footline和headline所放位置产生的这种遮盖冲突:
%%%%% Xelatex
\documentclass[10pt,aspectratio=169]{beamer}
\usepackage{color}
\usepackage{ctex}
\usetheme[]{Pittsburgh}
\definecolor{green}{RGB}{77,124,44}
\setbeamercolor{footline color}{fg=black,bg=green!20}
\setbeamercolor{headline color}{fg=red,bg=green!50}
\setbeamercolor{symbol color}{fg=green}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%设置标题、作者、机构等信息
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\title[beamer short title]{\vspace{2cm}\newline \textbf{Beamer template for presentations}}
\author[Trump]{Donald J. Trump}
\institute{University}
\date{2016}
\begin{document}
{
\logo{\includegraphics[scale=0.25]{logo}\hspace{\dimexpr\paperwidth-1.8cm}\vspace{-0cm}}
\usebackgroundtemplate{\includegraphics[width=\paperwidth,height=\textheight,keepaspectratio=true]{head}}
\frame{\titlepage}
}
\begin{frame}{Outline}
\tableofcontents
\end{frame}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%设置headline 显示各章主题
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\setbeamertemplate{headline}
{
\begin{beamercolorbox}[wd=\paperwidth,center]{headline color}%
\usebeamerfont{title in head/foot}
\insertsectionnavigationhorizontal{\dimexpr\paperwidth-2cm}{}{}
\end{beamercolorbox}%
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%设置footline为带底色 显示页码、作者简短姓名、标题简短姓名
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\setbeamertemplate{footline}{
\begin{beamercolorbox}[wd=\paperwidth, ht=2.25ex, dp=1ex, leftskip=0pt, rightskip=10pt]{footline color}{
\insertshortauthor \hfill \insertshorttitle \hfill \insertframenumber/\inserttotalframenumber}
\end{beamercolorbox}%
}
\section{section1}
\begin{frame}
Bla bla bla \footnote{footnote1} Ble ble ble\footnote{footnote2}
\end{frame}
\section{section2}
\begin{frame}
内容...
\end{frame}
\end{document}
%%%%% Xelatex
\documentclass[10pt,aspectratio=169]{beamer}
\usepackage{color}
\usepackage{ctex}
\usetheme[]{Pittsburgh}
\definecolor{green}{RGB}{77,124,44}
\setbeamercolor{footline color}{fg=black,bg=green!20}
\setbeamercolor{headline color}{fg=red,bg=green!50}
\setbeamercolor{symbol color}{fg=green}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%设置headline 显示各章主题
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\setbeamertemplate{headline}
{
\begin{beamercolorbox}[wd=\paperwidth,center]{headline color}%
\usebeamerfont{title in head/foot}
\insertsectionnavigationhorizontal{\dimexpr\paperwidth-2cm}{}{}
\end{beamercolorbox}%
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%设置footline为带底色 显示页码、作者简短姓名、标题简短姓名
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\setbeamertemplate{footline}{
\begin{beamercolorbox}[wd=\paperwidth, ht=2.25ex, dp=1ex, leftskip=0pt, rightskip=10pt]{footline color}{
\insertshortauthor \hfill \insertshorttitle \hfill \insertframenumber/\inserttotalframenumber}
\end{beamercolorbox}%
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%设置标题、作者、机构等信息
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\title[beamer short title]{\vspace{2cm}\newline \textbf{Beamer template for presentations}}
\author[Trump]{Donald J. Trump}
\institute{University}
\date{2016}
\begin{document}
{
\logo{\includegraphics[scale=0.25]{logo}\hspace{\dimexpr\paperwidth-1.8cm}\vspace{-0cm}}
\usebackgroundtemplate{\includegraphics[width=\paperwidth,height=\textheight,keepaspectratio=true]{head}}
\frame{\titlepage}
}
\begin{frame}{Outline}
\tableofcontents
\end{frame}
\section{section1}
\begin{frame}
Bla bla bla \footnote{footnote1} Ble ble ble\footnote{footnote2}
\end{frame}
\section{section2}
\begin{frame}
内容...
\end{frame}
\end{document}
个人建议:
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%设置headline 显示各章主题
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\setbeamertemplate{headline}
{
\begin{beamercolorbox}[wd=\paperwidth,center]{headline color}%
\usebeamerfont{title in head/foot}
\insertsectionnavigationhorizontal{\dimexpr\paperwidth-2cm}{}{}
\end{beamercolorbox}%
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%设置footline为带底色 显示页码、作者简短姓名、标题简短姓名
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\setbeamertemplate{footline}{
\begin{beamercolorbox}[wd=\paperwidth, ht=2.25ex, dp=1ex, leftskip=0pt, rightskip=10pt]{footline color}{
\insertshortauthor \hfill \insertshorttitle \hfill \insertframenumber/\inserttotalframenumber}
\end{beamercolorbox}%
}
[plain]
可选项,如:\frame[plain,noframenumbering]{\titlepage}
或
\begin{frame}[plain,noframenumbering]{Outline}
\tableofcontents
\end{frame}
其中的[noframenumbering]
选项用于停止该帧计数。
PS.建议在命令行用texdoc beamer
打开其说明书,通读后按Beamer的逻辑进行工作,而不是简单的以结果导向写代码。