Textkit custom uilabel identification link

1. Inherit DemoLabel.swift file , Inherit UILabel

class DemoLabel: UILabel {
    
    //MARK: -  Overridden properties 
    override var text: String?{
        didSet{
            prepareText()
        }
    }
    
    override var attributedText: NSAttributedString?{
        didSet{
            prepareText()
        }
    }
    //MARK:  -  Draw text 
    override func draw(_ rect: CGRect) {
        // Area 
        let range = NSRange(location: 0, length: textStorage.length)
        // draw  -  Layout manager drawing  textStorage  The content in 
        layoutManager.drawGlyphs(forGlyphRange: range, at: CGPoint.zero)
    }
    
    //MARK: -  Constructors 
    override init(frame: CGRect) {
        super.init(frame: frame)
        prepareTextSystem()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        prepareTextSystem()
    }
    
    // Prepare the text system 
    private func prepareTextSystem(){
        //1. Prepare text 
        prepareText()
        //2. Set object relationships 
        textStorage.addLayoutManager(layoutManager)
        layoutManager.addTextContainer(textContainer)
    }
    
    /// Prepare text content 
    private func prepareText(){
        if attributedText != nil{
            // Set the attribute text directly 
            textStorage.setAttributedString(attributedText!)
        }else if text != nil{
            textStorage.setAttributedString(NSAttributedString(string: text!))
        }else {
            textStorage.setAttributedString(NSAttributedString(string: ""))
        }
        //print(rangeForUrls)
        // Traverse  url  Array , Set text properties 
        guard let rangeForUrls = rangeForUrls else{
            return
        }
        for range in rangeForUrls{
            textStorage.addAttribute(.foregroundColor, value: UIColor.blue, range: range)
        }
        
    }
    
    ///  Prepare text content 
    override func layoutSubviews() {
        super.layoutSubviews()
        // Set the size of the text container 
        textContainer.size = bounds.size
    }
    
  //MARK: -  Lazy load properties 
   // Text content  -  Subclasses of variable attribute strings 
  private lazy var textStorage = NSTextStorage()
    // Layout manager - Responsible for text drawing 
  private lazy var layoutManager = NSLayoutManager()
    // Text container  -  Set the size of the drawing 
  private lazy var textContainer = NSTextContainer()
    
}

//MARK: -  Regular expression correlation function / attribute 
extension DemoLabel{
    /// Returns all in the string  URL  Linked range array 
    var rangeForUrls: [NSRange]?{
        //1. Define regular expressions 
        let pattern = "[a-zA-Z]*://[a-zA-Z0-9/\\.]*"
        let regex = try! NSRegularExpression(pattern: pattern, options: [])
        //2. Match all  url  link 
        let result = regex.matches(in: textStorage.string, options: [], range: NSRange(location: 0, length: textStorage.length))
        var array = [NSRange]()
        for m in result {
            array.append(m.range(at: 0))
        }
        return array
    }
}

2. stay Main.storyboard Add UILabel Control , To test

@IBOutlet weak var label: DemoLabel!
    
  override func viewDidLoad() {
        super.viewDidLoad()
        label.text = "http://www.apple.com http://www.hh.cn"
    }