UILable 两端对齐

iOS

商品合计，活动优惠，实付，都是对齐的，后面的冒号":",是单独一个lable,实现，不然计算两端对齐一直不对

    // 调用方式
    justified(mLableNote)
    // 核心方法
    func justified(_ mLable:UILabel) {
        let text = mLable.text
        let textSize = text?.characters.count ?? 2
        if (text == nil) {
            return
        }
        let font = FontUtils.getThinFont(13)
        let textAttributes = [NSFontAttributeName: font]
        let textString = text! as NSString
        let attributeLength = textSize - 1
        let textRectSize = textString.boundingRect(with: CGSize(width: self.frame.size.width,height:2000), options: .usesLineFragmentOrigin, attributes: textAttributes, context: nil).size
        let margin = (mLable.frame.size.width - textRectSize.width) / CGFloat(attributeLength)
        let attributedString = NSMutableAttributedString(string: text ?? "")
        attributedString.addAttribute(NSKernAttributeName, value: margin, range: NSRange(location: 0,length: attributeLength) )
        mLable.attributedText = attributedString
    }