IOS UIWebView Modify User-agent

My requirement is not only to be able to change user-agent, but also to keep WebView the original user-agent information, that is, I need to append information on it. The answers are collected on StackOverflow and the final summary of the solutions is as follows:

At startup, for example, add the following code to the Appdelegate :

    Get the original user-agent of WebView    UIWebView *webview = [[UIWebView alloc] initwithframe:cgrectzero];    NSString *oldagent = [WebView stringbyevaluatingjavascriptfromstring:@ "navigator.useragent"];    NSLog (@ "Old agent:%@", oldagent);        add my info to the new agent    nsstring *newagent = [oldagent stringbyappendingstring:@ "jiecao/2.4.7 ch_appstore"];
   nslog (@ "New agent:%@", newagent);        Regist The new agent    nsdictionary *dictionnary = [[Nsdictionary alloc] initwithobjectsandkeys:newagent, @ " UserAgent ", nil];    [[Nsuserdefaults Standarduserdefaults] registerdefaults:dictionnary];

In this way, WebView at the request of the user-agent is we set this, if you need to change the user-agent in webview use process, you need to modify the user-agent in this manner, and then re-instantiate a webview.

IOS UIWebView Modify User-agent