title: does it have a function that change all NSStringEncoding into NSUTF8StringEncoding
body: <p>i want to download html code and save it to a html file.However, there are kinds of Encoding which are used into html files,such as NSUTF8StringEncoding,NSISOLatin1StringEncoding and so on. wethere it has a function that change the different files of encoding into the same,and when the webview load the html file,it looks like as normal.</p>