Ios 识别标签中显示的属性字符串中的图像点击

我有一个属性字符串，如下所示，将显示在标签中

let someText = NSMutableAttributedString(string: "This is a sample text with")
let imageAttachment = NSTextAttachment()
imageAttachment.image = UIImage(named: "icon") 

let imageString = NSAttributedString(attachment: imageAttachment)
someText.append(imageString)
someText.append(NSAttributedString(string: "attached")
somelabel.attributedText = someText

标签显示

这是一个附有“图像”的示例文本

如何识别点击图像（而不是文本）执行操作？

• 创建一个新的NSAttributedStringKey，用于标识图像附件
• 然后使用图像创建一个NSTextAttachment，将其包装在一个NSMutableAttributeString中，并向其中添加自定义属性
• 最后，将包装器添加到完整的NSAttributedString，并附加一个UITapgestureRecognitor

• 然后，在UITapGestureRecognizer上的选择器中，只需查找该自定义标记

most位的代码：

extension NSAttributedStringKey {
static let imagePath = NSAttributedStringKey(rawValue: "imagePath")
}

何时设置文本显示

let fullString = NSMutableAttributedString()    
let imageAttachment = NSTextAttachment()
imageAttachment.image = image

let imageAttributedString: NSMutableAttributedString = NSAttributedString(attachment: imageAttachment).mutableCopy() as! NSMutableAttributedString

let customAttribute = [ NSAttributedStringKey.imagePath: imagePath ]
imageAttributedString.addAttributes(customAttribute, range: NSRange(location: 0, length: imageAttributedString.length))

fullString.append(imageAttributedString)

然后在点击操作调用的函数中：

    @objc func onImageTap(_ sender: UITapGestureRecognizer) {
      let textView = sender.view as! UITextView
      let layoutManager = textView.layoutManager

      // location of tap in textView coordinates
      var location = sender.location(in: textView)
      location.x -= textView.textContainerInset.left;
      location.y -= textView.textContainerInset.top;

      // character index at tap location
      let characterIndex = layoutManager.characterIndex(for: location, in: textView.textContainer, fractionOfDistanceBetweenInsertionPoints: nil)

      // if index is valid 
      if characterIndex < textView.textStorage.length {

        // check if the tap location has the custom attribute
        let attributeValue = textView.attributedText.attribute(NSAttributedStringKey.imagePath, at: characterIndex, effectiveRange: nil) as? String
        if let value = attributeValue {
            print("You tapped on \(NSAttributedStringKey.imagePath) and the value is: \(value)")
        }

    }

}

@objc func onImageTap（uu发送方：UITapGestureRecognitizer）{
设textView=sender.view为！UITextView
让layoutManager=textView.layoutManager
//点击在文本视图坐标中的位置
var location=sender.location（在：textView中）
location.x-=textView.textContainerSet.left；
location.y-=textView.textContainerSet.top；
//抽头位置的字符索引
让characterIndex=layoutManager.characterIndex（对于：位置，在：textView.textContainer中，插入点之间距离的分数：nil）
//如果索引有效
如果characterIndex

从那里你知道点击在图像中，你有图像框内的坐标，所以你可以使用这个组合来找出点击在图像中的位置