在箭頭（不低於/高於）與邊緣節點之間插入標籤，tikz

Question

我想繪製一個帶箭頭的圖形，並且希望箭頭的標籤位於行之間（不在上面或下面）像這樣： 輸出應該如何：

我正在使用tikz庫和邊緣節點繪製兩個節點之間的箭頭。 這是一個小例子，用箭頭上面的標籤：

\documentclass[12pt]{article} 
\usepackage[letterpaper, margin=1in, top=2.5cm, bottom=2.5cm]{geometry} 
\usepackage{xcolor} 
\definecolor{corn}{rgb}{0.98, 0.93, 0.36} 
\definecolor{emerald}{rgb}{0.31, 0.78, 0.47} 

\usepackage{array} 
\usepackage{tikz} 
\usepackage{siunitx} 
\usepackage{float} 
\usepackage{subcaption,caption} 
\captionsetup{labelsep=period} 
\usetikzlibrary{positioning,patterns,arrows,decorations.markings,decorations.pathreplacing,shapes,shapes.misc} 
\tikzset{ 
    %Define standard arrow tip 
    >=stealth', 
     % Define arrow style 
    pil/.style={ 
      ->, 
      thick, 
      shorten <=3pt, 
      shorten >=3pt,} 
} 

\title{ } 
\begin{document} 
\maketitle 

\begin{figure}[h!] 
\centering 
\caption{} 
\label{paths} 
\begin{subfigure}{0.9\textwidth} 
\resizebox{.9\textwidth}{!}{ 
\begin{tikzpicture}[shorten >=2pt,on grid,auto] 
\node (A) [draw=black,fill=emerald,double=white,double distance=2pt,shape=rounded rectangle,minimum width=4cm ]{A}; 
\node[right=9cm of A] (B) [draw,fill=corn,shape=rounded rectangle,minimum width=4cm ]{B}; 
\path[->] 
    (A) edge[line width=0.742mm] node[ anchor=center, above, pos=0.5,font=\bfseries] {\Huge +} (B); 
    \end{tikzpicture} 
} 
\caption{} 
\label{M1w} 
\end{subfigure} 
\end{figure} 

\end{document}%\grid 

我在網上搜索，但沒有找到與邊緣節點的任何實例。我真的很感激任何幫助！

Answer 1

更改如下\路徑似乎這樣的伎倆：

\path[->] (A) edge[line width=0.742mm] node[ fill=white, anchor=center, pos=0.5,font=\bfseries] {\Huge +} (B);