问如何准确检测在Swift 4中的UILabels内是否点击了链接？

EN

import UIKit

class ClickableLabelTextView: UITextView {
    var delegate: DelegateForClickEvent?
    var ranges:[(start: Int, end: Int)] = []
    var page: String = ""
    var paragraph: Int?
    var clickedLink: (() -> Void)?
    var pressedTime: Int?
    var startTime: TimeInterval?

    override func awakeFromNib() {
        super.awakeFromNib()
        self.textContainerInset = UIEdgeInsets.zero
        self.textContainer.lineFragmentPadding = 0
        self.delaysContentTouches = true
        self.isEditable = false
        self.isUserInteractionEnabled = true
        self.isSelectable = false
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        startTime = Date().timeIntervalSinceReferenceDate
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        if let clickedLink = clickedLink {
            if let startTime = startTime {
                self.startTime = nil
                if (Date().timeIntervalSinceReferenceDate - startTime <= 0.2) {
                    clickedLink()
                }
            }
        }
    }

    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        var location = point
        location.x -= self.textContainerInset.left
        location.y -= self.textContainerInset.top
        if location.x > 0 && location.y > 0 {
            let index = self.layoutManager.characterIndex(for: location, in: self.textContainer, fractionOfDistanceBetweenInsertionPoints: nil)
            var count = 0
            for range in ranges {
                if index >= range.start && index < range.end {
                    clickedLink = {
                        self.delegate?.clickedLink(page: self.page, paragraph: self.paragraph, linkNo: count)
                    }
                    return self
                }
                count += 1
            }
        }
        clickedLink = nil
        return nil
    }
}

protocol DelegateName {
    func clickedLink(page: String, paragraph: Int?, linkNo: Int?)
}

func textView(_ textView: UITextView, shouldInteractWith URL: URL, 
    in characterRange: NSRange, interaction: UITextItemInteraction) -> Bool

import UIKit

class LinkTextView: UITextView {
  private var callback: (() -> Void)?
  private var pressedTime: Int?
  private var startTime: TimeInterval?
  private var initialized = false
  var linkDelegate: LinkTextViewDelegate?
  var textLinks: [String : String] = Dictionary() {
    didSet {
        initialized = false
        styleTextLinks()
    }
  }

  override func awakeFromNib() {
    super.awakeFromNib()
    self.textContainerInset = UIEdgeInsets.zero
    self.textContainer.lineFragmentPadding = 0
    self.delaysContentTouches = true
    self.isEditable = false
    self.isUserInteractionEnabled = true
    self.isSelectable = false
    styleTextLinks()
  }

  private func styleTextLinks() {
    guard !initialized && !textLinks.isEmpty else {
        return
    }
    initialized = true

    let alignmentStyle = NSMutableParagraphStyle()
    alignmentStyle.alignment = self.textAlignment        

    let input = self.text ?? ""
    let attributes: [NSAttributedStringKey : Any] = [
        NSAttributedStringKey.foregroundColor : self.textColor!,
        NSAttributedStringKey.font : self.font!,
        .paragraphStyle : alignmentStyle
    ]
    let attributedString = NSMutableAttributedString(string: input, attributes: attributes)

    for textLink in textLinks {
        let range = (input as NSString).range(of: textLink.0)
        if range.lowerBound != NSNotFound {
            attributedString.addAttribute(.underlineStyle, value: NSUnderlineStyle.styleSingle.rawValue, range: range)
        }
    }

    attributedText = attributedString
  }

  override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    startTime = Date().timeIntervalSinceReferenceDate
  }

  override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let callback = callback {
        if let startTime = startTime {
            self.startTime = nil
            if (Date().timeIntervalSinceReferenceDate - startTime <= 0.2) {
                callback()
            }
        }
    }
  }

  override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
    var location = point
    location.x -= self.textContainerInset.left
    location.y -= self.textContainerInset.top
    if location.x > 0 && location.y > 0 {
        let index = self.layoutManager.characterIndex(for: location, in: self.textContainer, fractionOfDistanceBetweenInsertionPoints: nil)
        for textLink in textLinks {
            let range = ((text ?? "") as NSString).range(of: textLink.0)
            if NSLocationInRange(index, range) {
                callback = {
                    self.linkDelegate?.didTap(text: textLink.0, withLink: textLink.1, inTextView: self)
                }
                return self
            }
        }
    }
    callback = nil
    return nil
  }
}

import Foundation

protocol LinkTextViewDelegate {
  func didTap(text: String, withLink link: String, inTextView textView: LinkTextView)
}

override func viewDidLoad() {
  super.viewDidLoad()
  myLinkTextView.linkDelegate = self
  myLinkTextView.textLinks = [
    "click here" : "https://wwww.google.com",
    "or here" : "#myOwnAppHook"
  ]
}