swift - 运行时用户代理更改

Question

我正在尝试在我的应用程序中添加移动、桌面版网站功能。但问题是 User Agent 仅在加载 webView 之前立即更改。在我的应用程序中，我为 Mobile 添加了第一个按钮，为 Desktop 版本站点添加了第二个按钮。 UIWebView 在开始时选择 User Agent。谁能告诉我有什么方法可以在运行时更改 User Agent。谢谢

 var defaultUserAgent = String()
    @IBOutlet weak var webView: UIWebView!

    @IBOutlet weak var activityIndicator: UIActivityIndicatorView!

    override func viewDidLoad() {
        super.viewDidLoad()

        let url = NSURL(string: "https://www.youtube.com")
        let request = NSURLRequest(URL: url!)
        activityIndicator.hidesWhenStopped = true
        activityIndicator.startAnimating()
        webView.loadRequest(request)
    }

    @IBAction func mobile(sender: AnyObject) {
        NSUserDefaults.standardUserDefaults().registerDefaults(["UserAgent": defaultUserAgent])
        print(defaultUserAgent)

        let url = NSURL(string: "https://www.youtube.com")
        let request = NSURLRequest(URL: url!)
        activityIndicator.hidesWhenStopped = true
        activityIndicator.startAnimating()
        webView.loadRequest(request)

    }

    @IBAction func desktop(sender: AnyObject) {

        NSUserDefaults.standardUserDefaults().registerDefaults(["UserAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.109 Safari/537.36"])

        let url = NSURL(string: "https://www.youtube.com")
        let request = NSURLRequest(URL: url!)
        activityIndicator.hidesWhenStopped = true
        activityIndicator.startAnimating()
        webView.loadRequest(request)

    }

    func webViewDidFinishLoad(webView: UIWebView) {
        activityIndicator.stopAnimating()
        print(webView.stringByEvaluatingJavaScriptFromString("navigator.userAgent"))
        defaultUserAgent = webView.stringByEvaluatingJavaScriptFromString("navigator.userAgent")!
    }

Answer 1

我建议您使用 WkWebView 而不是 UIWebView 因为它相对更强大

iOS 9 的 WkWebView 有一个直接的 API

 if #available(iOS 9, *) {
            webViewObj.customUserAgent = "customUserAgentValue"
 }