在Swift 4中将属性文本转换为HTML

时间:2018-05-02 01:51:23

标签: html ios swift nsattributedstring

我正在尝试将属性文本转换为Swift 4中的HTML,以便它可以存储在Firebase / Firestore中并在不同的设备/平台上同步。我已阅读Stackoverflow上可以找到的每篇文章,包括Convert attributed string, to, "simple" tagged htmlConvert attributed text to HTML和此博客文章:http://sketchytech.blogspot.com/2016/02/swift-from-html-to-nsattributedtext-and.html。我发现Swift 4.x在各种代码示例中抛出了NSDocumentTypeDocumentAttribute和NSHTMLTextDocumentType的未解析标识符错误(例如下面的例子)。 Swift 3.x中没有抛出这些错误。 Xcode建议我可能意味着使用NSDocumentTypeDocumentOption但不提供修复,我不确定这是否是我想要的或如果它是如何使用它。

let myAttributes = [ NSAttributedStringKey.foregroundColor: UIColor.green ]
let attrString = NSAttributedString(string: "Hello.", attributes: myAttributes)
let x = attrString
var resultHtmlText = ""
do {

    let r = NSRange(location: 0, length: x.length)
    let att = [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType]

    let d = try x.data(from: r, documentAttributes: att)

    if let h = String(data: d, encoding: .utf8) {
        resultHtmlText = h
    }
}
catch {
    print("utterly failed to convert to html!!! \n>\(x)<\n")
}
print(resultHtmlText)

感谢您的帮助

1 个答案:

答案 0 :(得分:7)

对于Swift 4.x,行:

let att = [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType]

应该是:

let att = [NSAttributedString.DocumentAttributeKey.documentType: NSAttributedString.DocumentType.html]