Add analytics to PDF components in Swift for iOS

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//
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//  Copyright © 2015-2026 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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// Extending the type with custom events.
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extension PDFAnalytics.EventName {
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    static var catalogAnalyticsExampleOpen = PDFAnalytics.EventName(rawValue: "catalog_analytics_example_open")
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    static var catalogAnalyticsExampleExit = PDFAnalytics.EventName(rawValue: "catalog_analytics_example_exit")
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}
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class AnalyticsClientExample: Example, PDFViewControllerDelegate {
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    class CustomAnalyticsClient: PDFAnalyticsClient {
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        func logEvent(_ event: PDFAnalytics.EventName, attributes: [String: Any]?) {
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            print("\(event) \(String(describing: attributes))")
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        }
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    }
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    let analyticsClient = CustomAnalyticsClient()
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    override init() {
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        super.init()
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        title = "Analytics Client"
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        contentDescription = "Example implementation of PDFAnalyticsClient that logs events to console."
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        category = .analyticsClient
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        priority = .max // this places the example at the bottom of the list, obviously ;)
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController {
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        let document = AssetLoader.document(for: .welcome)
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        let analytics = SDK.shared.analytics
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        analytics.add(analyticsClient)
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        analytics.enabled = true
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        let controller = PDFViewController(document: document)
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        controller.delegate = self
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        // sending custom events
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        analytics.logEvent(.catalogAnalyticsExampleOpen)
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        return controller
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    }
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    func pdfViewControllerDidDismiss(_ pdfController: PDFViewController) {
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        let analytics = SDK.shared.analytics
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        // sending custom events
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        analytics.logEvent(.catalogAnalyticsExampleExit)
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        analytics.remove(analyticsClient)
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        analytics.enabled = false
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    }
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}