Add video, audio, image annotation to PDF in Swift for iOS

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//
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//  Copyright © 2020-2026 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 GalleryExample: Example, PDFViewControllerDelegate {
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    override init() {
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        super.init()
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        title = "Image/Audio/Video Gallery"
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        contentDescription = "Gallery example with video, images, and audio gallery items."
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        category = .multimedia
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        priority = 10
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController? {
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        let document = AssetLoader.document(for: .annualReport)
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        document.annotationSaveMode = .disabled
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        let pageSize = document.pageInfoForPage(at: 0)?.size ?? CGSize(width: 500, height: 500)
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        // Add local image gallery on page 1
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        let imageGalleryURL = URL(string: "pspdfkit://localhost/Bundle/sample.gallery")!
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        let imageGalleryAnnotation = LinkAnnotation(url: imageGalleryURL)
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        // y-axis is flipped in the PDF coordinate system.
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        let pageTopCenter = CGPoint(x: pageSize.width / 2, y: pageSize.height)
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        let imageGallerySize = CGSize(width: 300, height: 200)
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        let imageGalleryPosition = CGPoint(x: pageTopCenter.x - imageGallerySize.width / 2, y: pageTopCenter.y - imageGallerySize.height)
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        imageGalleryAnnotation.boundingBox = CGRect(origin: imageGalleryPosition, size: imageGallerySize)
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        document.add(annotations: [imageGalleryAnnotation])
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        // Add audio annotation on page 1
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        let audioAnnotationURL = URL(string: "pspdfkit://localhost/Bundle/NightOwl.m4a")!
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        let audioAnnotation = LinkAnnotation(url: audioAnnotationURL)
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        let pageCenter = CGPoint(x: pageSize.width / 2, y: pageSize.height / 2)
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        let audioAnnotationSize = CGSize(width: 300, height: 80)
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        let audioAnnotationPosition = CGPoint(x: pageCenter.x - audioAnnotationSize.width / 2, y: pageCenter.y - audioAnnotationSize.height / 2)
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        audioAnnotation.boundingBox = CGRect(origin: audioAnnotationPosition, size: audioAnnotationSize)
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        document.add(annotations: [audioAnnotation])
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        // Add a video gallery from local gallery data
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        let videoGalleryURL = URL(string: "pspdfkit://localhost/Bundle/video.gallery")!
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        let videoGalleryAnnotation = LinkAnnotation(url: videoGalleryURL)
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        let pageBottomCenter = CGPoint(x: 0.5 * pageSize.width, y: 0)
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        let videoGallerySize = CGSize(width: 380, height: 290)
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        let videoGalleryPosition = CGPoint(x: pageBottomCenter.x - videoGallerySize.width / 2, y: pageBottomCenter.y / 2.0)
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        videoGalleryAnnotation.boundingBox = CGRect(origin: videoGalleryPosition, size: videoGallerySize)
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        document.add(annotations: [videoGalleryAnnotation])
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        // Add local image on page 2
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        let imageURL = Bundle.main.bundleURL.appendingPathComponent("exampleimage.jpg")
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        let imageAnnotation = LinkAnnotation(url: imageURL)
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        imageAnnotation.linkType = .image
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        imageAnnotation.fillColor = .clear
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        imageAnnotation.boundingBox = CGRect(x: 3, y: 450, width: 300, height: 150)
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        imageAnnotation.pageIndex = 1
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        document.add(annotations: [imageAnnotation])
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        // Add local video on page 3
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        let localVideoURL = URL(string: "pspdfkit://localhost/Bundle/big_buck_bunny.mp4")!
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        let localVideoAnnotation = LinkAnnotation(url: localVideoURL)
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        let localVideoAnnotationSize = CGSize(width: 450, height: 300)
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        let localVideoAnnotationPosition = CGPoint(x: pageCenter.x - localVideoAnnotationSize.width / 2, y: pageCenter.y - localVideoAnnotationSize.height / 2)
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        localVideoAnnotation.boundingBox = CGRect(origin: localVideoAnnotationPosition, size: localVideoAnnotationSize)
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        localVideoAnnotation.pageIndex = 2
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        document.add(annotations: [localVideoAnnotation])
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        return PDFViewController(document: document)
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    }
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}