修改 beamer 中 CambridgeUS 主题的标题，使其类似于 Copenhagen 主题

Question

我正在尝试使 CambridgeUS 主题的标题类似于 Copenhagen 主题。我想添加类似于拆分外部主题的部分/子部分导航。

\documentclass{beamer}
\usetheme{CambridgeUS}
\setbeamertemplate{headline}
{
\leavevmode%
\begin{beamercolorbox}[wd=.5\paperwidth]{section in head/foot}%
        \insertsectionnavigation{.5\paperwidth}%
    \end{beamercolorbox}%
    \begin{beamercolorbox}[wd=.5\paperwidth]{subsection in head/foot}%
        \insertsubsectionnavigation{.5\paperwidth}%
\end{beamercolorbox}%
}
\begin{document}
\frame{\titlepage}
\section{This is my first section}
\begin{frame}
\frametitle{title 1}
\end{frame}
\section{This is my second section}
\subsection{This is my first subsection}
\begin{frame}
\frametitle{title 2}
\end{frame}
\subsection{This is my second subsection}
\begin{frame}
\frametitle{title 3}
\end{frame}
\end{document}

Answer 1

\useoutertheme{split}后添加\usetheme{CambridgeUS}。

\documentclass{beamer}

\usetheme{CambridgeUS}
\useoutertheme{split}

\begin{document}
\frame{\titlepage}

\section{This is my first section}
\begin{frame}
  \frametitle{title 1}
\end{frame}

\section{This is my second section}
\subsection{This is my first subsection}
\subsection{This is my second subsection}
\begin{frame}
  \frametitle{title 2}
\end{frame}

\subsection{This is my second subsection}
\begin{frame}
  \frametitle{title 3}
\end{frame}
\end{document}

更新

split外部主题更改了标题和脚注中使用的模板和颜色样式。为了保持脚注的颜色样式和样式不变，我手动从中选择了新标题样式的定义beameroutertemplatesplit.sty。

\documentclass{beamer}
\usetheme{CambridgeUS}

%%
%% Define and install beamer template "headline", option "split theme".
%% This is copied from beamerouterthemesplit.sty.
%%
\makeatletter
\usesectionheadtemplate
  {\hfill\insertsectionhead}
  {\hfill\color{fg!50!bg}\insertsectionhead}

% Head
\ifbeamer@compress

\defbeamertemplate*{headline}{split theme}
{%
  \leavevmode%
  \begin{beamercolorbox}[wd=.5\paperwidth,ht=2.5ex,dp=1.125ex]{section in head/foot}%
    \insertsectionnavigationhorizontal{.5\paperwidth}{\hskip0pt plus1filll}{}%
  \end{beamercolorbox}%
  \begin{beamercolorbox}[wd=.5\paperwidth,ht=2.5ex,dp=1.125ex]{subsection in head/foot}%
    \insertsubsectionnavigationhorizontal{.5\paperwidth}{}{\hskip0pt plus1filll}%
  \end{beamercolorbox}%
}

\else

\defbeamertemplate*{headline}{split theme}
{%
  \leavevmode%
  \@tempdimb=2.4375ex%
  \ifnum\beamer@subsectionmax<\beamer@sectionmax%
    \multiply\@tempdimb by\beamer@sectionmax%
  \else%
    \multiply\@tempdimb by\beamer@subsectionmax%
  \fi%
  \ifdim\@tempdimb>0pt%
    \advance\@tempdimb by 1.825ex%
    \begin{beamercolorbox}[wd=.5\paperwidth,ht=\@tempdimb]{section in head/foot}%
      \vbox to\@tempdimb{\vfil\insertsectionnavigation{.5\paperwidth}\vfil}%
    \end{beamercolorbox}%
    \begin{beamercolorbox}[wd=.5\paperwidth,ht=\@tempdimb]{subsection in head/foot}%
      \vbox to\@tempdimb{\vfil\insertsubsectionnavigation{.5\paperwidth}\vfil}%
    \end{beamercolorbox}%
  \fi%
}

\fi
\makeatother
%%
%% end of lines from beamerouterthemesplit.sty
%% 

\begin{document}
\frame{\titlepage}
\section{This is my first section}
\begin{frame}
\frametitle{title 1}
\end{frame}
\section{This is my second section}
\subsection{This is my first subsection}
\begin{frame}
\frametitle{title 2}
\end{frame}
\subsection{This is my second subsection}
\begin{frame}
\frametitle{title 3}
\end{frame}
\end{document}