如何重新定义 beamer 模板

Question

到目前为止，我尝试重新定义 beamer 模板时没有成功。在texwelt.de我发现提示只需使用 \setbeamertemplate，但这不起作用。

\documentclass{beamer}
\usetheme{default}
\AtBeginDocument{%
\setbeamertemplate*{block example begin}
{
  \par\vskip\medskipamount%
  \begin{beamercolorbox}[colsep*=.75ex]{block title example}
    \usebeamerfont*{block title example}\insertblocktitle%
  \end{beamercolorbox}%
  {\parskip0pt\par}%
  \ifbeamercolorempty[bg]{block title example}
  {}
  {\ifbeamercolorempty[bg]{block body example}{}{\nointerlineskip\vskip-0.5pt}}%
  \usebeamerfont{block body example}%
  \begin{beamercolorbox}[colsep*=.75ex,vmode]{block body example}%
    \ifbeamercolorempty[bg]{block body example}{\vskip-.25ex}{\vskip-.75ex}\vbox{}%
}
}

\begin{document}
A
\end{document}

Answer 1

\AtBeginDocument不是必需的，并且设置 beamer 模板的命令也不是\setbeamertemplate。\setbeamertemplate*以下代码对我来说很好用：

\documentclass{beamer}

\setbeamertemplate{block example begin}
{
  \par\vskip\medskipamount%
  \begin{beamercolorbox}[colsep*=.75ex]{block title example}
    \usebeamerfont*{block title example}\insertblocktitle%
  \end{beamercolorbox}%
  {\parskip0pt\par}%
  \ifbeamercolorempty[bg]{block title example}
  {}
  {\ifbeamercolorempty[bg]{block body example}{}{\nointerlineskip\vskip-0.5pt}}%
  \usebeamerfont{block body example}%
  \begin{beamercolorbox}[colsep*=.75ex,vmode]{block body example}%
    \ifbeamercolorempty[bg]{block body example}{\vskip-.25ex}{\vskip-.75ex}\vbox{}%
}

\begin{document}
\begin{frame}
\begin{exampleblock}{Example}
    Block content.
\end{exampleblock}
\end{frame}
\end{document}