Objective - C

I'm trying to extract an image from a rss feed link and place it in a UIImageView. I found this code below that extracts html tags from an html string, but how do change/revise the code so that it extracts from an NSURL instead of html string?

NSString *url = nil; NSString *htmlString = ... NSScanner *theScanner = [NSScanner scannerWithString:htmlString]; // find start of IMG tag [theScanner scanUpToString:@"