Network Speed Test Playground

testSpeed.swift

import Foundation
import PlaygroundSupport

PlaygroundPage.current.needsIndefiniteExecution = true
URLCache.shared = URLCache(memoryCapacity: 0, diskCapacity: 0, diskPath: nil)

func testSpeed(completion: ((Float?) -> Void)?) {
  guard let url = URL(string: "http://ipv4.download.thinkbroadband.com/5MB.zip") else {
    completion?(nil)
    return
  }
  let request = URLRequest(url: url)
  let startTime = Date()

  let task = URLSession.shared.dataTask(with: request) { (data, resp, error) in
    guard error == nil && data != nil && resp != nil else {
      completion?(nil)
      return
    }
    guard let contentLength = data?.count else {
      completion?(nil)
      return
    }

    let length = Float(contentLength)
    let elapsed = Float(Date().timeIntervalSince(startTime))
    let speed = length / elapsed / (1024 * 1024) // MBps
    completion?(speed)
  }
  task.resume()
}


testSpeed { speed in
  if let speed = speed {
    print("Network speed: \(speed) MBps")
  } else {
    print("Couldn't measure network speed")
  }
  PlaygroundPage.current.finishExecution()
}