1. Create a UITextView with a border

override func viewDidLoad() {
        super.viewDidLoad()
        //Define control x:30 y:100 width:300 height:40
        let textView = UITextView(frame: CGRect(x: 30, y: 100, width: 300, height: 40))
        self.view.addSubview(textView)
        textView.layer.borderWidth = 1//Border width
        textView.layer.borderColor = UIColor.black.cgColor//Border color
        textView.text = "This is a black border UITextView"//Set text content
    }

2. Set font property, font color textColor and alignment textAlignment

textView.font = UIFont.boldSystemFont(ofSize: 12)//Set font property
textView.textColor = UIColor.red//Set font color
textView.textAlignment = .center//Set content alignment

3. Set whether it is editable and whether the content is optional

textView.isEditable = false//textView cannot be edited
textView.isSelectable = true//Content optional

The operation effect is as follows:

4. Automatically link the phone number and web address in the text

textView.dataDetectorTypes = [] //No links
textView.dataDetectorTypes = UIDataDetectorTypes.phoneNumber //Only phone plus link
textView.dataDetectorTypes = UIDataDetectorTypes.link //Only URL and link
textView.dataDetectorTypes = UIDataDetectorTypes.all //Add both phone and website

To add a link, you first need to set textview to a non editable state, for example:

textView.isEditable = false//textView cannot be edited
textView.dataDetectorTypes = .all//Set link type
textView.text = "phone:13859222222,\n link:https://www.baidu.com "/ / set text content

5. Customize the selection menu
Often we can do some special operations besides copying and cutting after selecting the content, such as sharing to social media such as wechat. Let's give a simple example of a custom selection menu

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        //Define control x:30 y:100 width:300 height:40
        let textView = UITextView(frame: CGRect(x: 30, y: 100, width: 300, height: self.view.bounds.height - 100))
        self.view.addSubview(textView)
        textView.layer.borderWidth = 1//Border width
        
        textView.layer.borderColor = UIColor.black.cgColor//Border color
        textView.font = UIFont.boldSystemFont(ofSize: 12)//Set font property
        textView.textColor = UIColor.black//Set font color
        textView.textAlignment = .center//Set content alignment
        
        textView.isSelectable = true//Content optional
        
        textView.isEditable = true//textView cannot be edited
        textView.dataDetectorTypes = .all//Set link type
        textView.text = "Be a happy person from tomorrow\n Feed horses, chop firewood, travel around the world\n From tomorrow, care about food and vegetables\n I have a house facing the sea\n From tomorrow, communicate with every relative\n Tell them about my happiness\n The happy lightning told me\n I will tell everyone\n Give each river and mountain a warm name"//Set text content
        
        let wx = UIMenuItem(title: "WeChat", action: #selector(openWX))
        let menu = UIMenuController()
        menu.menuItems = [wx]
    }
    
    @objc func openWX(){
        print("Open wechat")
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

The operation effect is as follows:

This article just explains the most basic usage of UITextView, how to share the selected content to wechat through the user-defined selection menu, and interested partners can check the information by themselves