FileManager+chckFileSizes.swift

extension FileManager {
    func checkFileSizes(in folderURL: URL) {
        do {
            let resourceKeys: [URLResourceKey] = 
                [.fileSizeKey, .fileAllocatedSizeKey, .isRegularFileKey, .isDirectoryKey]
            for url in try contentsOfDirectory(at: folderURL, 
                                               includingPropertiesForKeys: resourceKeys, 
                                               options: [])
            {
                let resourceValues = try url.resourceValues(forKeys: Set(resourceKeys))

                print("\n\(url.lastPathComponent) resources: \n")
                print("  \(URLResourceKey.fileSizeKey.rawValue): \(resourceValues.fileSize ?? 0)")
                print("  \(URLResourceKey.fileAllocatedSizeKey.rawValue): \(resourceValues.fileAllocatedSize ?? 0)")

                if let isDirectory = resourceValues.isDirectory, isDirectory {
                    checkFileSizes(in: url)
                }
            }
        } catch {
            print("check file size errors: \(error)")
        }

    }
}