iOS中修改WebView默认的User Agent

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本文介绍在iOS应用中如何修改UIWebView的默认UserAgent，并提供两种有效解决方案：通过加载请求数据到UIWebView或修改默认UserAgent。

iOS中修改WebView默认的User Agent

2014-05-28 | 评论

今天遇到一个需求，因某些原因，需要在webview默认的user agent中增加一些自定义的东西。经测试发现，webview的-webView:shouldStartLoadWithRequest:navigationType:方法中修改request的UA或者重新load修改UA过的NSMutableURLRequest都不行，webview会替换成默认的UA，类似

 
    Mozilla/5.0 (iPod touch; CPU iPhone OS 7_1_1 like Mac OS X) AppleWebKit/537.51.2 (KHTML, like Gecko) Mobile/11D201

两个解决方案：

方案1：在`-webView:shouldStartLoadWithRequest:navigationType:`方法中同步加载到request的data，然后使用UIWebView的`-loadData:MIMEType:textEncodingName:baseURL:`方法加载data

 
   - (BOOL) webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    if (...) {
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
            NSHTTPURLResponse *response = nil;
            NSError *error = nil;
            NSData *data = [NSURLConnection sendSynchronousRequest:request
                                                 returningResponse:&response
                                                             error:&error];
            if (error) {
                // ...
            }
            dispatch_async(dispatch_get_main_queue(), ^{
                [self.webView loadData:data
                              MIMEType:response.MIMEType
                      textEncodingName:response.textEncodingName
                               baseURL:request.URL];
            });
        });
        return NO;
    }
    return YES;
}
 
 
 

方案2：在AppDelegate的`-applicationDidFinishLaunching:`方法中增加如下代码，修改默认User Agent

 
   @autoreleasepool {
    UIWebView* tempWebView = [[UIWebView alloc] initWithFrame:CGRectZero];
    NSString* userAgent = [tempWebView stringByEvaluatingJavaScriptFromString:@"navigator.userAgent"];
    NSString *ua = [NSString stringWithFormat:@"%@\\%@",
                    userAgent,
                    @"custom string"];
    [[NSUserDefaults standardUserDefaults] registerDefaults:@{@"UserAgent" : ua, @"User-Agent" : ua}];
#if !__has_feature(objc_arc)
    [tempWebView release];
#endif
}
 
 
 