uilabel_touchevent.swift

typealias CustomLabelTouchHandler = (CustomLabel) -> Void
typealias CustomLabelTouchIndexHandler = (CustomLabel, Int) -> Void

private var touchHandler: CustomLabelTouchHandler?
private var touchHandlerWithIndex: CustomLabelTouchIndexHandler?

///Never ever use ide attribute text, then will trigger correctly
    @objc func didLabelTouchedWidthIndexHandler(_ gestureRecognizer: UIGestureRecognizer) {
        guard let attributedString = self.attributedText, let font = self.font else { return }
        
        let mutableAttribString = NSMutableAttributedString(attributedString: attributedString)
        mutableAttribString.addAttributes([NSAttributedString.Key.font: font], range: NSRange(location: 0, length: attributedString.length)) //!important
        
        let storage = NSTextStorage(attributedString: mutableAttribString)
        let layoutManager = NSLayoutManager()
        storage.addLayoutManager(layoutManager)

        let container = NSTextContainer(size: .init(width: self.bounds.size.width, height: self.bounds.size.height))
        container.lineFragmentPadding = 0
        container.lineBreakMode = self.lineBreakMode
        container.maximumNumberOfLines = self.numberOfLines
        
        layoutManager.addTextContainer(container)
        
        let locationInLabel = gestureRecognizer.location(in: gestureRecognizer.view)
        let indexOfCharacter = layoutManager.characterIndex(for: locationInLabel, in: container, fractionOfDistanceBetweenInsertionPoints: nil)
        
        var i = 0
        outer: for touchText in touchTexts {
            
            if let text = self.text, let regex = try? NSRegularExpression(pattern: touchText, options: []) {
                let matches = regex.matches(in: text, options: [], range: NSMakeRange(0, text.count))
                for match in matches {
                    if NSLocationInRange(indexOfCharacter, match.range) {
                        DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
                            self.touchHandlerWithIndex?(self, i)
                        }
                        break outer
                    }
                }
            }
            i += 1
        }
    }