自定义 beamer 块环境：下划线块标题

Question

我正在尝试在 beamer 中定义带下划线的块标题，但无法做到。有人能帮我吗？我设法自定义了块标题的特定字体和形状，但到目前为止，下划线还没有成功。我的（成功）代码如下：

\setbeamerfont{block title}{size=\normalsize, series=\bfseries}

\underline命令不起作用（\ul灵魂包也不起作用）...欢迎任何帮助！

Answer 1

附言：（取自此处更改投影仪中块的默认宽度）

\documentclass[10pt,a4paper]{beamer}
\usepackage[latin1]{inputenc}
\usetheme{Warsaw}


\newenvironment<>{varblock}[2][\textwidth]{%
    \setlength{\textwidth}{#1}
    \begin{actionenv}#3%
        \def\insertblocktitle{\underline{#2}}%
        \par%
        \usebeamertemplate{block begin}}
    {\par%
        \usebeamertemplate{block end}%
\end{actionenv}}
\begin{document}

    \begin{frame}
    \frametitle{Sample frame title}
    This is a text in the first frame. This is a text in the first frame. This is a text in the first frame.
    {\begin{varblock}{title}blabla\end{varblock}}
\end{frame}
\end{document}

结果：

Answer 2

为了修补所有块以使其具有下划线标题，您可以在 beamer 模板的开头添加\insertblocktitleas的重新定义。\underline{\insertblocktitle}block begin

编辑：类似地，对于exampleblock和alertblock环境，将相同的行添加到block example begin和block alerted beginbeamer 模板。

梅威瑟：

\documentclass{beamer}
\addtobeamertemplate{block begin}{%
    \let\oldinsertblocktitle\insertblocktitle%
    \def\insertblocktitle{\underline{\oldinsertblocktitle}}%
}{}
\addtobeamertemplate{block example begin}{%
    \let\oldinsertblocktitle\insertblocktitle%
    \def\insertblocktitle{\underline{\oldinsertblocktitle}}%
}{}
\addtobeamertemplate{block alerted begin}{%
    \let\oldinsertblocktitle\insertblocktitle%
    \def\insertblocktitle{\underline{\oldinsertblocktitle}}%
}{}
\begin{document}
\begin{frame}{My frame}
\begin{block}{My block}
    has some content
\end{block}
\begin{exampleblock}{My block}
    has some content
\end{exampleblock}
\begin{alertblock}{My block}
    has some content
\end{alertblock}
\end{frame}
\end{document}