iOS UILabel显示HTML文本

 NSString * htmlString = @" Some html string \n 13\" color=\"red\">This is some text! ";
 NSAttributedString * attrStr = [[NSAttributedString alloc] initWithData:[htmlString dataUsingEncoding:NSUnicodeStringEncoding] options:@{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes:nil error:nil];
 UILabel * myLabel = [[UILabel alloc] initWithFrame:self.view.bounds];
 myLabel.attributedText = attrStr;
 [self.view addSubview:myLabel];

只能在iOS7以后运行