update: Xcode 8.3.2 • Swift 3.1
The problem there is because you are always getting the same location over and over again. Try like this:
import UIKit
import MapKit
class ViewController: UIViewController, CLLocationManagerDelegate {
@IBOutlet weak var mapView: MKMapView!
let locationManager = CLLocationManager()
var startLocation: CLLocation!
var lastLocation: CLLocation!
var startDate: Date!
var traveledDistance: Double = 0
override func viewDidLoad() {
super.viewDidLoad()
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
locationManager.startMonitoringSignificantLocationChanges()
locationManager.distanceFilter = 10
mapView.showsUserLocation = true
mapView.userTrackingMode = .follow
}
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if startDate == nil {
startDate = Date()
} else {
print("elapsedTime:", String(format: "%.0fs", Date().timeIntervalSince(startDate)))
}
if startLocation == nil {
startLocation = locations.first
} else if let location = locations.last {
traveledDistance += lastLocation.distance(from: location)
print("Traveled Distance:", traveledDistance)
print("Straight Distance:", startLocation.distance(from: locations.last!))
}
lastLocation = locations.last
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
if (error as? CLError)?.code == .denied {
manager.stopUpdatingLocation()
manager.stopMonitoringSignificantLocationChanges()
}
}
}