带有手势识别器的 UITextView - 有条件地将触摸转发到父视图

在尝试了Swapnil Luktuke 的答案（至少在我理解的范围内）无济于事之后，以及以下所有可能的组合：

• 实现方法UIGestureRecognizerDelegate，
• 覆盖UITapGestureRecognizer，
• 有条件地调用ignore(_:for:)等

（也许在绝望中我错过了一些明显的东西，但谁知道......）

...我放弃并决定遵循@danyapata 在对我的问题的评论中的建议，并将UITextView 子类化。

部分基于在这个 Medium post上找到的代码，我想出了这个UITextView子类：

import UIKit

/**
 Detects taps on subregions of its attributed text that correspond to custom,
 named attributes.

 - note: If no tap is detected, the behavior is equivalent to a text view with
 `isUserInteractionEnabled` set to `false` (i.e., touches "pass through"). The
 same behavior doesn't seem to be easily implemented using just stock
 `UITextView` and gesture recognizers (hence the need to subclass).
 */
class LinkTextView: UITextView {

    private var tapHandlersByName: [String: [(() -> Void)]] = [:]

    /**
     Adds a custom block to be executed wjhen a tap is detected on a subregion
     of the **attributed** text that contains the attribute named accordingly.
     */
    public func addTapHandler(_ handler: @escaping(() -> Void), forAttribute attributeName: String) {
        var handlers = tapHandlersByName[attributeName] ?? []
        handlers.append(handler)
        tapHandlersByName[attributeName] = handlers
    }

    // MARK: - Initialization

    override init(frame: CGRect, textContainer: NSTextContainer?) {
        super.init(frame: frame, textContainer: textContainer)
        commonSetup()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    override func awakeFromNib() {
        super.awakeFromNib()
        commonSetup()
    }

    private func commonSetup() {
        self.delaysContentTouches = false
        self.isScrollEnabled = false
        self.isEditable = false
        self.isUserInteractionEnabled = true
    }

    // MARK: - UIView

    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        guard let attributeName = self.attributeName(at: point), let handlers = tapHandlersByName[attributeName], handlers.count > 0 else {
            return nil // Ignore touch
        }
        return self // Claim touch
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesEnded(touches, with: event)

        // find attribute name
        guard let touch = touches.first, let attributeName = self.attributeName(at: touch.location(in: self)) else {
            return
        }

        // Execute all handlers for that attribute, once:
        tapHandlersByName[attributeName]?.forEach({ (handler) in
            handler()
        })
    }

    // MARK: - Internal Support

    private func attributeName(at point: CGPoint) -> String? {
        let location = CGPoint(
            x: point.x - self.textContainerInset.left,
            y: point.y - self.textContainerInset.top)

        let characterIndex = self.layoutManager.characterIndex(
            for: location,
            in: self.textContainer,
            fractionOfDistanceBetweenInsertionPoints: nil)

        guard characterIndex < self.textStorage.length else {
            return nil
        }

        let firstAttributeName = tapHandlersByName.allKeys.first { (attributeName) -> Bool in
            if self.textStorage.attribute(NSAttributedStringKey(rawValue: attributeName), at: characterIndex, effectiveRange: nil) != nil {
                return true
            }
            return false
        }
        return firstAttributeName
    }
}

像往常一样，我会等几天再接受我自己的答案，以防万一出现更好的东西......