private func creationTextView(){

         let viewBg = UIView()

         self.view.addSubview(viewBg)

         viewBg.frame = CGRect(x:, y:, width:SCREEN_WITH - , height:)

         viewBg.backgroundColor = UIColor.white

         viewBg.layer.borderColor = UIColor.init(red: /255.0, green: /255.0, blue: /255.0, alpha: ).cgColor

         viewBg.layer.borderWidth =

         viewBg.layer.cornerRadius =

         viewBg.clipsToBounds = true

         let textView = UITextView()

         viewBg.addSubview(textView)

         textView.delegate = self

         textView.backgroundColor = UIColor.white

         textView.tintColor = UIColor.red

         textView.font = UIFont.systemFont(ofSize: )

         textView.textAlignment = .left

         textView.contentInset = UIEdgeInsetsMake(, , , )

         //可以滚动

         textView.isScrollEnabled = true

         //自适应高度

         textView.autoresizingMask = UIViewAutoresizing.flexibleHeight

         textView.snp.makeConstraints { (mark) in

             mark.top.equalTo()

             mark.left.equalTo()

             mark.right.equalTo()

             mark.bottom.equalTo(-)

         }

         //反馈字符长度限制

         viewBg.addSubview(label_length)

         label_length.text = ""

         label_length.textColor = ColorViewBG

         label_length.textAlignment = .right

         label_length.snp.makeConstraints { (mark) in

             mark.bottom.equalTo(-)

             mark.right.equalTo(-)

             mark.height.equalTo()

             mark.width.equalTo()

         }

     }

  // MARK: -TextViewDelegate

     func textViewDidChange(_ textView: UITextView) {

         //计算剩余可输入字符长度

         let length = textView.text.characters.count

         label_length.text = "\(150 - length)"

     }