我正在努力将
NSAttributedString
替换为 AttributedString
但未能成功使附件工作。尽管我应用了附件,但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)
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:
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例子:
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)
}()