[Tex/LaTex] How to show the numbering of slides of each frame

beamerbeamer-metropolis

In beamer, when \onlys used, how can I make the page numbers reflect them?

For example,

\documentclass{beamer}

\usetheme[sectionpage=none,progressbar=frametitle]{metropolis}

\begin{document}
\begin{frame}
  \only<1>{
    Slide 1--1
  }
  \only<2>{
    Slide 1--2
  }
\end{frame}

\begin{frame}
  \only<1>{
    Slide 2--1
  }
  \only<2>{
    Slide 2--2
  }
\end{frame}
\end{document}

I would like to have page numbers to be 1--1, 1--2, 2--1, 2--2 on these 4 slides, respectively.

Another example:

\documentclass[12pt,aspectratio=169,usenames,dvipsnames]{beamer}

\usetheme[sectionpage=none,progressbar=frametitle]{metropolis}

\begin{document}
\begin{frame}
  Slide 1
\end{frame}

\begin{frame}
  \textcolor<2>{red}{\color<3,8>{blue} Hi}
\end{frame}

\begin{frame}
  Slide 3
\end{frame}
\end{document}

Slides 1 and 3 should not show the post-dash part.

Best Answer

\documentclass{beamer}

\usetheme[sectionpage=none,progressbar=frametitle]{metropolis}

\newcounter{slideinframe}

\setbeamertemplate{frame numbering}{%
    \ifnum\insertframeendpage>\insertframestartpage
        \setcounter{slideinframe}{\thepage}%
        \addtocounter{slideinframe}{-\insertframestartpage}%
        \addtocounter{slideinframe}{1}%
        \insertframenumber{} -- \theslideinframe%
      \else
        \insertframenumber{}
  \fi%
}

\begin{document}

\begin{frame}
  Slide 1
\end{frame}

\begin{frame}
  \textcolor<2>{red}{\color<3,18>{blue} Hi}
\end{frame}

\begin{frame}
  Slide 3
\end{frame}

\end{document}

With an up-to-date beamer version, the code can be simplified to:

\documentclass{beamer}

\usetheme[sectionpage=none,progressbar=frametitle]{metropolis}

\setbeamertemplate{frame numbering}{%
  \ifnum\insertframeendpage>\insertframestartpage{}
        \insertframenumber{} -- \insertoverlaynumber{}%
  \else
        \insertframenumber{}
  \fi%
}
\makeatother

\begin{document}

\begin{frame}
  Slide 1
\end{frame}

\begin{frame}
  \textcolor<2>{red}{\color<3,18>{blue} Hi}
\end{frame}

\begin{frame}
  Slide 3
\end{frame}

\end{document}
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