Cross-referencing – Referring to Example Numbers in TColorBox in LaTeX

cross-referencingtcolorbox

In a question I asked before, I implemented method 2 by feculededentier. However, now I am facing difficulty in referring to different examples in this case. For example, what should be the Latex code for "as shown in Example 1.2"?

Best Answer

You have to slightly change the definition. Make it 2 arguments with first one as optional:

\newtcolorbox[auto counter, number within=chapter, number freestyle={\noexpand\thechapter.\noexpand\arabic{\tcbcounter}}]{myexample}[2][]{%
    enhanced,
    breakable,
    fonttitle=\bfseries,
    title=Example~\thetcbcounter: #2,
    #1
}

And then use the label=<name> key like

\begin{myexample}[label=second]{Second example}

Now you can use Example~\ref{second} to refer to these boxes.

Full example (taken and modified from the answer linked in the question)

\documentclass{book}
\usepackage{tcolorbox}
    \tcbuselibrary{skins,breakable}
\usepackage{lipsum}

\newtcolorbox[auto counter, number within=chapter, number freestyle={\noexpand\thechapter.\noexpand\arabic{\tcbcounter}}]{myexample}[2][]{%
    enhanced,
    breakable,
    fonttitle=\bfseries,
    title=Example~\thetcbcounter: #2,
    #1
}

\begin{document}

\chapter{First chapter}

\begin{myexample}[label=first]{First example}
  \lipsum[4]
\end{myexample}

\begin{myexample}[label=second]{Second example}
  \lipsum[4]
\end{myexample}

\chapter{Second chapter}

\begin{myexample}[label=third]{Third example}
  \lipsum[4]
\end{myexample}

From Example~\ref{second} we get some idea.

\end{document}

enter image description here

cleveref version:

You can load cleveref package and use crefname in the options to reduce typing.

\documentclass{book}
\usepackage{cleveref}
\usepackage{tcolorbox}
    \tcbuselibrary{skins,breakable}
\usepackage{lipsum}

\newtcolorbox[auto counter, number within=chapter, 
    crefname={example}{examples},
    Crefname={Example}{Examples},
    number freestyle={\noexpand\thechapter.\noexpand\arabic{\tcbcounter}}]
    {myexample}[2][]{%
    enhanced,
    breakable,
    fonttitle=\bfseries,
    title=Example~\thetcbcounter: #2,    
    #1
}

\begin{document}

\chapter{First chapter}

\begin{myexample}[label=first]{First example}
  \lipsum[4]
\end{myexample}

\begin{myexample}[label=second]{Second example}
  \lipsum[4]
\end{myexample}

\chapter{Second chapter}

\begin{myexample}[label=third]{Third example}
  \lipsum[4]
\end{myexample}

\Cref{second} gives us some idea as seen from \cref{first}.

\end{document}
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