Fetching image files from all sub folders within a folder

I am using following code to fetch the files in a folder. However my folder does contain some subfolders that also contain images. How can I fetch all the possible .jpg files in subfolders too.

    directory = uigetdir();
    files = dir(fullfile(directory, '*.jpg'));

I have also tried, it doesnt list any file

function files = getFilesFromDirectory(mainSelectedFolder)

files = [];
folderNamesList = {};
filenames = [];

mainIndex = 0;
% Fetchign all possible sub folders
subFoldersList = genpath(mainSelectedFolder);
while true
  [subfolder, subFoldersList] = strtok(subFoldersList, ';');
  if isempty(subfolder)
    break;
  end
  folderNamesList = [folderNamesList subfolder];
end

for x = 1 : length(folderNamesList)
    selectedFolder = folderNamesList{x};
    pngFiles = sprintf('%s/*.png', selectedFolder);
  filenames = dir(pngFiles);
    filePattern = sprintf('%s/*.jpg', selectedFolder);
  filenames = [filenames; dir(filePattern)];      
    imagesCount = length(filenames);  
  if imagesCount >= 1
        % fetching the full path names
    for y = 1 : imagesCount
      fullFileName = fullfile(selectedFolder, filenames(y).name);
      files(mainIndex) = fullFileName;
    end
  end
end

[Stephen23]

@Muhammad Umar: what version of MATLAB are you using?

[Muhammad Umar]

Please check the edits, i am using 2o18

Answer 1

[Walter Roberson]

 files = dir(fullfile(directory, '**', '*.jpg'));

This requires 2016ish (I would need to investigate the exact release)

Answer 2

[Image Analyst]

Or you could try imageDataStore().