答案1
我发现序言中的这一补充可能会有所帮助:
\setbeamertemplate{headline}
{%
\leavevmode%
\hbox{%
\begin{beamercolorbox}[wd=.5\paperwidth,ht=3.05ex,dp=1.5ex,right]{section in head/foot}%
\usebeamerfont{section in head/foot}\insertsectionhead\hspace*{2ex}
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=.5\paperwidth,ht=3.05ex,dp=1.5ex,left]{subsection in head/foot}%
\usebeamerfont{subsection in head/foot}\hspace*{2ex}\insertsubsectionhead
\end{beamercolorbox}}%
\vskip0pt%
}%
ht
可以增加该参数以腾出上方的空间并dp
腾出下方的空间。