当我在表格单元格内完成换行时，垂直线消失了或没有显示

Question

我根据以下引用编写了以下代码这个帖子。

\documentclass[border=0.1cm]{article}

\usepackage{diagbox}
\usepackage{makecell}

\begin{document}
    
      \begin{table}\centering\setlength\tabcolsep{3.5pt}\renewcommand\arraystretch{1.25}
          \noindent\makebox[\textwidth]{%
            \begin{tabular}{|l|*{3}{c|}}
              \hline
              \diagbox[width=\dimexpr \textwidth/8+2\tabcolsep\relax, height=1cm,width=3cm]{ row  }{column }
             & smth1 & smth2 \\
              \hline
              smth3   & 1 & 2  \\  
              \hline
              smth4& 3 & 4 \\
              \hline
            \end{tabular}
          }
        \end{table}        

\end{document}

从上面的代码中得到下面的图像。

当我在 smth3 单元格处完成换行时，出现了空白行，如下图所示。

我该如何解决这个问题？

\documentclass[border=0.1cm]{article}

\usepackage{diagbox}
\usepackage{makecell}

\begin{document}
    
      \begin{table}\centering\setlength\tabcolsep{3.5pt}\renewcommand\arraystretch{1.25}
          \noindent\makebox[\textwidth]{%
            \begin{tabular}{|l|*{3}{c|}}
              \hline
              \diagbox[width=\dimexpr \textwidth/8+2\tabcolsep\relax, height=1cm,width=3cm]{ row  }{column }
             & smth1 & smth2 \\
              \hline
              smth3 \\ text at 2nd row of smth3  & 1 & 2  \\ % Added "\\ text at 2nd row of smth3" 
              \hline
              smth4& 3 & 4 \\
              \hline
            \end{tabular}
          }
        \end{table}        

\end{document}
        
        
        

Answer 1

\documentclass[border=0.1cm]{article}

\usepackage{diagbox}
\usepackage{makecell}

\begin{document}
    
    \begin{table}\centering\setlength\tabcolsep{3.5pt}\renewcommand\arraystretch{1.25}
        \noindent\makebox[\textwidth]{%
            \begin{tabular}{|l|*{3}{c|}}
                \hline
                \diagbox[width=\dimexpr \textwidth/8+2\tabcolsep\relax, height=1cm,width=4.2cm]{ row  }{column }
                & smth1 & smth2 \\
                \hline
                \makecell[l]{smth3 \\ text at 2nd row of smth3}  & 1 & 2  \\ % Added "\\ text at 2nd row of smth3" 
                \hline
                smth4& 3 & 4 \\
                \hline
            \end{tabular}
        }
    \end{table}        
    
\end{document}

Answer 2

使用给定的多行 如何使用 \multirow

以下是完整的代码

\documentclass[border=0.1cm]{article}
\usepackage{diagbox}
\usepackage{makecell}
\usepackage{multirow}
\begin{document}
        \begin{table}\centering \setlength\tabcolsep{3.5pt}\renewcommand\arraystretch{1.25}
          \noindent\makebox[\textwidth]{%
            \begin{tabular}{|l|*{3}{c|}}
              \hline
              \diagbox[width=\dimexpr \textwidth/8+2\tabcolsep\relax, height=1cm,width=3cm]{ row  }{column }
             & smth1 & smth2 \\
              \hline
              smith3 & \multirow{ 2}{*}{1}  & \multirow{ 2}{*}{2}   \\ % Added "\\ text at 2nd row of smth3" 
              text at 2nd row of smth3 &&\\
              \hline
              smth4& 3 & 4 \\
              \hline
            \end{tabular}
          }
        \end{table}        
\end{document}