Change part of the text color.

String+ChangePartTextColor.swift

func attributedStringWithColor(_ strings: [String], color: UIColor,font : UIFont, characterSpacing: UInt? = nil) -> NSAttributedString {
  let attributedString = NSMutableAttributedString(string: self)
  for string in strings {
      let range = (self as NSString).range(of: string)
      attributedString.addAttribute(NSAttributedString.Key.foregroundColor, value: color, range: range)
      attributedString.addAttribute(NSAttributedString.Key.font,value: font,  range: range)
  }

  guard let characterSpacing = characterSpacing else {return attributedString}

  attributedString.addAttribute(NSAttributedString.Key.kern, value: characterSpacing, range: NSRange(location: 0, length: attributedString.length))

  return attributedString
}

/*
let textTitleNotNetwork: NSAttributedString = "¡Uy! No podemos conectarnos".attributedStringWithColor(["conectarnos"], color: UIColor(hexString: "#EF3340"), font: UIFont(fontStyle: .latoRegular, size: 24)!)
lblTitleNotNetwork.attributedText = textTitleNotNetwork
/*