如何用WKWebview和UIWebview实现页面画外音

let webView = WKWebView(frame: CGRect(x: 0, y: 0, width: 320, height: 480))
let configuration = WKWebViewConfiguration()

let userContentController = WKUserContentController()
let userScript = WKUserScript(source: "document.addEventListener('play', function() { /* 处理外部音频播放事件 */ });", injectionTime: .atDocumentEnd, forMainFrameOnly: false)
userContentController.addUserScript(userScript)
configuration.userContentController = userContentController

view.addSubview(webView)

let url = URL(string: "https://example.com")
let request = URLRequest(url: url!)
webView.load(request)

let webView = UIWebView(frame: CGRect(x: 0, y: 0, width: 320, height: 480))

class ViewController: UIViewController, UIWebViewDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        webView.delegate = self
    }
    
    // 监听外部音频播放事件
    func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebView.NavigationType) -> Bool {
        if navigationType == .other {
            // 处理外部音频播放事件
        }
        return true
    }
}

view.addSubview(webView)

let url = URL(string: "https://example.com")
let request = URLRequest(url: url!)
webView.loadRequest(request)