Ios 通过Swift 2和CLLocation获得速度

我尝试在Swift 2中制作一个显示所有GPS信息的应用程序。 我可以恢复纬度、长度、水平精度、垂直精度、高度、距离和帽子，但我无法恢复速度，而我到达了目标C：-(

谢谢你的帮助

下面是我的代码：

import UIKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {

var running = false
var pause = false
var locationManager: CLLocationManager = CLLocationManager()
var startLocation: CLLocation!

@IBOutlet weak var latitudeLabel: UILabel!
@IBOutlet weak var longitudeLabel: UILabel!

@IBOutlet weak var horizontalAccuracyLabel: UILabel!
@IBOutlet weak var verticalAccuracyLabel: UILabel!

@IBOutlet weak var capLabel: UILabel!
@IBOutlet weak var altitudeLabel: UILabel!


@IBOutlet weak var partielLabel: UILabel!
@IBOutlet weak var distanceLabel: UILabel!

@IBOutlet weak var vitesseLabel: UILabel!
@IBOutlet weak var moyenneLabel: UILabel!
@IBOutlet weak var timerLabel: UILabel!
@IBOutlet weak var totalDistanceLabel: UILabel!


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

    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.delegate = self
    locationManager.requestWhenInUseAuthorization()
    locationManager.startUpdatingLocation()
    locationManager.startUpdatingHeading()
    startLocation = nil
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func startDistance(sender: AnyObject) {
    startLocation = nil
    running = true
}

@IBAction func stopDistance(sender: AnyObject) {
    running = false
}

@IBAction func resetDistance(sender: AnyObject) {
    startLocation = nil
}


func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
{
    let latestLocation: AnyObject = locations[locations.count - 1]

    latitudeLabel.text = String(format: "%.4f",latestLocation.coordinate.latitude)
    longitudeLabel.text = String(format: "%.4f",latestLocation.coordinate.longitude)

    horizontalAccuracyLabel.text = String(format: "%.4f",latestLocation.horizontalAccuracy)
    verticalAccuracyLabel.text = String(format: "%.4f",latestLocation.verticalAccuracy)

    altitudeLabel.text = String(format: "%.4f",latestLocation.altitude)

    if running == true {
        if startLocation == nil {
            startLocation = latestLocation as! CLLocation
        }

        let distanceBetween: CLLocationDistance =
        latestLocation.distanceFromLocation(startLocation)

        distanceLabel.text = String(format: "%.2f", distanceBetween)
    }
}

func locationManager(manager: CLLocationManager, didUpdateHeading newHeading: CLHeading)
{
    capLabel.text = String(format: "%.4f",newHeading.magneticHeading)
}


func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {

}

}

我测试了这段代码：

vitesseLabel.text = String(CLLocationSpeed())

---

但是速度保持在0.00

你不知道速度的原因是你没有写任何代码，在那里你问CLLocation的

速度

你不知道速度的原因是你没有写任何代码，在那里你问CLLocation的

速度

我终于找到了，下面是代码：

var speed: CLLocationSpeed = CLLocationSpeed()
speed = locationManager.location!.speed
vitesseLabel.text = String(format: "%.0f km/h", speed * 3.6)

---

我终于找到了，下面是代码：

var speed: CLLocationSpeed = CLLocationSpeed()
speed = locationManager.location!.speed
vitesseLabel.text = String(format: "%.0f km/h", speed * 3.6)

---

你只需要在一个开放的位置通过步行或跑步进行测试。然后你就可以得到速度。你只需要在一个开放的位置通过步行或跑步进行测试。然后你就可以得到速度。你在第一行分配变量，然后在第二行覆盖它。那么分配的目的是什么？你在第二行分配变量第一行然后在第二行覆盖它。那么分配的目的是什么呢？