StackOverflow2013

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copied!<p>From the research I did, the reason why you can't set the User-Agent is that the UIWebView is setting the User-Agent value just before it sends out the request, that is, after you've made your request from your code. </p> <p>The trick to get around this problem is to use something called "method swizzling", an advanced and potentially dangerous Objective-C concept that swaps out a standard method with one you provide. The end result is that when your request is sent out and the framework code adds the User-Agent it will be fooled into using the method you provided.</p> <p>The following explains what I did to implement this but I am no Objective-C expert and would suggest to you to do some research to familiarize yourself with the technique. In particular, there was a link out there explaining better than me what is going on here, but at the moment I can't find it.</p> <p>1) Add a category on NSObject to allow swizzling.</p> <pre><code>@interface NSObject (Swizzle) + (BOOL) swizzleMethod:(SEL)origSelector withMethod:(SEL)newSelector; @end @implementation NSObject (Swizzle) + (BOOL) swizzleMethod:(SEL) origSelector withMethod:(SEL)newSelector { Method origMethod= class_getInstanceMethod(self, origSelector); Method newMethod= class_getInstanceMethod(self, newSelector); if (origMethod && newMethod) { if (class_addMethod(self, origSelector, method_getImplementation(newMethod), method_getTypeEncoding(newMethod))) { class_replaceMethod(self, newSelector, method_getImplementation(origMethod), method_getTypeEncoding(origMethod)); } else { method_exchangeImplementations(origMethod, newMethod); } return YES; } return NO; } @end </code></pre> <p>2) Subclass NSMutableURLRequest to allow the swizzle:</p> <pre><code>@interface NSMutableURLRequest (MyMutableURLRequest) + (void) setupUserAgentOverwrite; @end @implementation NSMutableURLRequest (MyMutableURLRequest) - (void) newSetValue:(NSString*)value forHTTPHeaderField:(NSString*)field { if ([field isEqualToString:@"User-Agent"]) { value = USER_AGENT; // ie, the value I want to use. } [self newSetValue:value forHTTPHeaderField:field]; } + (void) setupUserAgentOverwrite { [self swizzleMethod:@selector(setValue:forHTTPHeaderField:) withMethod:@selector(newSetValue:forHTTPHeaderField:)]; } @end </code></pre> <p>3) Call the static method to swap out the method. I made this call in didFinishLaunchingWithOptions:</p> <pre><code>// Need to call this method so that User-Agent get updated correctly: [NSMutableURLRequest setupUserAgentOverwrite]; </code></pre> <p>4) And then used it like this. (The connection delegate saves the data in a mutable array and then manually sets the UIWebView using its loadData method when it finishes loading).</p> <pre><code>- (void)loadWithURLString:(NSString*)urlString { NSURL *url = [NSURL URLWithString:urlString]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; _connection = [NSURLConnection connectionWithRequest:request delegate:self]; [_connection start]; } </code></pre>

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