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iOS

Posted by Eric Whittaker
Eric Whittaker
2,974 Points

CoreLocation Project - Print My Location

team,

I cant quite figure out why this code doesn't print my location in the output area of XCode. I can get it to prompt to look for my location in the iOs sim, but after that, nothing. Any help?

import UIKIT
import MapKit
import CoreLocation

class ViewController: UIViewController ,CLLocationManagerDelegate{


    //  @IBOUTLET weak var map: MKMapView!

    let manager = CLLocationManager()

    override func viewDidLoad() {
        super.viewDidLoad()

        // for use in foreground

        if CLLocationManager.authorizationStatus() == .NotDetermined {
            manager.requestWhenInUseAuthorization()
        }
    }

    func locationManager (manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {

        if status == .Authorized ||  status == .AuthorizedWhenInUse {
            manager.startUpdatingLocation()
        }

        var locValue: CLLocationCoordinate2D = manager.location.coordinate

        println("locations = \(locValue.latitude) \(locValue.longitude)")

    }

3 Answers

Michael Hulet
Michael Hulet
47,913 Points
Michael Hulet
Michael Hulet
47,913 Points

At the point where you're trying to print your location, the CLLocationManager hasn't had the chance to get it yet. However, said manager can tell you when it has a new location to give you. It does this with another delegate function, in which you should put your printing code, like this:

func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!){
    manager.stopUpdatingLocation()
    let currentLocation = locations.last as CLLocation
    println("\(currentLocation.coordinate.latitude), \(currentLocation.coordinate.longitude)")
}

In order to receive these messages, you also need to make sure that the you're the delegate for the CLLocationManager object you set up. You'd do that like this:

//This goes in your viewDidLoad function
manager.delegate = self
Stephen Whitfield
Stephen Whitfield
16,771 Points
Stephen Whitfield
Stephen Whitfield
16,771 Points

So basically you have to make your view controller conform to the CLLocationManager protocol. You set your CLLocation manager, now set the delegate to self. You should be able to access the delegate methods from there.

Bradley Maskell
Bradley Maskell
8,858 Points
Bradley Maskell
Bradley Maskell
8,858 Points

Have you set your CLLocationManagerDelegate? Have you updated your info.plist file to NSLocationAlwaysUsageDescription?