import Foundation
import UIKit

let attrStr = try NSMutableAttributedString(
    data: "<b>sdad </b> assdds.".dataUsingEncoding(NSUnicodeStringEncoding)!,
    options: [NSDocumentTypeDocumentAttribute : NSHTMLTextDocumentType],
    documentAttributes: nil)

let fontNormal = UIFont(name: "Helvetica", size: 15)!
let fontBold = UIFont(name: "Helvetica-Bold", size: 15)!

func styled(attrStr: NSAttributedString) -> NSAttributedString {
    let att = NSMutableAttributedString(attributedString: attrStr)
    let rangeAll = NSRange(location: 0, length: att.length)
    att.enumerateAttributesInRange(rangeAll, options: .LongestEffectiveRangeNotRequired) { attrs, range, stop in
        let font = attrs["NSFont"]!
        att.addAttribute(NSFontAttributeName, value: font.fontName.containsString("Bold") ? fontBold : fontNormal, range: range)
    }
    att.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range: rangeAll)
    return att
}

let s = styled(attrStr)

//let rangeAll = NSRange(location: 0, length: attrStr.length)
//attrStr.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range: rangeAll)
//attrStr.addAttribute(NSFontAttributeName, value: UIFont(name: "Times New Roman", size: 18.0)!, range: rangeAll)