Bionik6

func generateUniqueKey(keys: String...) -> String {
  let newArray = keys.sort()
  var cuttedStr = [String]()
  for str in newArray {
    let newString = NSString(string: str)
    let result = newString.substringWithRange(NSRange(location: 0, length: 8))
    cuttedStr.append(result)
  }
  return cuttedStr.joinWithSeparator("-")
}