Centering doesn't work for figure with tabularx

Question

I have a figure with 3 images in it, searching TeX I found out that the best way to accomplish that was with a tabularx inside a figure, like this:

\begin{figure}[t]
\centering
\def\tabularxcolumn#1{m{#1}}
\begin{tabularx}{\linewidth}{c}
%
  \begin{tabular}{ccc}
    \subfloat[Opciones de mensaje]{\includegraphics[width=3cm,type=png,ext=.png,read=.png,angle=0]{imagenes/pantalla11}} 
    & \subfloat[Confirmación de eliminar (Android)]{\includegraphics[width=3cm,type=png,ext=.png,read=.png,angle=0]{imagenes/pantalla12}}
    & \subfloat[Confirmación de eliminar (iOS)]{\includegraphics[width=3cm,type=png,ext=.png,read=.png,angle=0]{imagenes/iOSelim}}\\
  \end{tabular}
\end{tabularx}

\caption{Pantalla de Buzón con opciones de mensaje. Elaboración propia.}\label{fig:pantallaMulti2}
\end{figure}

It shows the multiple figures, but the whole figure is positioned to the left, not the center, like is ignoring the \centering instruction.

Any ideas? First time I use LaTex.

Answer 1

Another option using subfig.

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[spanish]{babel}
\usepackage{subfig,graphicx}
\begin{document}

\begin{figure}

\subfloat[Opciones de mensaje]{\includegraphics[width=3cm]{example-image-a}} 
\hfill
\subfloat[Confirmación de eliminar (Android)]{\includegraphics[width=3cm]{example-image-b}}
\hfill
\subfloat[Confirmación de eliminar (iOS)]{\includegraphics[width=3cm]{example-image-c}}

\caption{Pantalla de Buzón con opciones de mensaje. Elaboración propia.}\label{fig:pantallaMulti2}

\end{figure}

\end{document} 

As stated by @egreg, you're overcomplicating things. You can just put the figures one beside another and \hfill will distribute them horizontally.

Answer 2

You're overcomplicating things: you don't need tabularx at all, because as you're using it it's just for getting a normal paragraph as wide as the normal text width.

Also the subcaptions should be aligned, which is much easier using subcaption instead of subfig (that's recommended only in some special cases) and its \subcaptionbox command.

There's no need to specify everytime type=png,ext=.png,read=.png,angle=0, because LaTeX will pick up a PNG file if it finds it by the specified name.

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[spanish]{babel}

\usepackage{graphicx}
\usepackage{subcaption}

\usepackage{lipsum} % for mock text

\begin{document}

\lipsum[2]

\begin{figure}[htp]
\centering

\subcaptionbox{Opciones de mensaje}{%
  \includegraphics[width=3cm]{example-image}%
}\quad
\subcaptionbox{Confirmación de eliminar (Android)}{%
  \includegraphics[width=3cm]{example-image-9x16}%
}\quad
\subcaptionbox{Confirmación de eliminar (iOS)}{%
  \includegraphics[width=3cm]{example-grid-100x100bp}%
}

\caption{Pantalla de Buzón con opciones de mensaje. Elaboración propia.}
\label{fig:pantallaMulti2}

\end{figure}

\lipsum[3]

\end{document}