垂直对齐（居中）不起作用（多行、长表、书页标签）

Question

我遇到了一个无法解决的问题，即使在网上搜索之后也是如此，我很抱歉，因为我对 Latex 还很陌生，而且这基本上是我的第一个表（需要跨越多页）。

如您所见，组 1 和所有区域均未垂直居中。此外，“表格末尾”注释也未正确水平居中。我尝试应用我找到的解决方案，但均无效 - 我相信我在这里做错了什么...

代码：

\documentclass{article}

\usepackage{longtable}
\usepackage{booktabs}
\usepackage{multirow}
\usepackage{pdflscape}
 
\begin{document}
\begin{landscape}
\begin{longtable}{p{5cm} @{}l p{10cm}}
\toprule
Risk Category & Zone & Description \\
\midrule
\endfirsthead

% Longtable rules for subsequent pages
\multicolumn{3}{c}%
{{\tablename\ \thetable{} -- Continued from previous page}} \\
\toprule 
Risk Category & Zone & Description \\
\midrule
\endhead

% Footer for all pages except last page.
\midrule
\multicolumn{3}{r}{{Continued on next page}} \\
\endfoot

% Footer forthe  last page
\bottomrule
\multicolumn{3}{r}{{End of table.}} \\
\endlastfoot

\multirow{2}{*}{Group 1} & Zone A of Group 1 & This is a fairly long sentence that will cause multiple line breaks in the document therefore creating many rows in this column. \\
\cmidrule{2-3}

& Zone B of Group 1 & This is a fairly long sentence that will cause multiple line breaks in the document therefore creating many rows in this column.\\
\midrule

& Zone C & This is a fairly long sentence that will cause multiple line breaks in the document therefore creating many rows in this column. \\ 
\midrule

& Zone D & This is a fairly long sentence that will cause multiple line breaks in the document therefore creating many rows in this column. \\ 


\end{longtable}
\end{landscape}
\end{document}

Answer 1

作为对 @cabohah 的精彩回答 (+1) 的补充，但使用了tabularray包。使用其longtblr表格，代码更清晰、更简洁（更短）。表格（在我看来）具有更吸引人的外观：

包的语法tabularray与其他（经典）表略有不同。例如，它定义和而不是\multirow和环境。有关更多详细信息，您需要阅读包文档。它包含许多示例。multicolumn\SetCell[r=<num of rows>]{<style} <content>\SetCell[c=<num of columns>]{<style} <content>

\documentclass{article}

\usepackage{xcolor}
\usepackage{tabularray}
\UseTblrLibrary{booktabs}

\usepackage{pdflscape}

\begin{document}
    \begin{landscape}
\begin{longtblr}[
caption = {does your table has a caption?},
  label = {tab:long}
                ]{colspec = {*{2}{Q[l]} X[l,m]},
                  cell{2}{1} = {r=2}{},  
                  rowhead = 1,
                  }
\toprule
Risk Category   & Zone      & Description \\
\midrule
\SetCell[r=2]{}     Group 1
                & Zone A of Group 1 
                            & This is a fairly long sentence that will cause multiple line breaks in the document therefore creating many rows in this column. \\
\midrule
                & Zone B of Group 1 
                            & This is a fairly long sentence that will cause multiple line breaks in the document therefore creating many rows in this column.\\
\midrule
                & Zone C    & This is a fairly long sentence that will cause multiple line breaks in the document therefore creating many rows in this column. \\
\midrule
                & Zone D    & This is a fairly long sentence that will cause multiple line breaks in the document therefore creating many rows in this column. \\
\midrule[\heavyrulewidth]
\SetCell[c=3]{r}    End of table.           \\
    \end{longtblr}
\end{landscape}
\end{document}

Answer 2

的第一个强制参数\multirow是行数。您的表格有多行表格行，并且还使用booktab行。因此该值2太低。增加数字可以帮助改善垂直居中。

要垂直居中“区域”单元格，我建议使用m-columns 而不是p-columns。它们垂直居中到行的基线。m-columns 需要包array。

例子：

\documentclass{article}

\usepackage{array}
\usepackage{longtable}
\usepackage{booktabs}
\usepackage{multirow}
\usepackage{pdflscape}
 
\begin{document}
\begin{landscape}
\begin{longtable}{m{5cm} @{}l m{10cm}}
\toprule
Risk Category & Zone & Description \\
\midrule
\endfirsthead

% Longtable rules for subsequent pages
\multicolumn{3}{c}%
{{\tablename\ \thetable{} -- Continued from previous page}} \\
\toprule 
Risk Category & Zone & Description \\
\midrule
\endhead

% Footer for all pages except last page.
\midrule
\multicolumn{3}{r}{{Continued on next page}} \\
\endfoot

% Footer forthe  last page
\midrule[\heavyrulewidth]
\multicolumn{3}{r}{{End of table.}} \\
\endlastfoot

\multirow[c]{3}{*}{Group 1} & Zone A of Group 1 & This is a fairly long sentence that will cause multiple line breaks in the document therefore creating many rows in this column. \\
\cmidrule{2-3}

& Zone B of Group 1 & This is a fairly long sentence that will cause multiple line breaks in the document therefore creating many rows in this column.\\
\midrule

& Zone C & This is a fairly long sentence that will cause multiple line breaks in the document therefore creating many rows in this column. \\ 
\midrule

& Zone D & This is a fairly long sentence that will cause multiple line breaks in the document therefore creating many rows in this column. \\ 


\end{longtable}
\end{landscape}
\end{document}

顺便说一句：对于第一列，我认为l会更好。例如，使用包xltabular可以自动检测最后一列的宽度：

\documentclass{article}

\usepackage{xltabular}
\usepackage{booktabs}
\usepackage{multirow}
\usepackage{pdflscape}
 
\begin{document}
\begin{landscape}
  \renewcommand*{\tabularxcolumn}[1]{m{#1}}
  \begin{xltabular}{\linewidth}{llX}
\toprule
Risk Category & Zone & Description \\
\midrule
\endfirsthead

% Longtable rules for subsequent pages
\multicolumn{3}{c}%
{{\tablename\ \thetable{} -- Continued from previous page}} \\
\toprule 
Risk Category & Zone & Description \\
\midrule
\endhead

% Footer for all pages except last page.
\midrule
\multicolumn{3}{r}{{Continued on next page}} \\
\endfoot

% Footer forthe  last page
\midrule[\heavyrulewidth]
\multicolumn{3}{r}{{End of table.}} \\
\endlastfoot

\multirow[c]{3}{*}{Group 1} & Zone A of Group 1 & This is a fairly long sentence that will cause multiple line breaks in the document therefore creating many rows in this column. \\
\cmidrule{2-3}

& Zone B of Group 1 & This is a fairly long sentence that will cause multiple line breaks in the document therefore creating many rows in this column.\\
\midrule

& Zone C & This is a fairly long sentence that will cause multiple line breaks in the document therefore creating many rows in this column. \\ 
\midrule

& Zone D & This is a fairly long sentence that will cause multiple line breaks in the document therefore creating many rows in this column. \\ 


\end{xltabular}
\end{landscape}
\end{document}

注意：我没有水平居中“表格末尾”，因为您似乎已经发现，您必须使用\multicolumn{3}来跨越所有三列。但是，如果您不想让文本居中右对齐，则需要\multicolumn{3}{c}{{End of table.}}。