Change user agent at run time

Question

I am trying to add mobile, desktop versions of the site on my application. But the problem is that the User Agent changes only immediately before loading webView. In my application, I add to the button one for Mobile and a second for the site version of Desktop . UIWebView select User Agent only at the beginning. Someone tell me if there is a way to change the User Agent at runtime. Thanks

  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

I recommend using WkWebView instead of UIWebView as it is more powerful

WkWebView iOS 9 has direct API

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