SwiftRichString：段落前后的间距在NSAttributedString中不起作用

Question

这里是我的所有样式：

    let normal = Style {
        $0.font = UIFont.openSans(ofSize: 16)
    }
    let bold = normal.byAdding {
        $0.traitVariants = .bold
    }
    let italic = normal.byAdding {
        $0.traitVariants = .italic
    }
    let div = normal.byAdding {
        let style = NSMutableParagraphStyle()
        style.paragraphSpacingBefore = 130
        $0.paragraph = style
        $0.backColor = UIColor.red
    }
    let paragraph = Style {
        let style = NSMutableParagraphStyle()
        $0.paragraphSpacingBefore = 30
        $0.paragraphSpacingAfter = 30
        $0.paragraph = style
        $0.backColor = UIColor.green
    }
    let ul = Style {
        $0.paragraphSpacingBefore = 30
        $0.paragraphSpacingAfter = 30
        $0.tailIndent = 50
        $0.backColor = UIColor.yellow
    }
    let li = Style {
        $0.backColor = UIColor.blue
    }

    text.set(style: StyleGroup(base: normal, ["b": bold, "i": italic, "p": paragraph, "ul": ul, "li": li, "div": div]))

我需要在段落之间留一个间距。它们应该像div和html一样工作-换行和换行；）