How to find size of a file before downloading it in iOS 7?

Question

Wanted to find size of a file on some server before downloading it in iOS 7... I have a method of NSURLConnectionDelegate but it is deprecated after iOS 4.3

Here was

Answer 1

Also using URlSession you can get the file size like this without downloading actual data:

func getPdfSize(for url: URL) {
    var request = URLRequest(url: url)
    request.httpMethod = "HEAD"

    URLSession.shared.dataTask(with: request) { [weak self] (_, response, _) in
        if let response = response {
            let size = response.expectedContentLength
            DispatchQueue.main.async {
                self?.fileSizeLabel.text = ByteCountFormatter.string(fromByteCount: size, countStyle: .file)
            }
        }
    }.resume()
}

Notice also you can use the native iOS ByteCountFormatter to format the byte count into a readable string.

Code in Swift 5