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测试现有宏不起作用

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测试现有宏不起作用

一旦定义，我不希望\Stepx重新定义宏：

\documentclass[xcolor=dvipsnames,professionalfont,french]{beamer}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{fourier,tikz,ifthen}
\usetikzlibrary{calc} 
\usepackage[french]{babel}

\usetheme{Madrid}               % thème
\setbeamertemplate{footline}{}

\setbeamercolor{palette primary}{fg=white, bg=MidnightBlue!90}
\setbeamercolor{background canvas}{bg=MidnightBlue!15}

\setbeamersize{text margin left=1 mm}
\setbeamersize{text margin right=1 mm}

\beamertemplatenavigationsymbolsempty

\makeatletter
\def\c@slideinframe{\beamer@slideinframe}
\def\beamerslideinframe{\beamer@slideinframe}
\makeatother

\newcommand{\MyLabel}[1]{%
\ifcsname Step#1\endcsname%
\else%
    \expandafter\gdef\csname Step#1\endcsname{\arabic{slideinframe}}%
\fi%
}


\begin{document}
\begin{frame}[label=bob]{Title}
\begin{enumerate}[<+->]
\item \only<.>{\MyLabel{a}}\arabic{slideinframe}

    \Stepa

\item \begin{itemize}[<+->]
    \item
    \item 
    \end{itemize}

\end{enumerate}
\end{frame}
\end{document}

答案1

我建议使用 中的命令etoolbox。特别是，这里有\ifcsdef和 ，\csxdef可用作。请注意，您需要xdef在定义命令时扩展定义。版本gdef只会将命令设置为\arabic{slideinframe}随每个帧而变化的命令。

\usepackage{etoolbox}
\newcommand{\MyLabel}[1]{%
\ifcsdef{Step#1}{}{\csgdef{Step#1}{\arabic{slideinframe}}}}

您完成的文档是：

\documentclass[xcolor=dvipsnames,professionalfont,french]{beamer}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{fourier,tikz,ifthen}
\usetikzlibrary{calc} 
\usepackage[french]{babel}
\usepackage{etoolbox}

\usetheme{Madrid}               % thème
\setbeamertemplate{footline}{}

\setbeamercolor{palette primary}{fg=white, bg=MidnightBlue!90}
\setbeamercolor{background canvas}{bg=MidnightBlue!15}

\setbeamersize{text margin left=1 mm}
\setbeamersize{text margin right=1 mm}

\beamertemplatenavigationsymbolsempty

\makeatletter
\def\c@slideinframe{\beamer@slideinframe}
\def\beamerslideinframe{\beamer@slideinframe}
\makeatother

\newcommand{\MyLabel}[1]{%
\ifcsdef{Step#1}{}{\csxdef{Step#1}{\arabic{slideinframe}}}}


\begin{document}
\begin{frame}[label=bob]{Title}
\begin{enumerate}[<+->]
\item \only<.>{\MyLabel{a}}\arabic{slideinframe}

    \Stepa

\item \begin{itemize}[<+->]
    \item
    \item 
    \end{itemize}

\end{enumerate}
\end{frame}
\end{document}

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