How can I rapidly determine the size of a directory using Swift?

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You can use the FileManager class in Swift to determine the size of a directory:

func calculateDirectorySize(at url: URL) -> Int64 {
    let fileManager = FileManager.default
    var folderSize: Int64 = 0

    guard fileManager.fileExists(atPath: url.path) else { return folderSize }

    do {
        let files = try fileManager.contentsOfDirectory(atPath: url.path)
        for file in files {
            let path = url.appendingPathComponent(file).path
            let attributes = try fileManager.attributesOfItem(atPath: path)
            folderSize += attributes[FileAttributeKey.size] as! Int64
        }
    } catch {
        print("Error while enumerating files \(url.path): \(error.localizedDescription)")
    }

    return folderSize
}

You can call this function with the URL of the directory you want to determine the size of:

let directoryURL = URL(fileURLWithPath: "/Users/Username/Documents/")
let size = calculateDirectorySize(at: directoryURL)
print("Directory size: \(size)")

This function will calculate the total size of all the files within the directory, including any subdirectories.