Ios NSAttributedString项目符号列表问题

我正在尝试使用

NSAttributedString

和

UITextView

创建项目符号列表。以下是我迄今为止所取得的成就：

正如人们所看到的，两条线之间有一个小的“转变”。下面是我用来构建属性字符串的代码片段：

func add(bulletList strings: [String],
         indentation: CGFloat = 15,
         lineSpacing: CGFloat = 3,
         paragraphSpacing: CGFloat = 10) {

    func createParagraphAttirbute() -> NSParagraphStyle {
        var paragraphStyle: NSMutableParagraphStyle
        let nonOptions = NSDictionary() as! [NSTextTab.OptionKey: Any]

        paragraphStyle = NSParagraphStyle.default.mutableCopy() as! NSMutableParagraphStyle
        paragraphStyle.tabStops = [
            NSTextTab(textAlignment: .left, location: indentation, options: nonOptions)]
        paragraphStyle.defaultTabInterval = indentation
        paragraphStyle.firstLineHeadIndent = 0
        paragraphStyle.lineSpacing = lineSpacing
        paragraphStyle.paragraphSpacing = paragraphSpacing
        paragraphStyle.headIndent = indentation
        return paragraphStyle
    }

    var buffer = NSMutableAttributedString.init()

    for string in strings {
        let formattedString = "\u{2022} \(string)\n"
        let attributedString = NSMutableAttributedString(string: formattedString)
        let paragraphStyle = createParagraphAttirbute()

        attributedString.addAttributes(
            [NSAttributedStringKey.paragraphStyle : paragraphStyle],
            range: NSMakeRange(0, attributedString.length))

        attributedString.addAttributes(
            textAttributes,
            range: NSMakeRange(0, attributedString.length))

        let string:NSString = NSString(string: formattedString)
        let rangeForBullet:NSRange = string.range(of: bulletPoint)
        attributedString.addAttributes(bulletAttirbutes, range: rangeForBullet)
        buffer.append(attributedString)
    }
}

您是否认为所选段落参数有问题？因为代码几乎实现了预期的功能，排除了这个差距

更新1 按照@4kman的建议，我更改了提供的代码，如下所示：

paragraphStyle.firstLineHeadIndent = indentation

但现在我把所有的线都对齐了，包括要点：

更新2

---

好的，解决方案很简单——用tab替换空格。请参阅下面的更新代码。

@4kman@Krunal，感谢您的回复！解决方案甚至更简单。在

let formattedString=“\u{2022}\（string）\n

中将空格符号替换为

\t

，可获得有效的缩进

为完整起见，完整的解决方案代码为（仅替换一个字符）：

---

下面是一个简单的Objective-C代码片段，主要基于公认的答案：

NSString* text = 
            "•\tSome text for bullet 1.\n"
            "•\tSome text for bullet 2.\n"
            "•\tSome text for bullet 3."

UIFont* bodyFont = [UIFont preferredFontForTextStyle: UIFontTextStyleBody];
CGFloat indentSize = bodyFont.pointSize;
NSMutableParagraphStyle *paraStyle = [[[NSMutableParagraphStyle alloc] init];
paraStyle.alignment = NSTextAlignmentLeft;
paraStyle.tabStops = @[ [[[NSTextTab alloc] initWithTextAlignment:NSTextAlignmentLeft location:indentSize options:@{}] ];
paraStyle.defaultTabInterval = indentSize;
paraStyle.headIndent = indentSize;
paraStyle.firstLineHeadIndent = 0;
paraStyle.lineHeightMultiple = 0.85;
paraStyle.lineSpacing = 0;
paraStyle.paragraphSpacing = bodyFont.lineHeight * 0.25;
paraStyle.paragraphSpacingBefore = 0;
[atrStr appendAttributedString:
 [[[NSMutableAttributedString alloc] initWithString:avc.message attributes:@{
      NSParagraphStyleAttributeName:paraStyle,
      NSFontAttributeName: bodyFont,
  }]];

---

请在此处提供

texttributes、bulletPoint、BulletAttributes的值，因为我在尝试代码时发现这些值无效/未知。这样我就可以查看/测试完整的代码。@Krunal感谢您的响应，已经找到了解决方案。Pl.请在此处提供完整的工作代码，添加我在注释中提到的缺失信息，以使此答案更有效非常有用。@Krunal抱歉，代码片段是从类中提取的。现在它应该可以作为一个独立的函数工作。它告诉我
缓冲区
只丢失了。你能不能也添加关于缓冲区的信息。我想这是一个字符串数组，对吗？@Krunal啊，还有很多缺少的变量和颜色。现在应该可以了。我们如何删除该项目符号列表
NSString* text = 
            "•\tSome text for bullet 1.\n"
            "•\tSome text for bullet 2.\n"
            "•\tSome text for bullet 3."

UIFont* bodyFont = [UIFont preferredFontForTextStyle: UIFontTextStyleBody];
CGFloat indentSize = bodyFont.pointSize;
NSMutableParagraphStyle *paraStyle = [[[NSMutableParagraphStyle alloc] init];
paraStyle.alignment = NSTextAlignmentLeft;
paraStyle.tabStops = @[ [[[NSTextTab alloc] initWithTextAlignment:NSTextAlignmentLeft location:indentSize options:@{}] ];
paraStyle.defaultTabInterval = indentSize;
paraStyle.headIndent = indentSize;
paraStyle.firstLineHeadIndent = 0;
paraStyle.lineHeightMultiple = 0.85;
paraStyle.lineSpacing = 0;
paraStyle.paragraphSpacing = bodyFont.lineHeight * 0.25;
paraStyle.paragraphSpacingBefore = 0;
[atrStr appendAttributedString:
 [[[NSMutableAttributedString alloc] initWithString:avc.message attributes:@{
      NSParagraphStyleAttributeName:paraStyle,
      NSFontAttributeName: bodyFont,
  }]];