So in my current project
Im doing a method which calculates the saved emission when driving a moped compared to a average car. The function contains two parts, the method
(the calculation) and the tracker function
. The main problem is that the tracker function somehow does not seem to track at all.
My main question is, how do I get the tracker function to always track while the app is on?
This is the tracker function
var startLocation:CLLocation!
var lastLocation: CLLocation!
var traveledDistance:Double = 0
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if startLocation == nil {
startLocation = locations.first
} else {
if let lastLocation = locations.last {
let distance = startLocation.distanceFromLocation(lastLocation)
let lastDistance = lastLocation.distanceFromLocation(lastLocation)
traveledDistance += lastDistance
print( "\(startLocation)")
print( "\(lastLocation)")
print("FULL DISTANCE: \(traveledDistance)")
print("STRAIGHT DISTANCE: \(distance)")
var travelDistance = setData("distance")
}
}
lastLocation = locations.last
}
And this is the method
func calculateEmission(numbers: Int...) -> Double{
let recordedDistance = getData("distance")
let dis = recordedDistance
let emissionAve = 0.16
let calculatedEmission : Double = Double(dis) * Double(emissionAve)
print(calculatedEmission, "kg Co2")
return calculatedEmission
}
Make sure you have the following in your info.plist. Then you should get prompted to allow access to the location services.
<key>NSLocationAlwaysUsageDescription</key>
<string>Needs access to access GPS</string>
<key>NSLocationUsageDescription</key>
<string>Needs access to access GPS</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>Needs access to access GPS</string>
You should have some thing like this in viewDidLoad.
override func viewDidLoad() {
self.locationManager.requestWhenInUseAuthorization()
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
locationManager.startUpdatingLocation()
}
}