL(string: "pspdfkit://localhost/Bundle/big_buck_bunny.mp4"))!)
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        aVideo.boundingBox = CGRect(origin: .zero, size: document.pageInfoForPage(at: 5)!.size)
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        aVideo.pageIndex = 5
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        document.add(annotations: [aVideo])
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        let anImage = LinkAnnotation(url: (URL(string: "pspdfkit://localhost/Bundle/exampleImage.jpg"))!)
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        anImage.boundingBox = CGRect(origin: .zero, size: document.pageInfoForPage(at: 2)!.size)
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        anImage.pageIndex = 2
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        document.add(annotations: [anImage])
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        let controller = PDFViewController(document: document)
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        return controller
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    }
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}
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// MARK: - Annotation Links to external documents
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class AnnotationLinkstoExternalDocumentsExample: Example {
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    override init() {
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        super.init()
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        title = "Annotation Links to external documents"
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        contentDescription = "PDF links can point to pages within the same document, or also different documents or websites."
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        category = .annotations
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        priority = 600
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController? {
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        let document = AssetLoader.document(for: "one.pdf")
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        return PDFViewController(document: document)
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    }
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}