The best engineered approach would probably be to load the page up into a WebView, BUT use the WebResourceLoadDelegate to stop it wasting time downloading any resource that isn't the favicon.
WebView has a lot of overhead! It would be much more efficient to just use NSXMLDocument to download and parse the HTML. Using the XPath accessor methods in NSXML you can very easily search for that particular link and extract its URL.
It shouldn't take more than three or four lines of code if you don't mind doing it synchronously; if you want async, then use an NSURLRequest to download the HTML and pass the resulting data to NSXMLDocument.
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