Add image gallery to PDF in Swift for iOS

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//
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//  Copyright © 2021-2026 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 ButtonImageGalleryExample: Example, PDFViewControllerDelegate {
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    override init() {
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        super.init()
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            title = "Galleries with button activation"
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            contentDescription = "Buttons that show/hide gallery or videos."
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            category = .multimedia
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            priority = 51
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController? {
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        let document = AssetLoader.temporaryDocument(with: "")
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        document.annotationSaveMode = .disabled
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        do {
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            let title = FreeTextAnnotation(contents: "Galleries with button activation")
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            title.fontSize = 20
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            title.boundingBox = CGRect(x: 20.0, y: 750.0, width: 300.0, height: 40.0)
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            document.add(annotations: [title], options: nil)
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        }
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        do {
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            let text = FreeTextAnnotation(contents: "Gallery that opens inline:\n\n[Action.Option.buttonKey: NSNumber(value: true)]")
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            text.fontSize = 15
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            text.boundingBox = CGRect(x: 20.0, y: 600.0, width: 350.0, height: 60.0)
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            // Setting the button option to yes will show the default button.
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            let url = URL(string: "pspdfkit://localhost/Bundle/sample.gallery")!
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            let galleryAction = URLAction(url: url, options: [
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                Action.Option.buttonKey: true
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            ])
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            let galleryAnnotation = LinkAnnotation(action: galleryAction)
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            galleryAnnotation.boundingBox = CGRect(x: 80.0, y: 550.0, width: 300.0, height: 200.0)
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            document.add(annotations: [text, galleryAnnotation], options: nil)
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        }
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        do {
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            let text = FreeTextAnnotation(contents: "Gallery that opens inline with a custom button image:\n\n[Action.Option.buttonKey: \"pspdfkit://localhost/Bundle/eye\"]")
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            text.fontSize = 15
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            text.boundingBox = CGRect(x: 20.0, y: 450.0, width: 450.0, height: 60.0)
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            // Setting the button option to a URL will load this URL. The URL can be local or remote. Use pspdfkit://localhost for local URLs.
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            // For remote URLs, use something such as:
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            // [Action.Option.buttonKey: "https://www.dropbox.com/s/8diroz5npb3eciy/webimage2%402x.png?raw=1"]
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            let url = URL(string: "pspdfkit://localhost/Bundle/sample.gallery")!
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            let action = URLAction(url: url, options: [
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                Action.Option.buttonKey: "pspdfkit://localhost/Bundle/eye"
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            ])
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            let galleryAnnotation = LinkAnnotation(action: action)
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            galleryAnnotation.boundingBox = CGRect(x: 260.0, y: 400.0, width: 300.0, height: 200.0)
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            document.add(annotations: [text, galleryAnnotation], options: nil)
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        }
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        do {
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            let text = FreeTextAnnotation(contents: "Link that opens modally:\n\nAction.Option.buttonKey: NSNumber(value: true),\nAction.Option.modalKey: NSNumber(value: true),\nAction.Option.sizeKey: NSNumber(cgSize: CGSize(width: 550.0, height: 550.0))")
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            text.fontSize = 15.0
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            text.boundingBox = CGRect(x: 20.0, y: 80.0, width: 600.0, height: 120.0)
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            let url = URL(string: "pspdfkit://www.apple.com/ipad/")!
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            let action = URLAction(url: url, options: [
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                Action.Option.buttonKey: true,
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                Action.Option.modalKey: true,
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                Action.Option.sizeKey: CGSize(width: 550.0, height: 550.0)
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            ])
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            let webAnnotation = LinkAnnotation(action: action)
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            webAnnotation.boundingBox = CGRect(x: 205.0, y: 175.0, width: 30.0, height: 30.0)
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            document.add(annotations: [text, webAnnotation], options: nil)
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        }
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        let pdfController = PDFViewController(document: document) { builder in
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            // Disable free text editing here as we use them as labels.
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            builder.editableAnnotationTypes = nil
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        }
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        return pdfController
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    }
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}