Xcode HTML to String返回nil？ - SWIFT 3

Question

public func setHtmlBody(_ body: String, bounds: CGRect = UIScreen.main.bounds) -> String {

    let font = "-apple-system"
    let fontSize = 19
    let fontColor = "#000000"
    let lineHeight = 25
    let imageWidth = bounds.width - 40
    let margin = 20
    let codeStyle = "pre[class*=\"language-\"]{background:white;border-radius:14px;color:black;display:block;font-size:16px;font-weight:500;padding:20px;overflow-x:auto;white-space:pre-wrap;line-height:130%;}pre.language-coffeescript .token.comment{color:#6a7576}pre.language-coffeescript .token.string{color:#8ADC64}pre.language-coffeescript .token.number,pre.language-coffeescript .token.operator{color:#a580f8}pre.language-coffeescript .token.keyword,pre.language-coffeescript .token.class-name,pre.language-coffeescript .token.function{color:#8df}pre.language-swift .token.comment{color:#690}pre.language-swift .token.string{color:#ee433f}pre.language-swift .token.keyword{color:#C945A7}pre.language-swift .token.number,pre.language-swift .token.function,pre.language-swift .token.builtin,pre.language-swift .token.class-name{color:#5C2699}"

    let htmlString = "<style>p, li { font-family:\"\(font)\"; color: \(fontColor); font-size:\(fontSize)px; line-height:\(lineHeight)px } p { margin: \(margin)px 0; } img { max-width: \(imageWidth)px; } #p { font-weight: bold; font-size: 24px; line-height: 130%; margin: 50px 20px; } ul li, ol li { margin: 20px 0; font-weight: bold; } \(codeStyle)</style>\(body)"

    return htmlString
}

我正在使用swift 3.为什么函数会将我返回Nil？

Usign：

bodyAttributedString = setHtmlBody(sectionBody).htmlToAttributedString

Answer 1

问题是htmlToAttributedString功能所有其他工作正常。我用类似的方法尝试了它，它完美地形成了我

请检查......

扩展程序将html作为归属字符串

extension Data {
    var htmlToAttributedString: NSAttributedString? {
        do {
            return try NSAttributedString(data: self, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue], documentAttributes: nil)
        } catch {
            print("error:", error)
            return  nil
        }
    }
    var html2String: String {
        return htmlToAttributedString?.string ?? ""
    }
}

extension String {
    var htmlToAttributedString: NSAttributedString? {
        return Data(utf8).htmlToAttributedString
    }
    var html2String: String {
        return htmlToAttributedString?.string ?? ""
    }
}

HTML字符串构建函数

public func setHtmlBody(_ body: String, bounds: CGRect = UIScreen.main.bounds) -> String {

    let font = "-apple-system"
    let fontSize = 19
    let fontColor = "#000000"
    let lineHeight = 25
    let imageWidth = bounds.width - 40
    let margin = 20
    let codeStyle = "pre[class*=\"language-\"]{background:white;border-radius:14px;color:black;display:block;font-size:16px;font-weight:500;padding:20px;overflow-x:auto;white-space:pre-wrap;line-height:130%;}pre.language-coffeescript .token.comment{color:#6a7576}pre.language-coffeescript .token.string{color:#8ADC64}pre.language-coffeescript .token.number,pre.language-coffeescript .token.operator{color:#a580f8}pre.language-coffeescript .token.keyword,pre.language-coffeescript .token.class-name,pre.language-coffeescript .token.function{color:#8df}pre.language-swift .token.comment{color:#690}pre.language-swift .token.string{color:#ee433f}pre.language-swift .token.keyword{color:#C945A7}pre.language-swift .token.number,pre.language-swift .token.function,pre.language-swift .token.builtin,pre.language-swift .token.class-name{color:#5C2699}"

    let htmlString = "<style>p, li { font-family:\"\(font)\"; color: \(fontColor); font-size:\(fontSize)px; line-height:\(lineHeight)px } p { margin: \(margin)px 0; } img { max-width: \(imageWidth)px; } #p { font-weight: bold; font-size: 24px; line-height: 130%; margin: 50px 20px; } ul li, ol li { margin: 20px 0; font-weight: bold; } \(codeStyle)</style>\(body)"
    return htmlString
}

<强>演示

override func viewDidLoad() {
    super.viewDidLoad()

    let body = "<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>"

    let htmlString = setHtmlBody(body)


    if let attributedString = htmlString.htmlToAttributedString {
        self.labelHTML.attributedText = attributedString
    }
 }

<强>输出