CLLocationCoordinates from locationManager didUpdateLocations - ios

Question

I am trying to use CoreLocation (once permission is granted) to get a user's CLLocationCoordinate2D, so that I can pass that information to an Uber deeplink (after a UIButton within my TableView is pressed).
I've figured out how to get the coordinates as CLLocations, and turn them into CLLocationCoordinates2D in the didUpdateLocations method, but can't seem to transfer them over to my buttonPressed function.
Can anyone explain how I can properly transfer the coordinates info to the uberButtonPressed method? I am also confused about how to get the locationManager to stop updating location once a suitable location is determined. Any help is much appreciated. By the way I am using this to instantiate Uber: https://github.com/kirby/uber
import UIKit
import CoreLocation
import MapKit
class ATableViewController: UITableViewController, CLLocationManagerDelegate {
let locationManager = CLLocationManager()
var location: CLLocation?
var coordinate: CLLocationCoordinate2D?
// Implemented tableView methods etc here...
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
let newLocation = locations.last as! CLLocation
println("DID UPDATE LOCATIONS \(newLocation)")
location = newLocation
coordinate = location!.coordinate
println("WE HAVE THE COORDINATES \(coordinate!.latitude) and \(coordinate!.longitude)") // this prints along with DID UPDATE LOCATIONS
}
func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
println("error:" + error.localizedDescription)
}
func uberButtonPressed(sender: UIButton!) {
let senderButton = sender
println(senderButton.tag)
let authStatus: CLAuthorizationStatus = CLLocationManager.authorizationStatus()
if authStatus == .NotDetermined {
locationManager.requestWhenInUseAuthorization()
return
}
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.startUpdatingLocation()
}
var pickupLocation = coordinate! // fatal error: unexpectedly found nil while unwrapping an Optional value
println(pickupLocation)
// // Create an Uber instance
// var uber = Uber(pickupLocation: pickupLocation)
//
// Set a few optional properties
// uber.pickupNickname = "OK"
//
// uber.dropoffLocation = CLLocationCoordinate2D(latitude: 47.591351, longitude: -122.332271)
// uber.dropoffNickname = "whatever"
//
// // Let's do it!
// uber.deepLink()
//
}

Answer 1

You should move var pickupLocation = coordinate! into your didUpdateLocations. Once assigned, you can call locationManager.stopUpdatingLocation() also from inside 'didUpdateLocation or your value for coordinate with keep updating. After stopping the locationManager, call a NEW function to run the rest of your code currently in func uberButtonPressed

Answer 2

I had the same problem.
Instead of calling the delegate method like this:
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
debugPrint("NOT CALLED-- didUpdateLocations AnyObject")
}
I changed into:
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
debugPrint("CALLED-- didUpdateLocations CLLocation")
}

Answer 3

The problem is that you are unwrapping coordinate which is a CLLocationCoordinate2D? with a !. Since coordinate is from location which is a CLLocation?. It is possible that coordinate is nil and location is nil, especially before location services have had a chance to kick in. Only run the rest of uberButtonPressed: for the case where coordinate and location are not nil by using if let currentCoordinate = coordinate?, and in that case, call locationManager.stopUpdatingLocation().