icons = try! fileManager.contentsOfDirectory(at: assetURL, includingPropertiesForKeys: [URLResourceKey.nameKey, URLResourceKey.isDirectoryKey], options: .skipsHiddenFiles)

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "iconCell", for: indexPath)
    let iconItem = icons[indexPath.row]

    // Configure the cell
    var imageView: UIImageView
    let image = UIImage(named: "Images.bundle/(iconItem.lastPathComponent)")?.resizeImage(newWidth: CGFloat(32)).withRenderingMode(.alwaysTemplate)

    iconNames.append(iconItem.lastPathComponent)

    imageView = UIImageView(image: image)
    imageView.tintColor = .black
    imageView.contentMode = .scaleToFill

    cell.contentView.addSubview(imageView)

    return cell
}