在iOS 8中确定互联网速度的正确方法 [英] Right way of determining internet speed in iOS 8
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问题描述
我正在按照以下代码复制并从堆栈溢出问题转换。
I am following the below code which I copied and converted from a stack overflow question.
我正在上网速度但是我不确定,如果我在做正确的事情。
I am getting internet speed however I am not sure, If I am doing right thing.
import UIKit
class ViewController: UIViewController, NSURLConnectionDataDelegate{
var connection:NSURLConnection!
var length:Int!
var startTime:NSDate!
//let kMinimumMegabytesPerSecond: CGFloat = 1
let kMaximumElapsedTime: CGFloat = 2.0
override func viewDidLoad() {
super.viewDidLoad()
self.testDownloadSpeed()
// Do any additional setup after loading the view, typically from a nib.
}
func testDownloadSpeed() {
var url: NSURL = NSURL(string: "http://thewallpaperhost.com/wp-content/uploads/2014/12/wallpapers-hd-8000-8331-hd-wallpapers.jpg")!
var request: NSURLRequest = NSURLRequest(URL: url)
self.startTime = NSDate()
self.length = 0
self.connection = NSURLConnection(request: request, delegate: self)
self.connection.start()
let delayInSeconds:Int64 = 1000000000 * 2
var popTime:dispatch_time_t = dispatch_time(DISPATCH_TIME_NOW, (Int64)(delayInSeconds ))
dispatch_after(popTime, dispatch_get_main_queue(), {() -> Void in
if let conn = self.connection {
self.connection.cancel()
self.connection = nil
self.useOffline()
}
})
}
func determineMegabytesPerSecond() -> CGFloat {
var elapsed: NSTimeInterval
if (startTime != nil) {
elapsed = NSDate().timeIntervalSinceDate(startTime)
var d = (Double(length) / elapsed)
var result = CGFloat( d/1024)
result = result * 0.0078125
result = result * 0.0009765625
return result
}
return -1
}
func useOnline() {
NSLog("Successful")
NSLog("\(determineMegabytesPerSecond())")
}
func useOffline() {
NSLog("UnSuccessful")
NSLog("\(determineMegabytesPerSecond())")
}
func connection(connection: NSURLConnection, didReceiveResponse response: NSURLResponse) {
NSLog("data came")
self.startTime = NSDate()
}
func connection(connection: NSURLConnection, didFailWithError error: NSError) {
if let conn = self.connection {
self.connection = nil
useOffline()
}
}
func connectionDidFinishLoading(connection: NSURLConnection) {
self.connection = nil
useOnline()
}
func connection(connection: NSURLConnection, didReceiveData data: NSData) {
self.length = self.length + data.length
NSLog("\(data.length)")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
我复制了以下网址的代码。它是在Objective C中所以我转换了代码!
I copied the code from below URL. It was in Objective C so I converted the code!
推荐答案
您的代码段取自此答案。我已将其更新为使用 NSURLSession
。 Swift的演绎如下:
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)
}
}
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