This is how to detect screen recording and snapshot events in iOS using SwiftUI

ScreenRecordingDetection.swift

import SwiftUI

@main
struct ScreenCaptureBlockerApp: App {
    @State private var hidingScreen = false
    
    private var window: UIWindow? {
        guard
            let scene = UIApplication.shared.connectedScenes.first,
            let sceneDelegate = scene.delegate as? UIWindowSceneDelegate,
            let uiWindow = sceneDelegate.window
        else {
            return nil
        }
        return uiWindow
    }
    
    var body: some Scene {
        WindowGroup {
            ZStack {
                ContentView()
                if hidingScreen {
                    Rectangle().ignoresSafeArea()
                }
            }
            // Sends a notification when the contents of the screen are being recorded, mirrored,
            // sent over AirPlay, or otherwise cloned to another destination.
            .onReceive(NotificationCenter.default.publisher(for: UIScreen.capturedDidChangeNotification)) { _ in
                hidingScreen = window?.screen.isCaptured ?? false
            }
            // Sends a notification after a screenshot is taken.
            .onReceive(NotificationCenter.default.publisher(for: UIApplication.userDidTakeScreenshotNotification)) { _ in
                print("User just took a screen shot")
            }
        }
    }
}