重新定义 beamer 中的信息线

Question

我正在用 Beamer 做我的第一个演示。我使用的是 CambridgeUS 主题，我想重新定义信息行，以便展示

• 标题上的演示文稿的标题
• 脚注上的作者、机构、日期和计数器

我写了下面的代码

\makeatletter
\setbeamertemplate{headline}{
\leavevmode%
\hbox{%
\begin{beamercolorbox}[wd=\paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%
    \usebeamerfont{section in head/foot}\insertshorttitle\hspace*{2ex}
\end{beamercolorbox}%
}
\makeatother

\makeatletter
\setbeamertemplate{footline}{
\leavevmode%
\hbox{%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%
    \usebeamerfont{title in head/foot}\insertshortauthor
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}%
    \usebeamerfont{title in head/foot}\insertshortinstitute
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,right]{date in head/foot}%
    \usebeamerfont{date in head/foot}\insertshortdate{}\hspace*{2em}
    \insertframenumber{} / \inserttotalframenumber\hspace*{2ex} 
\end{beamercolorbox}}%
\vskip0pt%
}
\makeatother

但我收到以下错误

扫描使用 \beamer@sbtexec 时文件结束

我认为错误在于headline的定义。事实上，如果我写了下面的代码

\makeatletter
\setbeamertemplate{headline}{
\leavevmode%
\hbox{%
\begin{beamercolorbox}[wd=\paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%
    \usebeamerfont{section in head/foot}\insertshorttitle\hspace*{2ex}
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}%
    \usebeamerfont{title in head/foot}\insertshortinstitute
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,right]{date in head/foot}%
    \usebeamerfont{date in head/foot}\insertshortdate{}\hspace*{2em}
    \insertframenumber{} / \inserttotalframenumber\hspace*{2ex} 
\end{beamercolorbox}}%
\vskip0pt%
}
\makeatother

一切正常，但我不得不定义两个无用的 beamercolorbox。错误在哪里？

另外，我想隐藏演示文稿第一帧的标题。

我能怎么做？

Answer 1

您在定义中缺少最后的右括号headline：

\documentclass{beamer}
\usetheme{CambridgeUS}

\makeatletter
\setbeamertemplate{headline}{
\leavevmode%
\hbox{%
\begin{beamercolorbox}[wd=\paperwidth,ht=2.75ex,dp=1ex,center]{author in head/foot}%
    \usebeamerfont{section in head/foot}\insertshorttitle\hspace*{2ex}
\end{beamercolorbox}}% <- this closing brace was missing
}

\setbeamertemplate{footline}{
\leavevmode%
\hbox{%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%
    \usebeamerfont{title in head/foot}\insertshortauthor
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}%
    \usebeamerfont{title in head/foot}\insertshortinstitute
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,right]{date in head/foot}%
    \usebeamerfont{date in head/foot}\insertshortdate{}\hspace*{2em}
    \insertframenumber{} / \inserttotalframenumber\hspace*{2ex} 
\end{beamercolorbox}}%
\vskip0pt%
}
\makeatother

\author{The Author}
\title{The Title}
\institute{The Institute}

\begin{document}

\begin{frame}
test
\end{frame}

\end{document}

我擅自稍微增加了标题框的高度（当然，这只是一个建议，您可以恢复到原来的设置）。

为了抑制headline 和 footline，使用;plain选项frame仅抑制一个模板，在本地将其重新定义为空：

\documentclass{beamer}
\usetheme{CambridgeUS}

\makeatletter
\setbeamertemplate{headline}{
\leavevmode%
\hbox{%
\begin{beamercolorbox}[wd=\paperwidth,ht=2.75ex,dp=1ex,center]{author in head/foot}%
    \usebeamerfont{section in head/foot}\insertshorttitle\hspace*{2ex}
\end{beamercolorbox}}%
}

\setbeamertemplate{footline}{
\leavevmode%
\hbox{%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%
    \usebeamerfont{title in head/foot}\insertshortauthor
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}%
    \usebeamerfont{title in head/foot}\insertshortinstitute
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,right]{date in head/foot}%
    \usebeamerfont{date in head/foot}\insertshortdate{}\hspace*{2em}
    \insertframenumber{} / \inserttotalframenumber\hspace*{2ex} 
\end{beamercolorbox}}%
\vskip0pt%
}
\makeatother

\author{The Author}
\title{The Title}
\institute{The Institute}

\begin{document}

\begin{frame}[plain]
test
\end{frame}

\begingroup
\setbeamertemplate{headline}{}
\begin{frame}
test
\end{frame}
\endgroup

\begingroup
\setbeamertemplate{footline}{}
\begin{frame}
test
\end{frame}
\endgroup

\begin{frame}
test
\end{frame}

\end{document}