表格中的杂散垂直线

Question

对于以下 MWE：

\documentclass{beamer}
\usetheme{metropolis}
\setbeamertemplate{footline}{}
\makeatletter
\def\beamer@framenotesbegin{% at beginning of slide
\usebeamercolor[fg]{normal text}
\gdef\beamer@noteitems{}%
\gdef\beamer@notes{}%
}
\makeatother
\usepackage{lmodern}
\usepackage{tcolorbox}
\usepackage[USenglish]{babel}
\usepackage[latin1]{inputenc}
\usepackage{bigdelim}
\setbeamersize{text margin left=10mm,text margin right=10mm} 
\setbeamerfont{frametitle}{size=\small}
\begin{document}
\maketitle

\begin{frame}{Spectral Properties}
\resizebox{\textwidth}{!}{%
\begin{tabular}{r@{\,}|c|c|}
\cline{2-3}
& \textbf{Column 1}\footnotemark[1] & \textbf{Column 2}\footnotemark[2]\\
\cline{2-3} \cline{2-3}
\color{green}\ldelim\{{3}{*}[\color{red} Info]&
Some Text & Some Text\\ \cline{2-3}
\onslide<2->{&Some Text  & Some Text\\ \cline{2-3}}
\onslide<3->{&Some Text & Some Text \\ \cline{2-3}}
\end{tabular}
}
\end{frame}
\end{document}

我得到输出：

所有框架中的杂散垂直线是干什么的？我该如何去除它？

Answer 1

以下是实现此目的的众多方法之一。（见这里以及其链接帖子中先前的讨论。）编辑：为了避免跳跃，可以[t]向框架添加选项。

\documentclass{beamer}
\usetheme{metropolis}
\setbeamertemplate{footline}{}
\makeatletter
\def\beamer@framenotesbegin{% at beginning of slide
\usebeamercolor[fg]{normal text}
\gdef\beamer@noteitems{}%
\gdef\beamer@notes{}%
}
\makeatother
\usepackage{lmodern}
\usepackage{tcolorbox}
\usepackage[USenglish]{babel}
\usepackage[latin1]{inputenc}
\usepackage{bigdelim}
\setbeamersize{text margin left=10mm,text margin right=10mm} 
\setbeamerfont{frametitle}{size=\small}
\begin{document}
\maketitle

\begin{frame}[t]
\frametitle{Spectral Properties}
\resizebox{\textwidth}{!}{%
\begin{tabular}{r@{\,}|c|c|}
\cline{2-3}
& \textbf{Column 1}\footnotemark[1] & \textbf{Column 2}\footnotemark[2]\\
\cline{2-3} \cline{2-3}
\color{green}\ldelim\{{3}{*}[\color{red} Info]&
Some Text & Some Text 
\only<2->{\\ \cline{2-3} &Some Text  & Some Text}
\only<3->{\\ \cline{2-3} &Some Text & Some Text}
\\ \cline{2-3}
\end{tabular}
}
\end{frame}
\end{document}

另一个技巧是将有问题的线变成白色。

\documentclass{beamer}
\usetheme{metropolis}
\setbeamertemplate{footline}{}
\usepackage{colortbl}
\makeatletter
\def\beamer@framenotesbegin{% at beginning of slide
\usebeamercolor[fg]{normal text}
\gdef\beamer@noteitems{}%
\gdef\beamer@notes{}%
}
\makeatother
\usepackage{lmodern}
\usepackage{tcolorbox}
\usepackage[USenglish]{babel}
\usepackage[latin1]{inputenc}
\usepackage{bigdelim}
\setbeamersize{text margin left=10mm,text margin right=10mm} 
\setbeamerfont{frametitle}{size=\small}
\begin{document}
\maketitle

\begin{frame}
\frametitle{Spectral Properties}
\resizebox{\textwidth}{!}{%
\begin{tabular}{r@{\,}|c|c|}
\cline{2-3}
& \textbf{Column 1}\footnotemark[1] & \textbf{Column 2}\footnotemark[2]\\
\cline{2-3} \cline{2-3}
\color{green}\ldelim\{{3}{*}[\color{red} Info]&
Some Text & Some Text\\ \cline{2-3}
\onslide<2->{&Some Text  & Some Text\\ \cline{2-3}}
\onslide<3->{&Some Text & Some Text \\ \cline{2-3}\arrayrulecolor{white}}
\end{tabular}
}
\end{frame}
\end{document}