在投影机中将图形对齐到顶部

Question

我有几个框架，其中包含相同大小但不同长度的标题。我目前使用的代码如下：

\begin{frame}
    \begin{figure}[!ht]
        \centering
        \includegraphics[width=0.7\textwidth]{image1}
        \caption{xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx}
    \end{figure}    
\end{frame}

\begin{frame}
    \begin{figure}[!ht]
        \centering
        \includegraphics[width=0.7\textwidth]{image2}    
        \caption{xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxx}
    \end{figure}
\end{frame}

结果是两个图形在各自的框架内不在同一个位置：第一个图形的上边距比第二个图形的上边距更宽。

我怎样才能将这些图形对齐到顶部，以便它们在每一帧中占据相同的空间？

Answer 1

添加 \ vfill` 似乎可以解决问题：

\documentclass[demo]{beamer}
\usepackage{caption}

\begin{document}

\begin{frame}
  \begin{figure}[!ht]
        \centering
        \includegraphics[width=0.7\textwidth]{image1}
   \caption{xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx}
 \end{figure}
\vfill\null
\end{frame}

\begin{frame}
 \begin{figure}[!ht]
        \centering
        \includegraphics[width=0.7\textwidth]{image2}
        \caption{xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxx}
 \end{figure}
\end{frame}

\end{document} 

Answer 2

根据您想要实现的确切输出，您还可以将选项添加[t]到环境中frame：

\documentclass[demo]{beamer}
\usepackage{caption}

\begin{document}

\begin{frame}[t]
  \begin{figure}
        \centering
        \includegraphics[width=0.7\textwidth]{image1}
   \caption{xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx}
 \end{figure}

\end{frame}

\begin{frame}[t]
 \begin{figure}
        \centering
        \includegraphics[width=0.7\textwidth]{image2}
        \caption{xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                 xxxxxxxxxxxxxxxxxxx}
 \end{figure}
\end{frame}

\end{document}