Beamer: How to reference something other than a frame

Question

I tried a type of reference that works with classic LaTeX article but that I can't get it to work in a beamer presentation.

MWE:

\documentclass{beamer}
\usepackage[ansinew]{inputenc}
\usetheme{Warsaw}
\newcounter{theo}
\newcommand{\theo}{  \refstepcounter{theo} \textbf{Théorème    \arabic{theo}}  }

%\resetcounteronoverlays{theo}
\newcommand{\thm}[1]{
\begin{block}{\theo}
#1
\end{block}
}

\begin{document}

\begin{frame}
Hello world
\end{frame}

\begin{frame}

\thm{\label{th1}
My first theorem
}
\end{frame}

\begin{frame}
As precised in Theorem \ref{th1}
\end{frame} 

\end{document}

In the last frame I get: As precised in Theorem 2

where I'm looking for : As precised in Theorem 1

Any idea to fix that?

Answer 1

You'll get automatic theorem numbering for free from beamer:

\documentclass{beamer}

\usepackage[T1]{fontenc}         
\usepackage[utf8]{inputenc} 


\usetheme{Warsaw}
\setbeamertemplate{theorems}[numbered]

\usepackage[french]{babel}
\uselanguage{French}
\languagepath{French}
\deftranslation[to=French]{Theorem}{Th\'eor\`eme}


\begin{document}

\begin{frame}
Hello world
\end{frame}

\begin{frame}
  \begin{theorem}
    \label{th1}
        My first theorem
  \end{theorem}
\end{frame}

\begin{frame}
As precised in Theorem \ref{th1}
\end{frame} 
\end{document}