Beamer：每帧底部对齐

Question

有没有办法将框架中内容的垂直对齐方式全局设置为底部对齐？换句话说，我厌倦了[b]在每个框架中添加：

\begin{frame}[b]
...
\end{frame}

我知道有类别选项c以及t居中和顶部对齐，但据我所知，没有 b 选项。

任何帮助，将不胜感激。

梅威瑟：

\documentclass{beamer}

\begin{document}
\begin{frame}[b]
This is bottom aligned.
\end{frame}

\begin{frame}
This is not\ldots
\end{frame}
\end{document}

Answer 1

您可以 像这样修改t文件中定义的键：beamerbaseframe.sty

\define@key{beamerframe}{t}[true]{% top
  \beamer@frametopskip=.2cm plus .5\paperheight\relax%
  \beamer@framebottomskip=0pt plus 1fill\relax%
  \beamer@frametopskipautobreak=\beamer@frametopskip\relax%
  \beamer@framebottomskipautobreak=\beamer@framebottomskip\relax%
  \def\beamer@initfirstlineunskip{}%
}

获得你需要的东西（底部对齐）

\define@key{beamerframe}{t}[true]{% bottom
  \beamer@frametopskip=0pt plus 1fill\relax%
  \beamer@framebottomskip=0.2cm plus .5\paperheight\relax%
  \beamer@frametopskipautobreak=\beamer@frametopskip\relax%
  \beamer@framebottomskipautobreak=\beamer@framebottomskip\relax%
  \def\beamer@initfirstlineunskip{}%
} 

你的代码变成

\documentclass{beamer}

\makeatletter
\define@key{beamerframe}{t}[true]{% bottom
  \beamer@frametopskip=0pt plus 1fill\relax%
  \beamer@framebottomskip=0.2cm plus .5\paperheight\relax%
  \beamer@frametopskipautobreak=\beamer@frametopskip\relax%
  \beamer@framebottomskipautobreak=\beamer@framebottomskip\relax%
  \def\beamer@initfirstlineunskip{}%
}
\beamer@centeredfalse
\makeatother

\begin{document}
\begin{frame}
This is bottom aligned.
\end{frame}

\begin{frame}
This is also
\end{frame}
\end{document}

更新

\documentclass[b]{beamer}

\makeatletter
\DeclareOptionBeamer{b}{\beamer@centeredfalse\define@key{beamerframe}{t}[true]{% bottom
  \beamer@frametopskip=0pt plus 1fill\relax%
  \beamer@framebottomskip=0.2cm plus .5\paperheight\relax%
  \beamer@frametopskipautobreak=\beamer@frametopskip\relax%
  \beamer@framebottomskipautobreak=\beamer@framebottomskip\relax%
  \def\beamer@initfirstlineunskip{}%
}}
\ProcessOptionsBeamer
\makeatother

\begin{document}
\begin{frame}
This is bottom aligned.
\end{frame}

\begin{frame}
This is also
\end{frame}
\end{document}

输出