Custom PDF stamp annotation in Swift for iOS

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//
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//  Copyright © 2017-2026 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 CustomStampAnnotationsExample: Example, PDFViewControllerDelegate {
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    override init() {
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        super.init()
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        title = "Custom stamp annotations"
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        contentDescription = "Customizes the default set of stamps in the PSPDFStampViewController."
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        category = .annotations
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        priority = 200
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController? {
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        var defaultStamps = [StampAnnotation]()
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        for stampTitle in ["Great!", "Stamp", "Like"] {
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            let stamp = StampAnnotation(title: stampTitle)
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            stamp.boundingBox = CGRect(x: 0, y: 0, width: 200, height: 70)
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            defaultStamps.append(stamp)
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        }
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        // Careful with memory - you don't wanna add large images here.
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        let imageStamp = StampAnnotation()
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        imageStamp.image = UIImage(named: "exampleimage.jpg")
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        imageStamp.boundingBox = CGRect(x: 0, y: 0, width: (imageStamp.image?.size.width)! / 4, height: (imageStamp.image?.size.height)! / 4)
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        defaultStamps.append(imageStamp)
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        let logoURL = AssetLoader.assetURL(for: "PSPDFKit Logo.pdf")
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        let vectorStamp = StampAnnotation()
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        vectorStamp.boundingBox = CGRect(x: 0, y: 0, width: 200, height: 200)
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        vectorStamp.appearanceStreamGenerator = FileAppearanceStreamGenerator(fileURL: logoURL)
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        defaultStamps.append(vectorStamp)
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        StampViewController.defaultStampAnnotations = defaultStamps
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        let document = AssetLoader.document(for: .annualReport)
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        // `CustomPDFViewController` is used as it resets the above set `defaultStampAnnotations`.
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        let pdfController = CustomPDFViewController(document: document, delegate: self)
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        pdfController.navigationItem.rightBarButtonItems = [pdfController.annotationButtonItem]
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        return pdfController
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    }
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    // MARK: - PDFViewControllerDelegate
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    func pdfViewController(_ pdfController: PDFViewController, shouldShow controller: UIViewController, options: [String: Any]? = nil, animated: Bool) -> Bool {
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        let stampController = PSPDFChildViewControllerForClass(controller, StampViewController.self) as? StampViewController
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        stampController?.customStampEnabled = false
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        stampController?.dateStampsEnabled = false
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        return true
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    }
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}
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private class CustomPDFViewController: PDFViewController {
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    deinit {
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        // Reset the default stamp annotations so that the other examples can use the default stamps.
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        StampViewController.defaultStampAnnotations = nil
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    }
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}