Prevent iOS Screen Capture

PreventScreenCapture.swift

@available(iOS 13.0, *)
func makeSecure(window: UIWindow) {
  DispatchQueue.main.async {
    print("make window secure")
    let field = UITextField()
    field.isSecureTextEntry = true
    window.addSubview(field)
    
    window.layer.superlayer?.addSublayer(field.layer)
    field.layer.sublayers?.last?.addSublayer(window.layer)
  }
}