从 NSMutableAttributedString 中删除项目符号点

Question

我正在尝试从 NSMutableAttributedString 中删除 • 项目符号。

我可以使用 .replacingOccurrences(of: text, with: "") 删除文本 "Click to open image ..."，但无论我做什么，要点都不会消失。无论如何，我认为这不是正确的解决方案。

我在标签的 attributedText 上调用下面的扩展例如：

label.attributedText = someString.htmlAttributedString()

有什么建议吗？

extension String {

    func htmlAttributedString() -> NSMutableAttributedString {
        guard let data = self.data(using: String.Encoding.utf8, allowLossyConversion: false) else { return NSMutableAttributedString() }

        guard let formattedString =
            try? NSMutableAttributedString(
                data: data,
                options: [
                    .documentType: NSAttributedString.DocumentType.html,
                    .characterEncoding: String.Encoding.utf8.rawValue],

                documentAttributes: nil)
            else { return NSMutableAttributedString() }

        let bulletPoint: String = "\u{2022}"
        let attributedString = NSMutableAttributedString(string: bulletPoint)
        formattedString.enumerateAttributes(in: NSRange(0..<attributedString.length), options: []) { (attributes, range, _) -> Void in
            for (attribute, _) in attributes {
                formattedString.removeAttribute(attribute, range: range)
            }
        }

        formattedString.trimCharactersInSet(charSet: NSCharacterSet.whitespacesAndNewlines as NSCharacterSet)

        return formattedString
    }
}

html 字符串如下所示：

{
    NSColor = "kCGColorSpaceModelRGB 0 0 0 1 ";
    NSFont = "<UICTFont: 0x7fb06e91edb0> font-family: \"Times New Roman\"; font-weight: normal; font-style: normal; font-size: 12.00pt";
    NSKern = 0;
    NSParagraphStyle = "Alignment 3, LineSpacing 0, ParagraphSpacing 12, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 15/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n), DefaultTabInterval 36, Blocks (\n), Lists (\n), BaseWritingDirection 0, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
    NSStrokeColor = "kCGColorSpaceModelRGB 0 0 0 1 ";
    NSStrokeWidth = 0;
}   •   {
    NSColor = "kCGColorSpaceModelRGB 0 0 0.933333 1 ";
    NSFont = "<UICTFont: 0x7fb06e93e600> font-family: \"TimesNewRomanPS-BoldMT\"; font-weight: bold; font-style: normal; font-size: 12.00pt";
    NSParagraphStyle = "Alignment 0, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 36, TailIndent 0, FirstLineHeadIndent 0, LineHeight 15/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n    11L,\n    36N\n), DefaultTabInterval 36, Blocks (null), Lists (\n    \"NSTextList 0x60c000442160 format <{disc}>\"\n), BaseWritingDirection 0, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
}Click to open image!{
    NSColor = "kCGColorSpaceModelRGB 0 0 0.933333 1 ";
    NSFont = "<UICTFont: 0x7fb06e93e600> font-family: \"TimesNewRomanPS-BoldMT\"; font-weight: bold; font-style: normal; font-size: 12.00pt";
    NSKern = 0;
    NSLink = "applewebdata://AC01F520-17C4-4F1A-BB81-0A54CBE9C2F6/images/galerie/fotoreportaj-faleza-inferioara-galati/01.jpg";
    NSParagraphStyle = "Alignment 0, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 36, TailIndent 0, FirstLineHeadIndent 0, LineHeight 15/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n    11L,\n    36N\n), DefaultTabInterval 36, Blocks (null), Lists (\n    \"NSTextList 0x60c000442160 format <{disc}>\"\n), BaseWritingDirection 0, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
    NSStrokeColor = "kCGColorSpaceModelRGB 0 0 0.933333 1 ";
    NSStrokeWidth = 0;
    NSUnderline = 1;
} Mareste imaginea {
    NSColor = "kCGColorSpaceModelRGB 0 0 0.933333 1 ";
    NSFont = "<UICTFont: 0x7fb06e91edb0> font-family: \"Times New Roman\"; font-weight: normal; font-style: normal; font-size: 12.00pt";
    NSKern = 0;
    NSLink = "applewebdata://AC01F520-17C4-4F1A-BB81-0A54CBE9C2F6/images/galerie/fotoreportaj-faleza-inferioara-galati/01.jpg";
    NSParagraphStyle = "Alignment 0, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 36, TailIndent 0, FirstLineHeadIndent 0, LineHeight 15/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n    11L,\n    36N\n), DefaultTabInterval 36, Blocks (null), Lists (\n    \"NSTextList 0x60c000442160 format <{disc}>\"\n), BaseWritingDirection 0, HyphenationFactor 0, TighteningForTruncation NO, HeaderLevel 0";
    NSStrokeColor = "kCGColorSpaceModelRGB 0 0 0.933333 1 ";
    NSStrokeWidth = 0;
    NSUnderline = 1;
}

这是

的样子

.replacingOccurrences(of: "•", with: "")

.replacingOccurrences(of: "Click to open image!", with: "")

.replacingOccurrences(of: "Mareste imaginea", with: "")

Answer 1

在您当前的代码中，我完全不知道它应该做什么：

let bulletPoint: String = "\u{2022}"
let attributedString = NSMutableAttributedString(string: bulletPoint)
formattedString.enumerateAttributes(in: NSRange(0..<attributedString.length), options: []) { (attributes, range, _) -> Void in
    for (attribute, _) in attributes {
        formattedString.removeAttribute(attribute, range: range)
    }
}

如果 formattedString 比 attributedString 短，您使用 NSRange(0..<attributedString.length) 应该会导致崩溃。这是一个要点，所以你不应该有这个问题，但仍然如此。而它背后的目标却超出了我的范围。

子弹 • 或 \u{2022} 是在解析后创建的，所以你需要解析 formattedString.string，你可以做什么：

let regex = try! NSRegularExpression(pattern: "\s\u{2022}\s", options: [])
let matches = regex.matches(in: formattedString.string, options: [], range: NSMakeRange(0, formattedString.string.utf16.count))
matches.reversed().forEach { formattedString.replaceCharacters(in: [=11=].range, with: "")}

我不明白你是想只删除项目符号还是文本的其余部分（其他人尝试使用 .replacingOccurrences(of: "Click to open image!", with: "") 只是为了看看你确实能够到达那一行并删除子串与否。

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