Iterar elementos / de la carpeta elegida

Puede utilizar un fragmento proporcionado por script Editor:

1. Lanzar script Editor.app
2. Crear un nuevo script
3. Control-Click (o clic derecho) dentro del editor del nuevo script
4. Seleccione Iterar elementos > Imágenes de la carpeta elegida

Esto pegará un fragmento para elegir una carpeta, y luego realizará una tarea en los archivos que coincidan.

He modificado este fragmento y he insertado su código a continuación:

set this_folder to (choose folder with prompt "Pick the folder containing the files to process:") as string
tell application "System Events"
    set these_files to every file of folder this_folder whose name does not start with "." and name extension is "numbers"
end tell
repeat with i from 1 to the count of these_files
    set this_file to (item i of these_files as alias)

    tell application "Numbers"
        set theDoc to open this_file

        set theDocName to name of theDoc

        --I'm assuming that the file name always ends with ".numbers"
        set theName to (characters 1 thru -7 of theDocName) as text

        export theDoc as PDF to file ((theFilesFolder & theName & ".pdf") as text)

        close theDoc

    end tell

end repeat