Completion in Updating Location Manager - swift

Question

I'm having an issue with the Update Location Manager.
So this is what i want to do. When the user goes into the view, it asks for location permision, when the user refuses i have set up a code that i will not post here cause it works. But if he accepts i run a function that i get the latitude and longitude of his. And then i want to run a function in which i do a query to an API. The following code is what I made
var tolat: Double = 0.0
var tolon: Double = 0.0
let locationManager = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
locationManager.startUpdatingLocation()
}
getData() { result in
switch result {
case .Success: self.eventsTable.reloadData()
case .Failure(let error): break
}
}
}
func getData(completion: Resulty<Void> -> Void) {
print("the lat \(tolat) and the lon \(tolon)")
completion(.Success())
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let locValue:CLLocationCoordinate2D = manager.location!.coordinate
tolat = locValue.latitude
tolon = locValue.longitude
locationManager.stopUpdatingLocation()
}
and after the end of the view
enum Resulty<T> {
case Success(T)
case Failure(NSError)
}
So it prints 0.0 the latitude and longitude. How can i make the func getData run when the Location Latitude and Longitude actually has data???