迅速的位置归零

Question

This code was functioning earlier, and now it keeps crashing because the location is coming back as nil. I'm not sure where this error is coming from or how to fix it. From what I can tell, my code is correct. Any help?

import UIKit
import CoreLocation
import MapKit

class LocationController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {

    var locationManager = CLLocationManager()

    @IBOutlet var Map: MKMapView!

    var manager:CLLocationManager!
    var myLocations: [CLLocation] = []

        override func viewDidLoad()
        {
            super.viewDidLoad()

            self.Map.mapType = MKMapType.Standard
            self.Map.showsUserLocation = true

            //self.Map.removeAnnotations(self.theMap.annotations)

            locationManager.delegate = self
            locationManager.desiredAccuracy = kCLLocationAccuracyBest
            locationManager.requestAlwaysAuthorization()
            locationManager.startUpdatingLocation()


            let location = self.locationManager.location

            var latitude: Double = location.coordinate.latitude
            var longitude: Double = location.coordinate.longitude

            println("current latitude :: \(latitude)")
            println("current longitude :: \(longitude)")
        }

Answer 1

The location property of CLLocationManager is declared as:

@NSCopying var location: CLLocation! { get }

and thus your let location could be filled with a nil value. Perhaps this declaration changed recently as Apple scrubs their interfaces related to optionals.

You'll need to bind your latitude and longitude while respecting a possible nil .