Why isn't locationManager didUpdateLocation working? - ios

Question

With CoreLocation.Foundation added to the BuildPhase and imported at the top of the file, I can get location information if I put the following into a view controller with a button:
#IBAction func locationButton(sender: AnyObject) {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
}
It goes on to locationManager didUpdateLocations with a CLGeocoder().reverseGeocodeLocation completionHandler that displays the location info in another function - this works.
BUT, it doesn't work when I try to transfer this same code in my data model. I set up the model with the following:
import CoreLocation
class Record: NSObject, CLLocationManagerDelegate
{
let locationManager = CLLocationManager()
Because there's no button, I've put the locationManager code into:
override init()
{
iD = NSUUID().UUIDString
super.init()
if (CLLocationManager.locationServicesEnabled())
{
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
self.locationManager.requestWhenInUseAuthorization()
switch CLLocationManager.authorizationStatus() {
case .AuthorizedWhenInUse, .AuthorizedAlways:
locationManager.startUpdatingLocation()
case .NotDetermined:
locationManager.requestWhenInUseAuthorization() // or request always if you need it
case .Restricted, .Denied:
print("tell users that they need to enable access in settings")
default:
break
}
print("Location services available")
if CLLocationManager.authorizationStatus() == .NotDetermined
{
print("Still Not Determined")
}
} else { print("Location services not available") }
}
I get 'Location services available'. But the following code never prints anything to console, nor does it call the function toSetLocationStamped.
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!)
{
print("started location man")
CLGeocoder().reverseGeocodeLocation(manager.location, completionHandler: //pass the location co-ordinates
{
(placemarks, error) -> Void in
if (error != nil)
{
println("Reverse geocoder failed with error" + error.localizedDescription)
return
}
if placemarks.count > 0 //process the location array (placemarks)
{
let pm = placemarks[0] as! CLPlacemark
self.toSetLocationStamped(pm)
print("got here")
} else
{
println("Problem receiving data from geocoder")
}
})
}
If I put a deinit the class Record, with a simple print log, there is no output.
deinit
{
print("deinit")
}
I'm initializing a dummyRecord: Record from a required init in MasterViewController class:
class MasterViewController: UITableViewController
{
var records = [Record]()
var subjectDescription: String?
// weak var delegate: MonsterSelectionDelegate? // property for object conforming to MSDelegate
required init(coder aDecoder: NSCoder) // // coder because class is loaded from Storyboard
{
super.init(coder: aDecoder)
var dummyRecord1 = Record()
dummyRecord1.details = "All was very good and strong with a little bit of lemon on the side of the hill."
dummyRecord1.dateTimeEntered = NSDate(dateString: "2015-07-22")
dummyRecord1.subject = "Clouds"
dummyRecord1.locationEntered = "Drittelsgasse 1, 69493 Großsachsen, Germany."
dummyRecord1.photos.append(UIImage(named: "zombies.jpg")!)
records.append(dummyRecord1)
}

Answer 1

After you call
self.locationManager.requestWhenInUseAuthorization()
you cannot immediately start updating location. That call is asynchronous.
Here is how you should properly do it:
1) Check the authorisation status:
switch CLLocationManager.authorizationStatus() {
case .AuthorizedWhenInUse, .AuthorisedAlways:
locationManager.startUpdatingLocation()
case .NotDetermined:
locationManager.requestWhenInUseAuthorization() // or request always if you need it
case .Restricted, .Denied:
// tell users that they need to enable access in settings
default:
break
}
2) If you have previously authorised your app this should update location. However, if you didn't a popup will appear. In order to respond to the change in the authorisation status you need to add another function:
func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
if (status == .AuthorizedAlways) || (status == .AuthorizedWhenInUse) {
locationManager.startUpdatingLocation()
}
}