如同在节后添加句号。但是我正在使用 KOMA，所以不能使用titlesec。
遵循 APA 风格指南，仅供参考。
梅威瑟：
\documentclass[a4paper, oneside, 12pt, parskip=half]{scrartcl}
\usepackage{lipsum}
% --- APA Style --- %
% For spacing
\usepackage{setspace}
\doublespacing
\setlength{\parindent}{0.5in}
\usepackage{indentfirst} % Indent even the 1st paragraph after each section header.
\addtokomafont{section}{\centering}
\RedeclareSectionCommand[afterskip=-1em, indent=0.5in]{subsubsection}
% --- End of APA Style --- %
\usepackage{lipsum}
\begin{document}
\tableofcontents
\clearpage
\section{This should be centered}
\lipsum[1]
\subsection{This is same as default for KOMA}
\lipsum[2]
\subsubsection[Runin, and need a dot after this title]{Runin, and need a dot after this title.}
Without resorting to using a separate `short title` without period at the end, and a `title` with the ending period, I hope to do just:
\subsubsection{Have dot at end}
\lipsum[3]
\end{document}
答案1
如果子小节是标题，则必须重新定义\sectioncatchphraseformat以在子小节标题文本后插入一个点。
\documentclass[a4paper, oneside, 12pt, parskip=half]{scrartcl}
% --- APA Style --- %
\usepackage{setspace}
\doublespacing
\setlength{\parindent}{0.5in}
\RedeclareSectionCommand[beforeskip=3.5ex plus 1ex minus .2ex]{section}
\RedeclareSectionCommand[beforeskip=3.25ex plus 1ex minus .2ex]{subsection}
\RedeclareSectionCommand[afterskip=-1em, indent=\the\parindent]{subsubsection}
\makeatletter
\renewcommand{\sectionlinesformat}[4]{%
\ifstr{#1}{section}{\centering}{}% center section titles
\@hangfrom{\hskip #2#3}{#4}%
}
\makeatother
\renewcommand{\sectioncatchphraseformat}[4]{%
\hskip #2#3#4%
\ifstr{#1}{subsubsection}{.}{}% dot after subsection titles
}
% --- End of APA Style --- %
\usepackage{lipsum}% only for dummy text
\begin{document}
\tableofcontents
\clearpage
\section{This should be centered}
\lipsum[1]
\subsection{This is same as default for KOMA}
\lipsum[2]
\subsubsection{Runin, and need a dot after this title}
Without resorting to using a separate `short title` without period at the end, and a `title` with the ending period, I hope to do just:
\subsubsection{Have dot at end}
\lipsum[3]
\end{document}
\documentclass{scrbook}
\renewcommand{\thechapter}{\Roman{chapter}}
\usepackage[usedvipsnames]{xcolor}
\usepackage{romanbar}
\RedeclareSectionCommand[
tocentrynumberformat=\def\autodot{}\textcolor{red}
]{chapter}
\usepackage{xpatch}
\xpatchcmd{\addchaptertocentry}
{\addtocentrydefault{chapter}{#1}{#2}}
{\ifstr{#1}{}{\addtocentrydefault{chapter}{#1}{#2}}
{\addtocentrydefault{chapter}{\protect\Romanbar{#1}}{#2}}%
}{}{\PatchFailed}
\usepackage{lipsum}
\begin{document}
\tableofcontents
\chapter{First Chapter}
\lipsum[2]
\chapter{Second Chapter}
\lipsum[2]
\chapter{Third Chapter}
\lipsum[2]
\end{document}
如果所有连续标题都应该在末尾加上点，则使用：
\renewcommand{\sectioncatchphraseformat}[4]{\hskip #2#3#4.}
补充说明：
不要误用字体元素section来使章节标题居中。\sectionlinesformat请重新定义。无需加载包indentfirst。
答案2
这是除（您重新声明，这就是不起作用的原因）之外的所有内容的部分解决方案\subsubsection。宏\sectionlinesformat将自动附加点。
您将在第 21 节（德文指南中的第 508 页，英文指南中的第 461 页）找到此宏的文档（scrguide/scrguien）。它是 KOMA 用于自定义分段（而不是 titlesec 的机制）的宏之一。
\documentclass[a4paper, oneside, 12pt, parskip=half]{scrartcl}
\usepackage{lipsum}
% --- APA Style --- %
% For spacing
\usepackage{setspace}
\doublespacing
\setlength{\parindent}{0.5in}
\usepackage{indentfirst} % Indent even the 1st paragraph after each section header.
\addtokomafont{section}{\centering}
\RedeclareSectionCommand[afterskip=-1em, indent=0.5in]{subsubsection}
\makeatletter
\renewcommand\sectionlinesformat[4]{%
\@hangfrom{\hskip#2 #3}{#4.}
}
\makeatother
\begin{document}
\tableofcontents
\clearpage
\section{This should be centered}
\lipsum[1]
\subsection{This is same as default for KOMA}
\lipsum[2]
\subsubsection[Runin, and need a dot after this title]{Runin, and need a dot after this title.}
Without resorting to using a separate `short title` without period at the end, and a `title` with the ending period, I hope to do just:
\subsubsection{Have dot at end}
\lipsum[3]
\end{document}