Earlier in UIKit Lifecycle app we could have done this by over riding UIApplication's sendEvent method like below

 class UserTappedOnScreenEvent: UIApplication {

// MARK: Post A Notification With Respect Key

   override func sendEvent(_ event: UIEvent) {
        //        InactivityWorker.start()
        NotificationCenter.default.post(Notification.init(name: Notification.Name(rawValue: "UserTappedOnScreenEvent")))
        super.sendEvent(event)
    }
}

But i can't find a way to do it in pure SwiftUI app.

Any help appreciated!!