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我正在關注下面的代碼，我從堆棧溢出問題中複製並轉換了這些代碼。在iOS中確定互聯網速度的正確方法8
我正在上網速度但是我不確定，如果我正在做正確的事情。
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.
}
}
我從下面的URL複製了代碼。它在Objective C中，所以我轉換了代碼！
How to detect Network Signal Strength in iOS Reachability
嗯...複製不理解？您首先必須瞭解計算互聯網速度的邏輯。 – Raptor
我理解了邏輯...沒有它，我怎麼可以轉換和更改代碼在迅速!!! LOL – Saty
我的問題是在判斷MegabytesPerSecond（）方法中的數據轉換，我認爲我得到的數據在哪種形式？ 在客觀的c例子中，它將長度與經過時間分開，然後用1024除以得到mb/sec，但是我沒有得到它 – Saty