将NSAttributedString转换为Data进行存储 [英] Convert NSAttributedString into Data for storage
本文介绍了将NSAttributedString转换为Data进行存储的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有 UITextView ，带有属性文本， allowsEditingTextAttributes 设置为 true 。
I have a UITextView with attributed text and allowsEditingTextAttributes set to true.
我正在尝试使用以下代码将属性字符串转换为Data对象：
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: [:])
然而，这会引发以下错误：
However, this is throwing the following error:
Error Domain=NSCocoaErrorDomain Code=66062 "(null)"
任何想法这个错误意味着什么或可能导致什么？我正在使用最新的Xcode和iOS。谢谢。
Any ideas what this error means or what could cause this? I'm on the latest Xcode and iOS. Thanks.
推荐答案
您需要指定要将属性字符串转换为哪种文档数据：
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.
Xcode 8.3.2•Swift 3.1
let textView = UITextView()
textView.attributedText = NSAttributedString(string: "abc", attributes: [NSFontAttributeName: UIFont(name: "Helvetica", size: 16)])
if let attributedText = textView.attributedText {
do {
let htmlData = try attributedText.data(from: NSRange(location: 0, length: attributedText.length), documentAttributes: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType])
let htmlString = String(data: htmlData, encoding: .utf8) ?? ""
} catch {
print(error)
}
}
更新Xcode 9.0.1•Swift 4
let textView = UITextView()
let attributes: [NSAttributedStringKey: 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)
}
}
这将打印
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>
*/
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