AddSiriButton.swift

// Add an "Add to Siri" button to a view.
func addSiriButton(to view: UIView) {
    let button = INUIAddVoiceShortcutButton(style: .blackOutline)
    button.translatesAutoresizingMaskIntoConstraints = false

    view.addSubview(button)
    view.centerXAnchor.constraint(equalTo: button.centerXAnchor).isActive = true
    view.centerYAnchor.constraint(equalTo: button.centerYAnchor).isActive = true

    button.addTarget(self, action: #selector(addToSiri(_:)), for: .touchUpInside)
}

// Present the Add Shortcut view controller after the
// user taps the "Add to Siri" button.
@objc
func addToSiri(_ sender: Any) {
    if let shortcut = INShortcut(intent: orderSoupOfTheDayIntent) {
        let viewController = INUIAddVoiceShortcutViewController(shortcut: shortcut)
        viewController.modalPresentationStyle = .formSheet
        viewController.delegate = self // Object conforming to `INUIAddVoiceShortcutViewControllerDelegate`.
        present(viewController, animated: true, completion: nil)
    }
}