How To Get Directory Size With Swift On OS X

Question

I am trying to get the size of a directory, as well as it\'s content on OS X using Swift. So far, I have only been able to get the size of the directory itself, with none of

Answer 1

For anyone looking for the barebones implementation (works the same on macOS and iOS):

Swift 5 barebones version

extension URL {
    var fileSize: Int? { // in bytes
        do {
            let val = try self.resourceValues(forKeys: [.totalFileAllocatedSizeKey, .fileAllocatedSizeKey])
            return val.totalFileAllocatedSize ?? val.fileAllocatedSize
        } catch {
            print(error)
            return nil
        }
    }
}

extension FileManager {
    func directorySize(_ dir: URL) -> Int? { // in bytes
        if let enumerator = self.enumerator(at: dir, includingPropertiesForKeys: [.totalFileAllocatedSizeKey, .fileAllocatedSizeKey], options: [], errorHandler: { (_, error) -> Bool in
            print(error)
            return false
        }) {
            var bytes = 0
            for case let url as URL in enumerator {
                bytes += url.fileSize ?? 0
            }
            return bytes
        } else {
            return nil
        }
    }
}

Usage

let fm = FileManager.default
let tmp = fm.temporaryDirectory

if let size = fm.directorySize(tmp) {
    print(size)
}

What makes this barebones: doesn't precheck if a directory is a directory or a file is a file (returns nil either way), and the results are returned in their native format (bytes as integers).