如果引入 \pagesty{fancy}，则无法更新命令内容名称

Question

当我自定义\contentsnamewith时\renewcommand，发现\pagestyle{fancy}或的存在\thispagestyle{fancy}会导致编译失败。我不明白为什么？这是\contentsname包 或 的问题吗fancyhdr？

梅威瑟：

\documentclass{article}
\usepackage{geometry,fancyhdr}
\geometry{showframe}

\begin{document}
  \pagestyle{fancy}% This command leads to un-compiled. If this command is commented, or replaced by\pagestyle{plain}, everyting is all right.
  \renewcommand\contentsname{%
    \LARGE%
    \centering%
       my\\ content%
  }
  \tableofcontents

\section{section}
text

\end{document}

PS：我发现与位置相关的宏，例如\centering，\\是失败的原因。其他与位置无关的宏，例如\color，\Large不影响\renewcommand\contentsname。

Answer 1

\documentclass{article}
\usepackage{geometry,fancyhdr,titlesec,xcolor}
\geometry{showframe}

\begin{document}
  \pagestyle{fancy}% This command leads to un-compiled. If this command is commented, or replaced by\pagestyle{plain}, everyting is all right.
   \renewcommand\contentsname{%
       My \\ content%
}
{
\titleformat*{\section}{\vspace*{-0.5\baselineskip}\centering \LARGE\color{red}}
  \tableofcontents
}
\section{section}
text

\end{document}