如何向 AttributedString 添加图像附件？答案

【问题标题】：How do you add an image attachment to an AttributedString?如何向 AttributedString 添加图像附件？
【发布时间】：2023-02-21 02:58:09
【问题描述】：

我正在努力将 NSAttributedString 替换为 AttributedString，但未能使附件正常工作。尽管我应用了附件，但该图像并未出现在字符串中。

let textAttachment = NSTextAttachment(image: UIImage(systemName: "exclamationmark.triangle.fill")!)
textAttachment.accessibilityLabel = "Warning"

// Original code
label.attributedText = NSAttributedString(attachment: textAttachment)

// New code
var attributedString = AttributedString()
attributedString.attachment = textAttachment
label.attributedText = NSAttributedString(attributedString)

【问题讨论】：

标签： ios nsattributedstring ios15 attributedstring

【解决方案1】：

NSAttributedString(attachment:) 神奇地创建了一个带有单个字符的 NSAttributedString（NSAttachmentCharacter 是 U+FFFC 对象替换字符）并应用文本附件属性以用图像替换该字符。

使用新的 AttributedString API，您需要手动复制它：

let textAttachment = NSTextAttachment(image: UIImage(systemName: "exclamationmark.triangle.fill")!)
textAttachment.accessibilityLabel = "Warning"

let attributedString = AttributedString("(UnicodeScalar(NSTextAttachment.character)!)", attributes: AttributeContainer.attachment(textAttachment))

label.attributedText = NSAttributedString(attributedString)

这是一个用图像替换子字符串的示例：

let addString = "+"
let string = "Tap (addString) to add a task."
let addTextAttachment = NSTextAttachment(image: UIImage(systemName: "plus.square")!)

// NSAttributedString
label.attributedText = {
    let attributedString = NSMutableAttributedString(string: string)
    attributedString.replaceCharacters(in: (attributedString.string as NSString).range(of: addString), with: NSAttributedString(attachment: addTextAttachment))
    return attributedString
}()

// AttributedString
label.attributedText = {
    var attributedString = AttributedString(string)
    let attachmentString = AttributedString("(UnicodeScalar(NSTextAttachment.character)!)", attributes: AttributeContainer.attachment(addTextAttachment))
    attributedString.replaceSubrange(attributedString.range(of: addString)!, with: attachmentString)
    return NSAttributedString(attributedString)
}()

【讨论】：