let str = "富文本设置"

      textView.isEditable = false

      self.view.addSubview(textView)

      let amountString = NSMutableAttributedString(string:str)

      let s = NSString(string: str)//需要这一步。

      let rang = s.range(of: s as String)

      amountString.addAttribute(NSFontAttributeName, value: UIFont.systemFont(ofSize: 13) ,range: rang)

      //行间距为5

      let paragraphStye = NSMutableParagraphStyle()

      paragraphStye.lineSpacing = 5

      amountString.addAttribute(NSParagraphStyleAttributeName, value: paragraphStye, range: rang)

      for i in 0..<arrStr.count{

         //与数组里相同的字符串，字体变大。也可改变颜色。

        //指定range范围内的文本改变。

         let newRange = s.range(of: arrStr[i] as String)

         amountString.addAttribute(NSForegroundColorAttributeName, value: UIColor.black, range: newRange)

         amountString.addAttribute(NSFontAttributeName, value: UIFont.systemFont(ofSize: 15) ,range: newRange)

      }

      textView.attributedText = amountString