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

 1 private func creationTextView(){
 2         
 3         let viewBg = UIView()
 4         self.view.addSubview(viewBg)
 5         viewBg.frame = CGRect(x:20, y:84, SCREEN_WITH - 40, height:220)
 6         viewBg.backgroundColor = UIColor.white
 7         viewBg.layer.borderColor = UIColor.init(red: 208/255.0, green: 208/255.0, blue: 208/255.0, alpha: 1).cgColor
 8         viewBg.layer.borderWidth = 1
 9         viewBg.layer.cornerRadius = 3
10         viewBg.clipsToBounds = true
11         
12         
13         let textView = UITextView()
14         viewBg.addSubview(textView)
15         
16         textView.delegate = self
17         textView.backgroundColor = UIColor.white
18         textView.tintColor = UIColor.red
19         textView.font = UIFont.systemFont(ofSize: 18)
20         textView.textAlignment = .left
21         textView.contentInset = UIEdgeInsetsMake(0, 0, 60, 0)
22         //可以滚动
23         textView.isScrollEnabled = true
24         //自适应高度
25         textView.autoresizingMask = UIViewAutoresizing.flexibleHeight
26         
27         textView.snp.makeConstraints { (mark) in
28             mark.top.equalTo(1)
29             mark.left.equalTo(1)
30             mark.right.equalTo(1)
31             mark.bottom.equalTo(-22)
32         }
33         
34         //反馈字符长度限制
35         viewBg.addSubview(label_length)
36         label_length.text = "150"
37         label_length.textColor = ColorViewBG
38         
39         label_length.textAlignment = .right
40         label_length.snp.makeConstraints { (mark) in
41             mark.bottom.equalTo(-10)
42             mark.right.equalTo(-8)
43             mark.height.equalTo(12)
44             mark.width.equalTo(100)
45         }
46         
47         
48     }

　　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!

1  // MARK: -TextViewDelegate
2     
3     func textViewDidChange(_ textView: UITextView) {
4         //计算剩余可输入字符长度
5         let length = textView.text.characters.count
6         label_length.text = "\(150 - length)"
7         
8         
9     }