Html existing in XML to string

I'm using NSXMLParser to parse a RSS XML file but I get html tags in my description string. I'm trying to know which way is the best to parse html tags and encode to plain text to store in a string. I'm doing something like this:

func parser(parser: NSXMLParser, foundCharacters string: String) {

    var error: NSError?

    switch feedElement! {
    case "title":
        if feedTitle != nil {
            feedTitle! += string
        }
    case "link":
        if feedLink != nil {
            feedLink! += string
        }
    case "description":
        if feedDescription != nil {
            feedDescription += string
        }
    default:
        break
    }
}

I've also tried something like this but my app just turns very very slow.

case "description":
    if feedDescription != nil 
        var plainString = NSAttributedString(data: NSData(data: string .dataUsingEncoding(NSUTF8StringEncoding)!), options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: NSNumber.numberWithInt(1)], documentAttributes: nil, error: &error)    
        feedDescription += plainString.string
    }

Thank you in advance.