如何更改标题的颜色并在 beamer 中的标题页上添加一行

Question

我想将标题页上标题后面的蓝色框改为白色，并将标题颜色改为黑色。

此外，我想在标题和作者之间添加一条橙色的水平直线。理想的最终结果如下：

原始代码如下：

\documentclass{beamer}

\mode<presentation> {
\usetheme{Madrid}
\setbeamertemplate{footline}[page number]
\setbeamertemplate{navigation symbols}{}
}

\usepackage{graphicx}
\usepackage{booktabs}


\title[Short title]{Main Topic }
\author{John Smith}
\institute[UCLA]
{
University of California \\
\medskip
\textit{[email protected]}
}
\date{\today}


\begin{document}

\begin{frame}
\titlepage
\end{frame}


\section{First Section}
\begin{frame}
\frametitle{Paragraphs of Text}
Sed 
\end{frame}

\end{document}

非常感谢！

Answer 1

您可以按如下方式重新定义标题页：

\documentclass{beamer}

\mode<presentation> {
    \usetheme{Madrid}
    \setbeamertemplate{footline}[page number]
    \setbeamertemplate{navigation symbols}{}
}

\usepackage{graphicx}
\usepackage{booktabs}
\usepackage{datetime}

\makeatletter
\setbeamertemplate{title page}
{
    \vbox{}
    \vfill
    \begingroup
    \centering
    \begin{minipage}{.9\linewidth}
    \usebeamerfont{title}\textsc{\inserttitle}\par
    \ifx\insertsubtitle\@empty%
    \else%
    \vskip0.25em%
    {\usebeamerfont{subtitle}\insertsubtitle\par}%
    \fi%
    \vspace{1.7em}
    {\color{orange}\hrule}\vspace{1.7em}
    \usebeamerfont{author}\insertauthor\par\vspace{.7em}
    \usebeamerfont{date}\insertdate\par
    \end{minipage}\par
    \endgroup
    \vfill
    \thispagestyle{empty}
}
\makeatother


\title[Short title]{Main Topic}
\author{John Smith}
\institute[UCLA]
{
    University of California \\
    \medskip
    \textit{[email protected]}
}
\date{\shortmonthname\space\the\year}


\begin{document}

\begin{frame}
    \titlepage
\end{frame}


\section{First Section}
\begin{frame}
\frametitle{Paragraphs of Text}
Sed 
\end{frame}

\end{document}

当然，如果需要的话，你可以将作者和日期的字体更改为衬线字体：

\setbeamerfont{author}{family=\rmfamily}
\setbeamerfont{date}{family=\rmfamily}