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Reading HTML content from a UIWebView


Is it possible to read the raw HTML content of a web page that has been loaded into a UIWebView?

If not, is there another way to pull raw HTML content from a web page in the iPhone SDK (such as an equivalent of the .NET WebClient::openRead)?


Solution

  • The second question is actually easier to answer. Look at the stringWithContentsOfURL:encoding:error: method of NSString - it lets you pass in a URL as an instance of NSURL (which can easily be instantiated from NSString) and returns a string with the complete contents of the page at that URL. For example:

    NSString *googleString = @"http://www.google.com";
    NSURL *googleURL = [NSURL URLWithString:googleString];
    NSError *error;
    NSString *googlePage = [NSString stringWithContentsOfURL:googleURL 
                                                    encoding:NSASCIIStringEncoding
                                                       error:&error];
    

    After running this code, googlePage will contain the HTML for www.google.com, and error will contain any errors encountered in the fetch. (You should check the contents of error after the fetch.)

    Going the other way (from a UIWebView) is a bit trickier, but is basically the same concept. You'll have to pull the request from the view, then do the fetch as before:

    NSURL *requestURL = [[yourWebView request] URL];
    NSError *error;
    NSString *page = [NSString stringWithContentsOfURL:requestURL 
                                              encoding:NSASCIIStringEncoding
                                                 error:&error];
    

    EDIT: Both these methods take a performance hit, however, since they do the request twice. You can get around this by grabbing the content from a currently-loaded UIWebView using its stringByEvaluatingJavascriptFromString: method, as such:

    NSString *html = [yourWebView stringByEvaluatingJavaScriptFromString: 
                                             @"document.body.innerHTML"];
    

    This will grab the current HTML contents of the view using the Document Object Model, parse the JavaScript, then give it to you as an NSString* of HTML.

    Another way is to do your request programmatically first, then load the UIWebView from what you requested. Let's say you take the second example above, where you have NSString *page as the result of a call to stringWithContentsOfURL:encoding:error:. You can then push that string into the web view using loadHTMLString:baseURL:, assuming you also held on to the NSURL you requested:

    [yourWebView loadHTMLString:page baseURL:requestURL];
    

    I'm not sure, however, if this will run JavaScript found in the page you load (the method name, loadHTMLString, is somewhat ambiguous, and the docs don't say much about it).

    For more info: