问题0:
直接编译你的代码会得到一长串的警告:
Missing character: There is no T ("54) in font nullfont!
Missing character: There is no h ("68) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no o ("6F) in font nullfont!
Missing character: There is no r ("72) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no m ("6D) in font nullfont!
Missing character: There is no 1 ("31) in font nullfont!
Missing character: There is no . ("2E) in font nullfont!
Missing character: There is no 0 ("30) in font nullfont!
Missing character: There is no . ("2E) in font nullfont!
Missing character: There is no 1 ("31) in font nullfont!
Missing character: There is no . ("2E) in font nullfont!
Missing character: There is no ( ("28) in font nullfont!
Missing character: There is no S ("53) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no m ("6D) in font nullfont!
Missing character: There is no i ("69) in font nullfont!
Missing character: There is no d ("64) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no f ("66) in font nullfont!
Missing character: There is no i ("69) in font nullfont!
Missing character: There is no n ("6E) in font nullfont!
Missing character: There is no i ("69) in font nullfont!
Missing character: There is no t ("74) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no v ("76) in font nullfont!
Missing character: There is no a ("61) in font nullfont!
Missing character: There is no n ("6E) in font nullfont!
Missing character: There is no i ("69) in font nullfont!
Missing character: There is no s ("73) in font nullfont!
Missing character: There is no h ("68) in font nullfont!
Missing character: There is no i ("69) in font nullfont!
Missing character: There is no n ("6E) in font nullfont!
Missing character: There is no g ("67) in font nullfont!
Missing character: There is no t ("74) in font nullfont!
Missing character: There is no h ("68) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no o ("6F) in font nullfont!
Missing character: There is no r ("72) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no m ("6D) in font nullfont!
Missing character: There is no f ("66) in font nullfont!
Missing character: There is no o ("6F) in font nullfont!
Missing character: There is no r ("72) in font nullfont!
Missing character: There is no v ("76) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no c ("63) in font nullfont!
Missing character: There is no t ("74) in font nullfont!
Missing character: There is no o ("6F) in font nullfont!
Missing character: There is no r ("72) in font nullfont!
Missing character: There is no b ("62) in font nullfont!
Missing character: There is no u ("75) in font nullfont!
Missing character: There is no n ("6E) in font nullfont!
Missing character: There is no d ("64) in font nullfont!
Missing character: There is no l ("6C) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no o ("6F) in font nullfont!
Missing character: There is no f ("66) in font nullfont!
Missing character: There is no r ("72) in font nullfont!
Missing character: There is no a ("61) in font nullfont!
Missing character: There is no n ("6E) in font nullfont!
Missing character: There is no k ("6B) in font nullfont!
Missing character: There is no ( ("28) in font nullfont!
Missing character: There is no G ("47) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no n ("6E) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no r ("72) in font nullfont!
Missing character: There is no a ("61) in font nullfont!
Missing character: There is no l ("6C) in font nullfont!
Missing character: There is no C ("43) in font nullfont!
Missing character: There is no a ("61) in font nullfont!
Missing character: There is no s ("73) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no ) ("29) in font nullfont!
Missing character: There is no ) ("29) in font nullfont!这不是可忽视的警告!
出现问题的语句是要传给overlay unbroken中的\settowidth:
\newcommand{\my@lemma@overlay@unbroken}[2]{
%%============== First ==============%%
\def\rad{7pt}%
\settowidth{\thmtcbtextlen}{\hspace*{10pt}#1.\ \ifdefvoid{\tcbtitletext}{}{(\itshape\tcbtitletext)}} %<-这个问题的一个等价的MWE如下:
\documentclass{article}
\usepackage[most]{tcolorbox}
\newlength{\mylength}
\newcommand\mycmd[1]{%
\settowidth{\mylength}{abcdefg}
\node at (frame.south west) {\the\mylength};
\draw[ultra thick,magenta]
(frame.north west)
--
([xshift=\mylength]frame.north west)
node[right,font=\ttfamily] {#1:\the\mylength}
;
}
\begin{document}
\begin{tcolorbox}[
title=A Simple Box,enhanced,
overlay={\mycmd{A Simple Box}}
]
This is a simple tcolorbox.
\end{tcolorbox}
\newlength{\anotherlength}
\settowidth{\anotherlength}{abcdefg}
\texttt{\the\anotherlength}
\end{document}这个MWE编译会得到如下警告:
Missing character: There is no a in font nullfont!
Missing character: There is no b in font nullfont!
Missing character: There is no c in font nullfont!
Missing character: There is no d in font nullfont!
Missing character: There is no e in font nullfont!
Missing character: There is no f in font nullfont!
Missing character: There is no g in font nullfont!且对宽度的测量是不准确的。

该问题又可以进一步简化为「在tikz环境内不能直接使用\settowidth」:
\documentclass[tikz,border=5pt]{standalone}
\newlength{\mylength}
\begin{document}
\begin{tikzpicture}
\settowidth{\mylength}{abcde}
% \settowidth{\mylength}{\pgfinterruptpicture abcde\endpgfinterruptpicture}
\draw (0,0) -- (\mylength,0) node[above right] {\the\mylength};
\end{tikzpicture}
\end{document}会出现警告:
Missing character: There is no a in font nullfont!
Missing character: There is no b in font nullfont!
Missing character: There is no c in font nullfont!
Missing character: There is no d in font nullfont!
Missing character: There is no e in font nullfont!
解决方法和解释在这里。
不知道是不是:
我想要根据标题长度切换不同的装饰样式,目前无论长度如何都没法切换成功
的一个体现。





















问 tcolorbox盒子的定制问题