Swift3.0 UITextView写反馈界面

效果图

适配用的 SnapKit

使用介绍:  http://www.hangge.com/blog/cache/detail_1097.html

 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()
         }

     }

　　简单的计算字符长度,在这里输入内容超过时没有做限制和提醒!

  // 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)"

     }