Ios 对TextView的HTML解析（Swift 4版）

HtmlString=

作为aaa

我有一个字符串扩展，它将字符串（html）解析为NSAttributedString

在swift 3上：

guard let data = self.data(using: String.Encoding.utf16, allowLossyConversion: false) else { return nil }

guard let htmlString = try? NSMutableAttributedString(
    data: data,
    options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],
    documentAttributes: nil) else { return nil }

let fullRange = NSRange(location: 0, length: htmlString.length);
    htmlString.enumerateAttribute(NSFontAttributeName, in: fullRange, options: NSAttributedString.EnumerationOptions.longestEffectiveRangeNotRequired, using: {
        (attributes, range, stop) -> Void in

        let newFont = UIFont.preferredFont(fontName: FontName.kHelveticaNeueLight, fontSize: FontSize.kTextView);
        htmlString.addAttribute(NSFontAttributeName, value: newFont, range: range);
    });

    htmlString.addAttribute(NSForegroundColorAttributeName, value:Color.kGrayDark, range:fullRange)

return htmlString;

在swift 4上：

    guard let data = self.data(using: String.Encoding.utf16, allowLossyConversion: false) else { return nil }
    guard let htmlString = try? NSMutableAttributedString(
        data: data,
        options: [NSAttributedString.DocumentReadingOptionKey.documentType: NSAttributedString.DocumentType.html],
        documentAttributes: nil) else { return nil }
    let fullRange = NSRange(location: 0, length: htmlString.length);

    htmlString.enumerateAttribute(NSAttributedStringKey.font, in: fullRange, options: NSAttributedString.EnumerationOptions.longestEffectiveRangeNotRequired, using: {
        (attributes, range, stop) -> Void in
        let newFont = UIFont(name: FontName.regular.value, size: FontSize.html)
        htmlString.addAttribute(NSAttributedStringKey.font, value: newFont ?? UIFont.systemFont(ofSize: FontSize.html), range: range);
    });

    htmlString.addAttribute(NSAttributedStringKey.foregroundColor, value:UIColor.html(), range:fullRange)
    return htmlString;

Swift 3结果：

Swift 4结果：

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我错过了斯威夫特4号的边界。有什么建议吗？

错误是因为我将标签用于AttributeText，而不是TextView。它与textView配合使用效果很好

如果辅助功能字体不同于默认字体，则html中UILabel AttributeString的大小调整将很有趣。在ios 11.2上测试，您将发现它们