UILabel+Extension.swift

func setRequired() {
        guard var labelText = self.text else { return }
        
        if labelText.range(of: "*") == nil {
            labelText = labelText + "*"
        }
        
        let range = (labelText as NSString).range(of: "*")
        let attributedString = NSMutableAttributedString(string: labelText)
        attributedString.addAttributes([.foregroundColor: UIColor.red], range: range)
        
        self.attributedText = attributedString
    }