如何在 rtf 文件中写入 NSAttributedString？

如何在 rtf 文件中写入 NSAttributedString？我找到了一个古老的答案如何将属性字符串（文本）保存到文件（swift、cocoa）中？ https://stackoverflow.com/questions/33178895/how-can-i-save-the-attributed-string-text-into-file-swift-cocoa我不太明白我到底需要什么，也许某个地方存在新的不同方式？

您可以使用NSAttributedString's data(from:)将属性字符串转换为 rtf 数据的方法。

extension NSAttributedString {
    func rtf() throws -> Data {
        try data(from: .init(location: 0, length: length),
            documentAttributes: [.documentType: NSAttributedString.DocumentType.rtf,
                                 .characterEncoding: String.Encoding.utf8])
    }
}

let textView = UITextView()
textView.attributedText = .init(string: "abc",
                                attributes: [.font: UIFont(name: "Helvetica", size: 16)!])
do {
    let rtfURL = try FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false).appendingPathComponent("RichTextDocument.rtf")
    try textView.attributedText.rtf().write(to: rtfURL)
    print("saved")
} catch {
    print(error)
}