写在前面

前阶段做了人生中第一个Beamer演示，总体感觉还不错，就是在TikZ绘制出来的图进行幻灯片切换的时候底栏不显示了，看了一些文档后才知道了问题所在。

问题

下面这个图就是问题所在，底栏直接消失了！？(请忽略我的配色。。)

对应的代码如下

\begin{frame} \frametitle{\heiti 多维标度法的计算过程小结} \begin{tikzpicture} \onslide<1->{ \fill[cyan!20] (-3, 0) arc (90:-90:3); \node [black, font=\LARGE] at (-1.75, -3) {\heiti \begin{tabular}{c} 计 \\ 算 \\ 步 \\ 骤 \end{tabular}}; \draw[gray!30, line width=3pt] (-3, .25) arc (90:-90:3.25); } \onslide<2->{ \fill[color=cyan!30!white] (-.8, -.5) ellipse (.22 and .28) node [black] {1}; \shadedraw[lightgray] (-.25, -.8) rectangle (2.85, -.2) node[right, black] at (-.25, -.5) {\heiti \,确定研究的目的}; } \onslide<3->{ \fill[color=cyan!30!white] (0, -1.5) ellipse (.22 and .28) node [black] {2}; \shadedraw[lightgray] (.8, -1.8) rectangle (4, -1.2) node[right, black] at (.75, -1.5) {\heiti \,\,选择样品和变量}; } \onslide<4->{ \fill[color=cyan!30!white] (.25, -2.5) ellipse (.22 and .28) node [black] {3}; \shadedraw[lightgray] (1, -2.8) rectangle (5.15, -2.2) node[right, black] at (1, -2.5) {\heiti 计算样品间的距离矩阵}; } \onslide<5->{ \fill[color=cyan!30!white] (.25, -3.5) ellipse (.22 and .28) node [black] {4}; \shadedraw[lightgray] (1, -3.8) rectangle (5.15, -3.2) node[right, black] at (1, -3.5) {\heiti 分析样品间的距离矩阵}; } \onslide<6->{ \fill[color=cyan!30!white] (0, -4.5) ellipse (.22 and .28) node [black] {5}; \shadedraw[lightgray] (.75, -4.8) rectangle (4.95, -4.2) node[right, black] at (.75, -4.5) {\heiti 计算距离矩阵的古典解}; } \onslide<7->{ \fill[color=cyan!30!white] (-.8, -5.5) ellipse (.22 and .28) node [black] {6}; \shadedraw[lightgray] (-.25, -5.8) rectangle (3.7, -5.2) node[right, black] at (-.25, -5.5) {\heiti \,检验模型的拟合结果}; } \end{tikzpicture} \end{frame}}

问题解决

原因在那个幻灯片切换的命令\onslide上，只需要将\onslide改成\visible就可以完美显示啦！不过也需要注意这个命令需要有大括号，没有的话可能会报错。

下面再贴上代码

\begin{frame} \frametitle{\heiti 多维标度法的计算过程小结} \begin{tikzpicture} \visible<1->{ \fill[cyan!20] (-3, 0) arc (90:-90:3); \node [black, font=\LARGE] at (-1.75, -3) {\heiti \begin{tabular}{c} 计 \\ 算 \\ 步 \\ 骤 \end{tabular}}; \draw[gray!30, line width=3pt] (-3, .25) arc (90:-90:3.25); } \visible<2->{ \fill[color=cyan!30!white] (-.8, -.5) ellipse (.22 and .28) node [black] {1}; \shadedraw[lightgray] (-.25, -.8) rectangle (2.85, -.2) node[right, black] at (-.25, -.5) {\heiti \,确定研究的目的}; } \visible<3->{ \fill[color=cyan!30!white] (0, -1.5) ellipse (.22 and .28) node [black] {2}; \shadedraw[lightgray] (.8, -1.8) rectangle (4, -1.2) node[right, black] at (.75, -1.5) {\heiti \,\,选择样品和变量}; } \visible<4->{ \fill[color=cyan!30!white] (.25, -2.5) ellipse (.22 and .28) node [black] {3}; \shadedraw[lightgray] (1, -2.8) rectangle (5.15, -2.2) node[right, black] at (1, -2.5) {\heiti 计算样品间的距离矩阵}; } \visible<5->{ \fill[color=cyan!30!white] (.25, -3.5) ellipse (.22 and .28) node [black] {4}; \shadedraw[lightgray] (1, -3.8) rectangle (5.15, -3.2) node[right, black] at (1, -3.5) {\heiti 分析样品间的距离矩阵}; } \visible<6->{ \fill[color=cyan!30!white] (0, -4.5) ellipse (.22 and .28) node [black] {5}; \shadedraw[lightgray] (.75, -4.8) rectangle (4.95, -4.2) node[right, black] at (.75, -4.5) {\heiti 计算距离矩阵的古典解}; } \visible<7->{ \fill[color=cyan!30!white] (-.8, -5.5) ellipse (.22 and .28) node [black] {6}; \shadedraw[lightgray] (-.25, -5.8) rectangle (3.7, -5.2) node[right, black] at (-.25, -5.5) {\heiti \,检验模型的拟合结果}; } \end{tikzpicture} \end{frame}