extension.swift

extension String {
  func getPartOfStringBoldandItalic(_ italicPart:String, font:UIFont)-> NSAttributedString{
      let attributtedString = NSMutableAttributedString(string: self)
      let attrs = [NSFontAttributeName:font]
      let rangePart: NSRange = (attributtedString.string as NSString).range(of: italicPart)
      attributtedString.addAttributes(attrs, range: rangePart)
      return attributtedString
    }
}