How to get current longitude and latitude using CLLocationManager-Swift

Question

I want to get the current longitude and latitude of a location using Swift and display them via labels. I tried to do this but nothing displays on the labels.

Answer 1

Despite other advice you should use the CLLocationManagerDelegate to safely retrieve a location (without using it you may get null locations when the location manager doesn't have enough time to update). I strongly recommend wrapping the location manager code within a static shared helper (something along these lines):

class Locator: NSObject, CLLocationManagerDelegate {
    enum Result  {
      case .Success(T)
      case .Failure(ErrorType)
    }

    static let shared: Locator = Locator()

    typealias Callback = (Result ) -> Void

    var requests: Array  = Array ()

    var location: CLLocation? { return sharedLocationManager.location  }

    lazy var sharedLocationManager: CLLocationManager = {
        let newLocationmanager = CLLocationManager()
        newLocationmanager.delegate = self
        // ...
        return newLocationmanager
    }()

    // MARK: - Authorization

    class func authorize() { shared.authorize() }
    func authorize() { sharedLocationManager.requestWhenInUseAuthorization() }

    // MARK: - Helpers

    func locate(callback: Callback) {
        self.requests.append(callback)
        sharedLocationManager.startUpdatingLocation()
    }

    func reset() {
        self.requests = Array ()
        sharedLocationManager.stopUpdatingLocation()
    }

    // MARK: - Delegate

    func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {
        for request in self.requests { request(.Failure(error)) }
        self.reset()
    }

    func locationManager(manager: CLLocationManager, didUpdateLocations locations: Array ) {
        for request in self.requests { request(.Success(self)) }
        self.reset()
    }

}

Then in view did load (or anywhere else you need to get the current location) run:

Locator.shared.locate { result in
  switch result {
  case .Success(locator):
    if let location = locator.location { /* ... */ }
  case .Failure(error):
    /* ... */
  }
}