我无法在定理环境（thmtools）中获取数字

Question

我似乎无法在我的自定义定理环境中找回我的定理的数字，希望能得到一些帮助：

\documentclass[10pt,a4paper]{article}


\usepackage{amsthm}
\usepackage{thmtools}
\usepackage{hyperref,nameref}

\makeatletter
\declaretheoremstyle[
spaceabove=6pt, 
spacebelow=6pt, 
headfont=\normalfont\bfseries, 
notefont=\em\mdseries, 
notebraces={(}{)}, 
headpunct={},
bodyfont=\itshape, 
headformat=\NAME\ \NOTE\\\@afterheading,
]{theorem}
\makeatother

\declaretheorem[style=theorem,
numbered=yes,
name=Theorem, 
refname={theorem,theorem}, 
Refname={Theorem,Theorems}]{theorem}

\begin{document}


\section{First section}
\begin{theorem}
First theorem
\end{theorem}

\begin{theorem}
Second theorem
\end{theorem}

\section{Second section}

\begin{theorem}
Third theorem
\end{theorem}

\end{document}

Answer 1

您只需格式化以添加\NUMBER命令：

\documentclass[10pt,a4paper]{article}

\usepackage{xcolor}
\usepackage{amsthm}
\usepackage{thmtools}
\usepackage{hyperref,nameref}

\makeatletter
\declaretheoremstyle[
spaceabove=6pt,
spacebelow=6pt,
headfont=\normalfont\bfseries,
notefont=\em\mdseries,
notebraces={(}{)},
headpunct={},
bodyfont=\itshape,
headformat=\NAME\,\textcolor{red}{\NUMBER}\NOTE\\\@afterheading,
]{theorem}
\makeatother

\declaretheorem[style=theorem,
numbered=yes,
name=Theorem,
refname={theorem,theorem},
Refname={Theorem,Theorems}]{theorem}

\begin{document}


\section{First section}
\begin{theorem}[First trial]
First theorem
\end{theorem}

\begin{theorem}
Second theorem
\end{theorem}

\section{Second section}

\begin{theorem}
Third theorem
\end{theorem}

\end{document}