/// 快速改变字间距

    /// - Parameter space:

    funcchangeWordSpace(space:CGFloat) {

        guardlettext =self.textelse{return}

        letattributedString =NSMutableAttributedString.init(string: text)

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

        self.attributedText= attributedString

        self.sizeToFit()

    }