NSTextView 在 mac os 上复制粘贴 NSTextAttachment

Question

我使用了 NSTextView，并插入了图像 NSTextAttachment。当我选择并复制它，然后粘贴它时，它将在 textview 中显示粘贴的图像，但我无法从 NSTextView.attributedString 获取内容字符串。为什么？

Answer 1

我遇到了类似的问题。不确定它是否正是您想要的，但我希望能够复制和粘贴 NSTextAttachment 的字符串表示形式。

我最终在我的自定义 NSTextView 类中覆盖了func writeSelection(to pboard: NSPasteboard, type: String) -> Bool：

override func writeSelection(to pboard: NSPasteboard, type: String) -> Bool {
    let selectedAttributedString = attributedString().attributedSubstring(from: selectedRange())
    let selectedAttributedStringCopy = NSMutableAttributedString(attributedString: selectedAttributedString)

    selectedAttributedStringCopy.enumerateAttribute(NSAttachmentAttributeName, in: NSMakeRange(0,(selectedAttributedString.string.characters.count)), options: .reverse, using:  {(_ value: Any?, _ range: NSRange, _ stop: UnsafeMutablePointer<ObjCBool>) -> Void in

        if let textAttachment = value as? NSTextAttachment, let textAttachmentCell = textAttachment.attachmentCell as? YouCustomTextAttachmentCellClass {
            var range2: NSRange = NSRange(location: 0,length: 0)
            let attributes = selectedAttributedStringCopy.attributes(at: range.location, effectiveRange: &range2)

            selectedAttributedStringCopy.replaceCharacters(in: range, with: NSMutableAttributedString(string: textAttachmentCell.yourStringRepresentation))
            selectedAttributedStringCopy.addAttributes(attributes, range: range)

            //  selectedAttributedStringCopy.insert(attachmentAttributedString, at: range.location)

        }
    })

    pboard.clearContents()
    pboard.writeObjects([selectedAttributedStringCopy])

    return true
}

请注意，我正在使用自定义 NSTextAttachmentCell 类，该类还记得它的字符串表示形式。