Convert NSAttributedString into Data for storage

I have a UITextView with attributed text and allowsEditingTextAttributes set to true.

I'm trying to convert the attributed string into a Data object, using the following code:

let text = self.textView.attributedText
let data = try text.data(from: NSMakeRange(0, text.length), documentAttributes: [:])

However, this is throwing the following error:

Error Domain=NSCocoaErrorDomain Code=66062 "(null)"

Any ideas what this error means or what could cause this? I'm on the latest Xcode and iOS. Thanks.

You need to specify what kind of document data you would like to convert your attributed string to:

NSPlainTextDocumentType   // Plain text document. .txt document
NSHTMLTextDocumentType    // Hypertext Markup Language .html document.
NSRTFTextDocumentType     // Rich text format document. .rtf document.
NSRTFDTextDocumentType    // Rich text format document with attachment. (.rtfd) document.

update Xcode 10.2 • Swift 5

let textView = UITextView()
let attributes: [NSAttributedString.Key: Any] = [.font: UIFont(name: "Helvetica", size: 16)!]
textView.attributedText = NSAttributedString(string: "abc", attributes: attributes)
if let attributedText = textView.attributedText {
    let documentAttributes: [NSAttributedString.DocumentAttributeKey: Any] = [.documentType: NSAttributedString.DocumentType.html]
    do {
        let htmlData = try attributedText.data(from: NSRange(location: 0, length: attributedText.length), documentAttributes: documentAttributes)
        let htmlString = String(data: htmlData, encoding: .utf8) ?? ""
        print(htmlString)
    } catch {
        print(error)
    }
}

This will print

/* <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta http-equiv="Content-Style-Type" content="text/css">
<title></title>
<meta name="Generator" content="Cocoa HTML Writer">
<style type="text/css">
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 16.0px Helvetica}
span.s1 {font-family: 'Helvetica'; font-weight: normal; font-style: normal; font-size: 16.00pt}
</style>
</head>
<body>
<p class="p1"><span class="s1">abc</span></p>
</body>
</html>
*/

来源：https://stackoverflow.com/questions/43313291/convert-nsattributedstring-into-data-for-storage

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ios

swift

nsdata

nsattributedstring