gistfile1.txt

NSString *htmlString = @"<h1>Header</h1><h2>Subheader</h2><p>Some <em>text</em></p><img src='http://blogs.babble.com/famecrawler/files/2010/11/mickey_mouse-1097.jpg' width=70 height=100 />";
NSData *data = [htmlString dataUsingEncoding:NSUnicodeStringEncoding];

NSDictionary *attributes = @{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType };

NSAttributedString *attributedString = [[NSAttributedString alloc] initWithData:data options:attributes documentAttributes:nil error:nil];

textView.attributedText = attributedString;