如何在UIView上关闭SFSafariViewController

import SafariServices

class ViewController: UIViewController, SFSafariViewControllerDelegate {
    // ...
    
    func openSafariViewController() {
        let url = URL(string: "https://www.example.com")!
        let safariViewController = SFSafariViewController(url: url)
        safariViewController.delegate = self
        present(safariViewController, animated: true, completion: nil)
    }
    
    // ...
}

func safariViewControllerDidFinish(_ controller: SFSafariViewController) {
    dismiss(animated: true) {
        let alert = UIAlertController(title: "提示", message: "Safari浏览器已关闭", preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "确定", style: .default, handler: nil))
        self.present(alert, animated: true, completion: nil)
    }
}

@IBAction func closeSafariViewController(_ sender: UIButton) {
    dismiss(animated: true, completion: nil)
}