UIWebView iOS5 changing user-agent

Question

How can I change the user-agent of UIWebView in iOS 5?

What I have done so far: Using the delegate call back, intercept the NSURLRequest, create a new url request and set it's user-agent as whatever I want, then download the data and reload the UIWebView with "loadData:MIMEType:....".

Problem: This causes infinite recursion, where I load the data, which calls the delegate back, which intern calls the delegate....

Here's the delegate method:

- (BOOL)webView:(UIWebView *)aWebView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {        dispatch_async(kBgQueue, ^{         NSURLResponse *response = nil;         NSMutableURLRequest *newRequest = [NSMutableURLRequest requestWithURL:[request URL]];         NSDictionary *headers = [NSDictionary dictionaryWithObject:                                  @"custom_test_agent" forKey:@"User-Agent"];         [newRequest setAllHTTPHeaderFields:headers];         [self setCurrentReqest:newRequest];         NSData *data = [NSURLConnection sendSynchronousRequest:newRequest                                               returningResponse:&response                                                           error:nil];         dispatch_sync(dispatch_get_main_queue(), ^{             [webView loadData:data                       MIMEType:[response MIMEType]               textEncodingName:[response textEncodingName]                        baseURL:[request URL]];         });     });      return YES; } 

Answer 1

Change the "UserAgent" default value by running this code once when your app starts:

NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:@"Your user agent", @"UserAgent", nil]; [[NSUserDefaults standardUserDefaults] registerDefaults:dictionary];   

EDIT: I have used this with great success, but want to add additional details. To get a user agent, you can enable the "Developer" menu, set the user agent, and then connect to this site to get it printed out for you: WhatsMyAgent. Likewise you can connect using any kind of mobile device, and get it that way too. BTW this is still working just fine in iOS7+

Answer 2

In Swift use this to set UserAgent,

func setUserAgent(){      var userAgent = NSDictionary(objectsAndKeys:  "YourUserAgentName","UserAgent")      NSUserDefaults.standardUserDefaults().registerDefaults(userAgent as [NSObject : AnyObject])  } 

Use this to test,

println(WebView.stringByEvaluatingJavaScriptFromString("navigator.userAgent"));