iOS WKWebView 退出后停止播放音频/视频

1.注入使网页停止音频、视频播放的JS代码(Swift 4)：

 1         let pauseJSString:String =
 2 """
 3 var videos = document.getElementsByTagName("video");
 4         function pauseVideo(){
 5             var len = videos.length
 6             for(var i=0;i<len;i++){
 7                 videos[i].pause();
 8             }
 9         }
10         var audios = document.getElementsByTagName("audio");
11         function pauseAudio(){
12             var len = audios.length
13             for(var i=0;i<len;i++){
14                 audios[i].pause();
15             }
16         }
17 """
18         let pauseJS:WKUserScript = WKUserScript.init(source: pauseJSString, injectionTime: WKUserScriptInjectionTime.atDocumentStart, forMainFrameOnly: true)
19
20         let userContentCtrl:WKUserContentController = WKUserContentController.init()
21         userContentCtrl.addUserScript(pauseJS)
22         conf.userContentController = userContentCtrl
23
24         webView = WKWebView.init(frame: CGRect.zero, configuration: conf)

2.退出前，调用暂停播放的JS函数(Swift 4)：

    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)

        pausePlay()
    }

    /// 暂停播放网页内的音频、视频
    func pausePlay(){
        mWebView.evaluateJavaScript("pauseVideo()") { (data, error) in
        }
        mWebView.evaluateJavaScript("pauseAudio()") { (data, error) in
        }
    }

原文地址：http://www.cnblogs.com/ficow/p/7637922.html