使图像在UITextView中可点击

Question

我正在尝试创建一个笔记记录应用，您可以在其中单击图像以及正常编辑文本。

当前，我已经在调用的UITextView上放置了一个轻击手势识别器：

    @IBAction func onImageTap(_ sender: UITapGestureRecognizer) {
        if sender.state == .ended {
            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 image attribute
                let attributeValue = textView.attributedText.attribute(NSAttributedString.Key.fileType, at: characterIndex, effectiveRange: nil) as? String
                // if location does have custom attribute, extract the url of the PDF and perform segue to display PDF
                if let value = attributeValue {
                    if value == "PDF" {
                        storedFileName = textView.attributedText.attribute(NSAttributedString.Key.fileName, at: characterIndex, effectiveRange: nil) as? String
                        performSegue(withIdentifier: "displayPDF", sender: textView)
                    }
                } else {
                    textView.isEditable = true
                    textView.becomeFirstResponder()
                }
            }
        }
    }

这会使所有图像都可点击。但是，然后我无法再单击UITextView中的任何其他位置来编辑文本。

我该怎么做，以使图像保持可单击状态，但是，如果我单击UITextView中的其他位置，则可以开始编辑文本了？

Answer 1

假设您已将图像作为UITextView添加到NSAttachment，从iOS 9.0开始，您可以检查给定的NSRange是否包含附件：

例如，如果图像位于第25个字符处：

let characterIndex = 25
let range = NSRange(location: characterIndex, length: 1)

// Using an IBOutlet in the current view controller called 'textView'
if textView.attributedText.containsAttachments(in: range) {
    // Do some activity
}