如何使标题居中？

Question

如何使标题居中？

\documentclass[12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{setspace}
\usepackage[colorlinks,citecolor=blue,urlcolor=blue,linkcolor=black]{hyperref}
\usepackage{hypernat}

\usepackage{caption}
\usepackage{subcaption}
\usepackage{pdflscape}

\usepackage{afterpage}
\usepackage{xcolor}

\usepackage{verbatim}

\usepackage[margin=2.5cm]{geometry}
\usepackage{url}
\usepackage{booktabs,caption,fixltx2e}
\usepackage[flushleft]{threeparttable}
\usepackage{setspace}
\usepackage[capposition=top]{floatrow}

\usepackage{float}

\usepackage{rotating}
\usepackage{bm}

\usepackage{tabularx}

\onehalfspacing
\usepackage{graphicx}

\usepackage{subfig}

\renewcommand{\familydefault}{\sfdefault}

\font\titlefont=cmr12 at 40pt

\begin{document}
\pagenumbering{gobble}% Remove page numbers (and reset to 1)

\begin{center}
\color{white}{
  \titlefont 
  {\fontfamily{cmss}\selectfont
   \scalebox{5}{Big Title} 
  }
    \titlefont \\
    \vspace{2cm}
  {\fontfamily{cmss}\selectfont
   \scalebox{2}{Small title} 
  }
  }
\end{center}

\pagecolor{purple}\afterpage{\nopagecolor}

\newpage
\tableofcontents
\end{document}

Answer 1

要使标题垂直居中，请将说明放在\vspace*{\fill}前面\begin{center}，将说明\vspace*{\fill}放在后面\end{center}。

我认为你应该简化和整理你使用的 LaTeX 代码，因为它目前相当不透明、不必要地复杂，而且充满了冗余。不要多次加载包，并确保加载hyperref 最后的。哦，您可能已经发现，您不能同时加载subcaption和subfig。

我尝试在以下版本的代码中做了初步清理。请尝试仔细阅读前言并删除文档中所有您根本不使用的包。

\documentclass[12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsthm}

\usepackage{setspace}
\onehalfspacing

\usepackage{caption}
\usepackage{subcaption}
\usepackage{pdflscape}

\usepackage{afterpage}
\usepackage{xcolor}
\usepackage{verbatim}

\usepackage[margin=2.5cm]{geometry}
\usepackage[hyphens,spaces]{url} % 'hyphens' and 'spaces' options are very useful
\usepackage{booktabs}

%%,caption}   % no need to load twice
%% ,fixltx2e} % no need to load unless your TeX distribution is *ancient*

\usepackage[flushleft]{threeparttable}

%%\usepackage{setspace} % no need to load twice

\usepackage[capposition=top]{floatrow}
\usepackage{float}

\usepackage{rotating}
\usepackage{bm}

\usepackage{tabularx}
%%\usepackage{graphicx} % is loaded automatically by  'rotating' package

%% Load 'hyperref' package *last*
\usepackage[colorlinks,citecolor=blue,urlcolor=blue,
            linkcolor=black]{hyperref}
%% \usepackage{hypernat} % no need to load unless your TeX distribution is **ancient**

%%\usepackage{subfig}  % conflicts with 'subcaption'

\renewcommand{\familydefault}{\sfdefault}

% ------- end of preamble -------- %

\begin{document}
\pagenumbering{gobble}

\pagecolor{purple}

\vspace*{\fill}
\begin{center}
  \color{white}
  \scalebox{5}{Big Title}\\[2cm]
  \scalebox{2}{Small title}
\end{center}
\vspace{\fill}

\newpage
\nopagecolor 

\tableofcontents   
% remainder of document

\end{document}