看起来 beamer 主题focus已经删除了该\framesubtitle功能，也就是说，传递给的附加参数\begin{frame}{title}{subtitle}或显式命令都不起作用\framesubtitle{text of subtitle}（即，它们只是被省略了）。
有没有办法恢复此功能，同时能够使用该focus主题？
这是 MWE
\title{Focus: \\ A Minimalist Beamer Theme}
\subtitle{Subtitle}
\author{Author 1\texorpdfstring{\\}{,} Author 2}
\institute{Institute Name \\ Institute Address}
\date{dd mm yyyy}
\begin{document}
\begin{frame}
\maketitle
\end{frame}
\begin{frame}{Simple frame}{Subtitle}
This is a simple frame with a subtitle that does not work.
\end{frame}
\begin{frame}{Simple frame}
\framesubtitle{This does not work!}
This is another simple frame with a subtitle that does not work.
\end{frame}
\end{document}
我们如何修复这个问题？
答案1
参考此前问题您应该使用以下内容beamerouterthemefocus.sty：
% Copyright (C) 2018-2019 Pasquale Claudio Africa and the LaTeX community.
% A full list of contributors can be found at
%
% https://github.com/elauksap/focus-beamertheme
%
% This file is part of beamerthemefocus.
%
% beamerthemefocus is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% beamerthemefocus is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with beamerthemefocus. If not, see <http://www.gnu.org/licenses/>.
\mode<presentation>
\RequirePackage{appendixnumberbeamer} % Don't number appendix frames.
% Fix hyperref warning caused by \appendix
% (https://tex.stackexchange.com/questions/192686/hyperref-warning-caused-by-beamer-appendix).
\newcommand*{\bkmtranslateto}{\languagename}
\newcommand*{\bkmtranslate}[1]{%
\ifcsname tr@@@\bkmtranslateto @#1\endcsname
\csname tr@@@\bkmtranslateto @#1\endcsname
\else
#1%
\fi
}
\pdfstringdefDisableCommands{\let\translate\bkmtranslate}
\RequirePackage{bookmark}
\RequirePackage{etoolbox} % \BeforeBeginEnvironment.
\RequirePackage{tikz}
% FRAMETITLE TEMPLATES. --------------------------------------------------------
\defbeamertemplate*{frametitle}{focus}{%
% If not title page.
\ifnum\value{framenumber}>0%
% \vspace{-1pt}%
% \begin{beamercolorbox}[wd=\paperwidth,leftskip=0.55cm,rightskip=0.55cm,sep=0.2cm]{frametitle}%
% \strut\insertframetitle\strut%
%\hfill\includegraphics[scale=0.3]{logoUCL}\vskip0pt
% \end{beamercolorbox}%
\usebeamercolor{frametitle}\colorlet{focus@@temp}{bg}
\tikz[remember picture, overlay] {
\fill[color=focus@@temp] (current page.north west) rectangle ([yshift=-1.5cm]current page.north east) node[anchor= south east,inner sep=0pt]{\includegraphics[scale=0.3]{logoUCL}};
\node[anchor=west] at ([shift={(0.55cm,-0.75cm)}]current page.north west) {\insertframetitle};
\node[anchor=west] at ([shift={(0.55cm,-1.2cm)}]current page.north west) {\small\insertframesubtitle};
}
\fi%
}
% Plain header.
\defbeamertemplate*{frametitle}{plain}{%
% If not title page.
\ifnum\value{framenumber}>0%
\vspace{-1pt}%
\begin{beamercolorbox}[wd=\paperwidth,leftskip=0.55cm,rightskip=0.55cm,sep=0.2cm,ignorebg]{frametitle}%
\strut%
\end{beamercolorbox}%
\fi%
}
% FOOTLINE TEMPLATES. ----------------------------------------------------------
% Lenghts for the progress bar footline.
\newlength{\focus@pbar@height}% Progress bar height.
\newlength{\focus@pbar@leftoffset}
\newlength{\focus@pbar@rightoffset}
\defbeamertemplate*{footline}{progressbar}{%
% If not appendix.
\ifnum\mainend<0% From package appendixnumberbeamer.
%
\settowidth{\focus@pbar@leftoffset}{1}%
\addtolength{\focus@pbar@leftoffset}{1.5em}%
%
\settowidth{\focus@pbar@rightoffset}{\inserttotalframenumber}%
\addtolength{\focus@pbar@rightoffset}{1.5em}%
%
% If not title page.
\ifnum\c@framenumber>0%
\ifnum\c@framenumber<\inserttotalframenumber%
\begin{tikzpicture}[inner xsep=0.5em, inner ysep=0.5ex]\usebeamerfont{footline}
\pgfmathsetmacro{\focus@pbar@progress}%
{(\paperwidth-\focus@pbar@leftoffset-\focus@pbar@rightoffset)*(\insertframenumber/\inserttotalframenumber)}
\clip (0,0) rectangle ++(\paperwidth,\the\focus@pbar@height);
\fill[footline.bg] (0,0) rectangle ++(\the\focus@pbar@leftoffset,\the\focus@pbar@height);
\fill[footline.bg] (\the\focus@pbar@leftoffset,0) rectangle ++(\focus@pbar@progress pt,\the\focus@pbar@height)
++(0,{-0.5*\the\focus@pbar@height}) node[anchor=east, text=footline.fg] {\strut\insertframenumber};
\fill[footline.bg] (\paperwidth,0) rectangle ++(-\the\focus@pbar@rightoffset,\the\focus@pbar@height)
++(0,{-0.5*\the\focus@pbar@height}) node[anchor=west, text=footline.fg] {\strut\inserttotalframenumber};
\end{tikzpicture}%
\else%
\begin{tikzpicture}[inner xsep=0.5em, inner ysep=0.5ex]
\clip (0,0) rectangle ++(\paperwidth,\the\focus@pbar@height);
\fill[footline.bg] (0,0) rectangle ++(\paperwidth,\the\focus@pbar@height);
\node[anchor=east, footline.fg] at ({\paperwidth-\the\focus@pbar@rightoffset},{0.5*\focus@pbar@height}) {\strut\insertframenumber};
\node[footline.fg] at ({\paperwidth-\the\focus@pbar@rightoffset},{0.5*\focus@pbar@height}) {\strut/};
\node[anchor=west, footline.fg] at ({\paperwidth-\the\focus@pbar@rightoffset},{0.5*\focus@pbar@height}) {\strut\inserttotalframenumber};
\end{tikzpicture}%
\fi%
\fi%
\fi%
}
% Full bar footline.
\defbeamertemplate*{footline}{fullbar}{%
% If not appendix.
\ifnum\mainend<0% From package appendixnumberbeamer.
%
\settowidth{\focus@pbar@leftoffset}{1}%
\addtolength{\focus@pbar@leftoffset}{1.5em}%
%
\settowidth{\focus@pbar@rightoffset}{\inserttotalframenumber}%
\addtolength{\focus@pbar@rightoffset}{1.5em}%
%
% If not title page.
\ifnum\c@framenumber>0%
\begin{tikzpicture}[inner xsep=0.5em, inner ysep=0.5ex]
\clip (0,0) rectangle ++(\paperwidth,\the\focus@pbar@height);
\fill[footline.bg] (0,0) rectangle ++(\paperwidth,\the\focus@pbar@height);
\node[anchor=east, footline.fg] at ({\paperwidth-\the\focus@pbar@rightoffset},{0.5*\focus@pbar@height}) {\strut\insertframenumber};
\node[footline.fg] at ({\paperwidth-\the\focus@pbar@rightoffset},{0.5*\focus@pbar@height}) {\strut/};
\node[anchor=west, footline.fg] at ({\paperwidth-\the\focus@pbar@rightoffset},{0.5*\focus@pbar@height}) {\strut\inserttotalframenumber};
\end{tikzpicture}%
\fi%
\fi%
}
% Empty footline.
\defbeamertemplate*{footline}{none}{}
\DeclareOptionBeamer{numbering}{\def\beamer@focus@numbering{#1}}
\ExecuteOptionsBeamer{numbering=progressbar}
\ProcessOptionsBeamer
\def\beamer@focus@numberingprogressbar{progressbar}
\def\beamer@focus@numberingfullbar{fullbar}
\def\beamer@focus@numberingnone{none}
% BACKGROUND CANVAS TEMPLATES. -------------------------------------------------
\defbeamertemplate*{background canvas}{focus}{%
\begin{tikzpicture}
\clip (0,0) rectangle ++(\paperwidth,\paperheight);
\fill[normal text.bg] (0,0) rectangle ++(\paperwidth,\paperheight);
\end{tikzpicture}%
}
\defbeamertemplate*{background canvas}{focusplain}{%
\begin{tikzpicture}
\clip (0,0) rectangle ++(\paperwidth,\paperheight);
\fill[normal text.bg] (0,0) rectangle ++(\paperwidth,\paperheight);
\end{tikzpicture}%
}
\defbeamertemplate*{background canvas}{focusframe}{%
\begin{tikzpicture}
\clip (0,0) rectangle ++(\paperwidth,\paperheight);
\fill[frametitle.bg] (0,0) rectangle ++(\paperwidth,\paperheight);
\end{tikzpicture}%
}
% HOOKS FOR CREATING FRAMES. ---------------------------------------------------
\BeforeBeginEnvironment{frame}{%
\setbeamertemplate{background canvas}[focus]%
\setbeamertemplate{frametitle}[focus]%
%
% Reset footline height and determine it for the current slide.
\setlength{\focus@pbar@height}{0cm}%
\focus@calculatefootheight%
%
% If not appendix.
\ifnum\mainend<0 % From package appendixnumberbeamer.
\settoheight{\focus@pbar@height}{\usebeamerfont{footline}1234567890/}%
\addtolength{\focus@pbar@height}{6pt}%
%
\ifx\beamer@focus@numbering\beamer@focus@numberingprogressbar%
\setbeamertemplate{footline}[progressbar]%
\else%
\ifx\beamer@focus@numbering\beamer@focus@numberingfullbar%
\setbeamertemplate{footline}[fullbar]%
\fi%
\fi%
%
\focus@calculatefootheight%
\fi%
}
% Enable noframenumbering option.
\define@key{beamerframe}{noframenumbering}[true]{%
\setbeamertemplate{footline}[none]%
\setlength{\focus@pbar@height}{0cm}%
\focus@calculatefootheight%
%
\addtocounter{framenumber}{-1}%
}
% Enable plain option.
\define@key{beamerframe}{plain}[true]{%
\setbeamertemplate{background canvas}[focusplain]%
\setbeamertemplate{frametitle}[plain]%
%
\setbeamertemplate{footline}[none]%
}
% Full vertical centering
% (from https://tex.stackexchange.com/questions/247826/beamer-full-vertical-centering).
\define@key{beamerframe}{c}[true]{%
\beamer@frametopskip=0pt plus 1fill\relax%
\beamer@framebottomskip=0pt plus 1fill\relax%
\beamer@frametopskipautobreak=0pt plus 0.4\paperheight\relax%
\beamer@framebottomskipautobreak=0pt plus 0.6\paperheight\relax%
\def\beamer@initfirstlineunskip{}%
}
% Enable focus option.
\providebool{focus@standout}
\define@key{beamerframe}{focus}[true]{%
\booltrue{focus@standout}%
\begingroup%
\setkeys{beamerframe}{noframenumbering}%
\setbeamertemplate{background canvas}[focusframe]%
\setbeamertemplate{frametitle}[plain]%
%
\setkeys{beamerframe}{c}%
\centering%
\usebeamerfont{focusframe}%
\usebeamercolor[fg]{frametitle}%
}
\apptocmd{\beamer@reseteecodes}
{%
\ifbool{focus@standout}%
{%
\endgroup%
\boolfalse{focus@standout}%
}{}%
}{}{}
% Recalculate the footline's size and refresh other parameters.
% Partially copied from the definition of \beamer@calculateheadfoot.
\def\focus@calculatefootheight{%
\footheight=\focus@pbar@height%
\advance\footheight by 4pt%
\sidebarheight=\paperheight%
\advance\sidebarheight by-\headheight%
\advance\sidebarheight by\headdp%
\advance\sidebarheight by-\footheight%
\advance\sidebarheight by 4pt%
\footskip=\footheight%
\textheight=\paperheight%
\advance\textheight by-\footheight%
\advance\textheight by-\headheight%
\@colht\textheight%
\@colroom\textheight%
\vsize\textheight%
}
\mode<all>
结果如下：
