条件语句破坏框架

Question

我尝试使用 if else fi 在标题页上获取不同的标题，但它破坏了框架样式。为什么？

需要 beamertheme.sty 的帮助

\setbeamertemplate{headline}
{%
  \ifnum \insertpagenumber=1
    \begin{beamercolorbox}[wd=\paperwidth, ht=2mm, dp=1mm]{head1}\end{beamercolorbox}%
  \else
    \begin{beamercolorbox}[wd=\paperwidth, ht=2mm, dp=1mm]{head1}\end{beamercolorbox}%
    \vspace*{1mm}%
    \hspace{1mm}\includegraphics[width=0.1\paperwidth]{fig/logo.png}%
    \vspace{1mm}%
    \newline%
    \begin{beamercolorbox}[wd=\paperwidth, ht=0.5mm, dp=1mm]{head1}\end{beamercolorbox}%
  \fi
}
\setbeamercolor{head1}{fg=white, bg=black}

没有 if else fi

\setbeamertemplate{headline}{%
  \begin{beamercolorbox}[wd=\paperwidth, ht=2mm, dp=1mm]{head1}\end{beamercolorbox}%
  \vspace*{1mm}%
  \hspace{1mm}\includegraphics[width=0.1\paperwidth]{fig/logo.png}%
  \vspace{1mm}%
  \newline%
  \begin{beamercolorbox}[wd=\paperwidth, ht=0.5mm, dp=1mm]{head1}\end{beamercolorbox}%
}
\setbeamercolor{head1}{fg=white, bg=black}

更新：看起来接下来的页面与第一个标题对齐。

Answer 1

我发现了一个肮脏的解决方案（仅当标题页上的标题较大时才有效）：

beamerthemeooo​​o.sty

% Head line for frames
\defbeamertemplate*{headline}{headline frames}
{%
  \begin{beamercolorbox}[wd=\paperwidth, ht=3mm]{head1}\end{beamercolorbox}%
  \vspace*{1mm}%
  \hspace*{1mm}\includegraphics[height=8mm]{fig/logo.png}%
  \vspace*{1mm}%
  \newline%
  \begin{beamercolorbox}[wd=\paperwidth, ht=1mm]{head1}\end{beamercolorbox}%
}
% Head line for title page
\defbeamertemplate*{headline}{headline titlepage}
{%
  \begin{beamercolorbox}[wd=\paperwidth, ht=3mm]{head1}\end{beamercolorbox}%
  \vspace*{1mm}
  \hspace*{1mm}\includegraphics[height=30mm]{fig/logo.png}
}
\setbeamercolor{head1}{fg=white, bg=black}

beamer.tex

\setbeamertemplate{headline}[headline frames]% for whole document
\begin{document}
\setbeamertemplate{headline}[headline titlepage]% change to titlepage headline
\begin{frame}
\titlepage
\end{frame}
\setbeamertemplate{headline}[headline frames]% change back to frame headline