如何将这些命令整合为一个命令？

Question

我使用下面的代码来突出显示我正在谈论的地方。

\newcommand<>{\hl}[1]{{
        \alt#2{\colorbox{yellow}{#1}}{#1}
}}
\onslide<1->{\hl<1>{when they comeout will in a yellow background color\\}}
\onslide<2->{\hl<2>{when they comeout will in a yellow background color\\}}
\onslide<3->{\hl<3>{when they comeout will in a yellow background color\\}}
\onslide<4->{\hl<4>{when they comeout will in a yellow background color}}   

我认为它可以通过一个新命令来简化。
为了整合命令，我尝试了下面的代码：

\newcommand<>{\next}[1]{
 \onslide#2-{\alt#2{\colorbox{yellow}{#1}}{#1}}
}

但效果不太好。

那么，如何将这些命令整合为一个命令？

Answer 1

您可以使用\temporal宏代替\alt，它允许您定义幻灯片前、幻灯片上和幻灯片后的替代方案：

\temporal<⟨overlay specification⟩>{⟨before slide text⟩}{⟨default text⟩}{⟨after slide text⟩}

---

\documentclass{beamer}

\newcommand<>{\hl}[1]{{
   \temporal#2{}{\colorbox{yellow}{#1}}{#1}
}}



\begin{document}
    
\begin{frame}
    \hl<1>{when they comeout will in a yellow background color}
  
  \hl<2>{when they comeout will in a yellow background color}
  
  \hl<3>{when they comeout will in a yellow background color}
  
  \hl<4>{when they comeout will in a yellow background color}   
\end{frame} 
    
\end{document}

---

（略有不同的示例 + 动画）

% https://tex.stackexchange.com/questions/577337
\documentclass{beamer}

% \temporal<⟨overlay specification⟩>{⟨before slide text⟩}{⟨default text⟩}{⟨after slide text⟩}
\newcommand<>{\myOwnCommand}[1]{{
   \temporal#2{}{\colorbox{yellow}{#1}}{#1}
}}

\begin{document}
    
\begin{frame}
\frametitle{Frame Title}
\begin{itemize}[<+->]
    \item \myOwnCommand<1>{when they come out will be in a yellow background color}
    \item \myOwnCommand<2>{when they come out will be in a yellow background color}
    \item \myOwnCommand<3>{when they come out will be in a yellow background color}
\end{itemize}
\end{frame}
    
\end{document}