路径中的中心箭头

Question

我怎样才能将箭头放置在边缘的中心？

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{automata,positioning}
\usepackage{tkz-graph}
\usetikzlibrary{decorations.markings}

\tikzset{->-/.style={decoration={
  markings,
  mark=at position #1 with {\arrow{>}}},postaction={decorate}}}

\begin{document}
\begin{tikzpicture}[shorten >=1pt,node distance=4cm,on grid,auto] 
   \node[state] (s_0)   {$s_0$}; 
   \node[state] (s_1) [right=of s_0]  {$s_1$}; 

    \path[->]
    (s_0) edge  node {0} (s_1)
    (s_1) edge [bend right=45] node [above] {1} (s_0)
    ;
\end{tikzpicture}
\end{document} 

针对这个问题给出了几个很好的答案\draw，例如Tikz：箭头位于中心但应用相同的机制会\path出现错误：“我无法装饰空路径”

Answer 1

只需将选项添加[->-=.5]到边缘即可，如下所示：

\documentclass{article}    
\usepackage{tikz}
\usetikzlibrary{automata,positioning}
\usetikzlibrary{decorations.markings}

\tikzset{->-/.style={decoration={
  markings,
  mark=at position #1 with {\arrow{>}}},postaction={decorate}}}

\begin{document}

\begin{tikzpicture}[shorten >=1pt,shorten <=1pt,node distance=4cm,on grid,auto] 
  \node[state] (s_0)   {$s_0$}; 
  \node[state] (s_1) [right=of s_0]  {$s_1$};     
  \path
    (s_0) edge[->-=.5]  node {0} (s_1)
    (s_1) edge [bend right=45,->-=.5] node [above] {1} (s_0);
\end{tikzpicture}

\end{document}