练习与解答之间的超链接

Question

在撰写包含练习和解决方案的讲义时，我想创建从练习到其解决方案的超链接，反之亦然。我使用包框架，超链接和答案（出于某些原因，我至少希望坚持前两个）。下面的例子几乎满足了我的要求。然而，从练习到其解决方案的超链接现在是姓名（“练习”）的练习，而我希望它是它的数字(“1”）。我该如何实现这一点？

\documentclass{book}

\usepackage{answers}
\usepackage{hyperref}
\usepackage[framemethod=tikz]{mdframed}

\Newassociation{sol}{answ}{ans}\Opensolutionfile{ans}

\mdtheorem{ex}{\hyperlink{ex:\theex}{Exercise}\hypertarget{sol:\theex}{}}
\renewenvironment{answ}[1]{{\hypertarget{ex:#1}{}\hyperlink{sol:#1}{#1}}\quad}{}

\begin{document}

\begin{ex}
This is an exercise.
\begin{sol}
This is the solution.
\end{sol}
\end{ex}

\Closesolutionfile{ans}
\input{ans}

\end{document}

Answer 1

另一个建议是使用xsim而answers不是使用您的要求mdframed：

\documentclass{book}

\usepackage[framemethod=tikz]{mdframed}
\usepackage{xsim}
\usepackage{hyperref}

\DeclareExerciseEnvironmentTemplate{myex}{%
  \begin{mdframed}[%
    frametitle={%
      \hypertarget{ex:\ExerciseID}{\XSIMmixedcase{\GetExerciseName}}
      \hyperlink{sol:\ExerciseID}{\GetExerciseProperty{counter}}%
    }]%
}{\end{mdframed}}

\DeclareExerciseEnvironmentTemplate{mysol}{%
  \par\noindent
  \hyperlink
    {ex:\ExerciseID}
    {\hypertarget{sol:\ExerciseID}{\GetExerciseProperty{counter}}}%
  \quad
}{\par}

\xsimsetup{
  exercise/template = myex ,
  solution/template = mysol ,
  print-solutions/headings = false
}

\begin{document}

\begin{exercise}
  This is an exercise.
\end{exercise}
\begin{solution}
  This is the solution.
\end{solution}
\begin{exercise}
  This is another exercise.
\end{exercise}
\begin{solution}
  This is the other solution.
\end{solution}

\printsolutions

\end{document}

如果您稍后想要切换到tcolorbox，则只需要更改模板定义myex：

\DeclareExerciseEnvironmentTemplate{myex}{%
  \begin{tcolorbox}[sharp corners, colback = white]
    \textbf{%
      \hypertarget{ex:\ExerciseID}{\XSIMmixedcase{\GetExerciseName}}
      \hyperlink{sol:\ExerciseID}{\GetExerciseProperty{counter}}%
    }\par\smallskip
}{\end{tcolorbox}}

也可以定义环境ex，sol如果您坚持使用这些名称：

使用选项加载包blank，它现在没有定义exercise和solution

\usepackage[blank]{xsim}

并定义ex和sol：

\DeclareExerciseType {exercise} {
  exercise-env      = ex ,
  solution-env      = sol ,
  exercise-name     = \XSIMtranslate {exercise} ,
  exercises-name    = \XSIMtranslate {exercises} ,
  solution-name     = \XSIMtranslate {solution} ,
  solutions-name    = \XSIMtranslate {solutions} ,
  exercise-template = myex ,
  solution-template = mysol
}

正如现在只需要在上面的例子中设置选项\xsimsetup{print-solutions/headings = false}并且可以改变环境：

\begin{ex}
  This is an exercise.
\end{ex}
\begin{sol}
  This is the solution.
\end{sol}
\begin{ex}
  This is another exercise.
\end{ex}
\begin{sol}
  This is the other solution.
\end{sol}

Answer 2

尽管您想坚持使用，但mdframed我建议使用tcolorbox因为它可以提供mdframed+answer行为。此解决方案也用于hyperref链接。

例如answers，tcolorbox提供一些命令和环境来定义带有零件的盒子，这些零件将保存在外部文件中并在稍后打印。

下面的代码是示例的简化版tcolorbox文档中的第 8.3 节（可以看到类似的东西这里）

每个ex框都会将解决方案（之后的文本\tcblower）保存到一个独立的文件中。

命令\tcbstartrecording[file1]将开始保存file1要纳入解决方案列表的所有练习的名称。

命令\tcbstoprecording按照其所说的去做。

命令\tcbinputrecords[file1]加载所有解决方案并打印它们。

关于参考，我假设每个练习都包含一个解决方案，并且它们各自的名称都是对其解决方案/练习的引用。

\documentclass{article}

\usepackage[most]{tcolorbox}
\usepackage{hyperref}

\NewTColorBox[auto counter]{ex}{+O{}}{%
        enhanced, colframe=black, colback=white, sharp corners, 
        attach title to upper=\par, coltitle=black, fonttitle=\bfseries,
        title={Exercise~\ref{solution@\thetcbcounter}},
        label={exercise@\thetcbcounter},
        lowerbox=ignored,
        savelowerto=solutions/exercise-\thetcbcounter.tex,
        record={\string\solution{\thetcbcounter}%
               {solutions/exercise-\thetcbcounter.tex}},
        #1}

\NewTotalTColorBox[auto counter]{\solution}{mm}{%
        enhanced, blanker,             
        coltitle=black, fonttitle=\bfseries,
        title={\ref{exercise@\thetcbcounter}},
        label={solution@\thetcbcounter},
        attach title to upper={\ },
        }{\input{#2}}

\begin{document}

% We start to record all `tcblower` parts in file `file1` for later processing 
\tcbstartrecording[file1]

%Every exercise box contains an upper part which is processed and
%printed and a lower (solution) which printing is delayed.
%
\begin{ex}
This is an exercise.
\tcblower
This is the solution for first exercise
\end{ex}

\begin{ex}
This is an exercise.
\tcblower
This is the solution for second exercise
\end{ex}

\tcbstoprecording

%previous recorded files with solutions are processed and printed
\tcbinputrecords[file1]

\end{document}

Answer 3

您可以\theex在 的开头mdtheorem使用startcode选项重新定义：

\documentclass{book}

\usepackage{answers}
\usepackage{hyperref}
\usepackage[framemethod=tikz]{mdframed}

\Newassociation{sol}{answ}{ans}\Opensolutionfile{ans}

\mdtheorem[startcode={\let\theexold\theex\renewcommand{\theex}{\hyperlink{ex:\theexold}{\theexold}\hypertarget{sol:\theexold}{}}}]{ex}{Exercise}
\renewenvironment{answ}[1]{{\hypertarget{ex:#1}{}\hyperlink{sol:#1}{#1}}\quad}{}

\begin{document}
    
    \begin{ex}
        This is an exercise.
        \begin{sol}
            This is the solution.
        \end{sol}
    \end{ex}
    
    \begin{ex}
        This is an exercise.
        \begin{sol}
            This is the solution.
        \end{sol}
    \end{ex}
    \Closesolutionfile{ans}
    \input{ans}
    
\end{document}