func getFiles() {
   if metaData.resultCount > 0 {
      let files = metaData.results as! [NSMetadataItem]
      for item in files {
         let fileName = item.value(forAttribute: NSMetadataItemFSNameKey) as! String
         if !listOfFiles.contains(where: { $0.name == fileName }) {
            let documentURL = item.value(forAttribute: NSMetadataItemURLKey) as! URL
            listOfFiles.append(FileInfo(name: fileName, url: documentURL))
         }
      }
      listOfFiles.sort(by: { $0.name < $1.name })
   }
}