Right way of determining internet speed in iOS 8

Question

I am following the below code which I copied and converted from a stack overflow question.

I am getting internet speed however I am not sure, If I am doing right thi

Answer 1

You code snippet was taken from this answer. I've updated it to use NSURLSession. The Swift rendition is below:

class ViewController: UIViewController, NSURLSessionDelegate, NSURLSessionDataDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        testDownloadSpeedWithTimout(5.0) { (megabytesPerSecond, error) -> () in
            print("\(megabytesPerSecond); \(error)")
        }
    }

    var startTime: CFAbsoluteTime!
    var stopTime: CFAbsoluteTime!
    var bytesReceived: Int!
    var speedTestCompletionHandler: ((megabytesPerSecond: Double?, error: NSError?) -> ())!

    /// Test speed of download
    ///
    /// Test the speed of a connection by downloading some predetermined resource. Alternatively, you could add the
    /// URL of what to use for testing the connection as a parameter to this method.
    ///
    /// - parameter timeout:             The maximum amount of time for the request.
    /// - parameter completionHandler:   The block to be called when the request finishes (or times out).
    ///                                  The error parameter to this closure indicates whether there was an error downloading
    ///                                  the resource (other than timeout).
    ///
    /// - note:                          Note, the timeout parameter doesn't have to be enough to download the entire
    ///                                  resource, but rather just sufficiently long enough to measure the speed of the download.

    func testDownloadSpeedWithTimout(timeout: NSTimeInterval, completionHandler:(megabytesPerSecond: Double?, error: NSError?) -> ()) {
        let url = NSURL(string: "http://insert.your.site.here/yourfile")!

        startTime = CFAbsoluteTimeGetCurrent()
        stopTime = startTime
        bytesReceived = 0
        speedTestCompletionHandler = completionHandler

        let configuration = NSURLSessionConfiguration.ephemeralSessionConfiguration()
        configuration.timeoutIntervalForResource = timeout
        let session = NSURLSession(configuration: configuration, delegate: self, delegateQueue: nil)
        session.dataTaskWithURL(url).resume()
    }

    func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveData data: NSData) {
        bytesReceived! += data.length
        stopTime = CFAbsoluteTimeGetCurrent()
    }

    func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?) {
        let elapsed = stopTime - startTime
        guard elapsed != 0 && (error == nil || (error?.domain == NSURLErrorDomain && error?.code == NSURLErrorTimedOut)) else {
            speedTestCompletionHandler(megabytesPerSecond: nil, error: error)
            return
        }

        let speed = elapsed != 0 ? Double(bytesReceived) / elapsed / 1024.0 / 1024.0 : -1
        speedTestCompletionHandler(megabytesPerSecond: speed, error: nil)
    }

}

Answer 2

Here is the updated code in Swift 4.0

class SpeedTest: UIViewController, URLSessionDelegate, URLSessionDataDelegate {


    typealias speedTestCompletionHandler = (_ megabytesPerSecond: Double? , _ error: Error?) -> Void

    var speedTestCompletionBlock : speedTestCompletionHandler?

    var startTime: CFAbsoluteTime!
    var stopTime: CFAbsoluteTime!
    var bytesReceived: Int!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        checkForSpeedTest()

    }

    func checkForSpeedTest() {

        testDownloadSpeedWithTimout(timeout: 5.0) { (speed, error) in
            print("Download Speed:", speed ?? "NA")
            print("Speed Test Error:", error ?? "NA")
        }

    }

    func testDownloadSpeedWithTimout(timeout: TimeInterval, withCompletionBlock: @escaping speedTestCompletionHandler) {

        guard let url = URL(string: "https://images.apple.com/v/imac-with-retina/a/images/overview/5k_image.jpg") else { return }

        startTime = CFAbsoluteTimeGetCurrent()
        stopTime = startTime
        bytesReceived = 0

        speedTestCompletionBlock = withCompletionBlock

        let configuration = URLSessionConfiguration.ephemeral
        configuration.timeoutIntervalForResource = timeout
        let session = URLSession.init(configuration: configuration, delegate: self, delegateQueue: nil)
        session.dataTask(with: url).resume()

    }

    func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, didReceive data: Data) {
        bytesReceived! += data.count
        stopTime = CFAbsoluteTimeGetCurrent()
    }

    func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {

        let elapsed = stopTime - startTime

        if let aTempError = error as NSError?, aTempError.domain != NSURLErrorDomain && aTempError.code != NSURLErrorTimedOut && elapsed == 0  {
            speedTestCompletionBlock?(nil, error)
            return
        }

        let speed = elapsed != 0 ? Double(bytesReceived) / elapsed / 1024.0 / 1024.0 : -1
        speedTestCompletionBlock?(speed, nil)

    }

}