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

In current thread a solution was proposed without delegate but in Xcode 9.1 testing in simulator it did not work, location was nil. This code worked:

 import UIKit
 import MapKit

class ViewController: UIViewController, CLLocationManagerDelegate {

var locationManager: CLLocationManager!

override func viewDidLoad() {
    super.viewDidLoad()

    if (CLLocationManager.locationServicesEnabled())
    {
        locationManager = CLLocationManager()
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.requestAlwaysAuthorization()
        locationManager.startUpdatingLocation()
    }
}

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
{

    let location = locations.last! as CLLocation

    /* you can use these values*/
    let lat = location.coordinate.latitude
    let long = location.coordinate.longitude
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


}

Answer 2

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 <T> {
      case .Success(T)
      case .Failure(ErrorType)
    }

    static let shared: Locator = Locator()

    typealias Callback = (Result <Locator>) -> Void

    var requests: Array <Callback> = Array <Callback>()

    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 <Callback>()
        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 <CLLocation>) {
        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):
    /* ... */
  }
}

Answer 3

In Swift

import UIKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {

    //Labels outlets

    @IBOutlet var localityTxtField: UITextField!
    @IBOutlet var postalCodeTxtField: UITextField!
    @IBOutlet var aAreaTxtField: UITextField!
    @IBOutlet var countryTxtField: UITextField!

    let locationManager = CLLocationManager()

    //View Didload

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

     //Button Location

    @IBAction func findMyLocation(_ sender: AnyObject) {
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
        locationManager.requestWhenInUseAuthorization()
        locationManager.startUpdatingLocation()
    }

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        CLGeocoder().reverseGeocodeLocation(manager.location!, completionHandler: {(placemarks, error)->Void in

            if (error != nil) {
                print("Reverse geocoder failed with error" + (error?.localizedDescription)!)
                return
            }

            if (placemarks?.count)! > 0 {

                print("placemarks",placemarks!)
                let pm = placemarks?[0]
                self.displayLocationInfo(pm)
            } else {
                print("Problem with the data received from geocoder")
            }
        })
    }

    func displayLocationInfo(_ placemark: CLPlacemark?) {
        if let containsPlacemark = placemark {

            print("your location is:-",containsPlacemark)
            //stop updating location to save battery life
            locationManager.stopUpdatingLocation()
            let locality = (containsPlacemark.locality != nil) ? containsPlacemark.locality : ""
            let postalCode = (containsPlacemark.postalCode != nil) ? containsPlacemark.postalCode : ""
            let administrativeArea = (containsPlacemark.administrativeArea != nil) ? containsPlacemark.administrativeArea : ""
            let country = (containsPlacemark.country != nil) ? containsPlacemark.country : ""

            localityTxtField.text = locality
            postalCodeTxtField.text = postalCode
            aAreaTxtField.text = administrativeArea
            countryTxtField.text = country
        }

    }


    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
          print("Error while updating location " + error.localizedDescription)
    }
}

Answer 4

IMHO, you are over complicating your code when the solution you are looking is pretty simple.

I have done it by using the following code:

First create an instance of CLLocationManager and Request Authorization

var locManager = CLLocationManager()
locManager.requestWhenInUseAuthorization()

then check if the user allowed authorization.

var currentLocation: CLLocation!

if 
   CLLocationManager.authorizationStatus() == .authorizedWhenInUse ||
   CLLocationManager.authorizationStatus() ==  .authorizedAlways
{         
    currentLocation = locManager.location        
}

to use it just do this

label1.text = "\(currentLocation.coordinate.longitude)"
label2.text = "\(currentLocation.coordinate.latitude)"

Your idea of setting them to the label.text is correct, however the only reason I can think of is that the user is not giving you permission and that is why your current Location data will be nil.

However you would need to debug and tell us that. Also the CLLocationManagerDelegate is not necessary.

Hopefully this helps. Ask away if you have doubts.

Answer 5

For Swift 3:

First you need to set allowance to receive User's GPS in the info.plist.

Set: NSLocationWhenInUseUsageDescription with a random String. And/or: NSLocationAlwaysUsageDescription with a random String.

Then:

import UIKit
import MapKit

class ViewController: UIViewController {

    var locManager = CLLocationManager()
    var currentLocation: CLLocation!

    override func viewDidLoad() {
        super.viewDidLoad()
        locManager.requestWhenInUseAuthorization()

        if (CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedWhenInUse ||
            CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedAlways){
            guard let currentLocation = locManager.location else {
                return
            }
            print(currentLocation.coordinate.latitude)
            print(currentLocation.coordinate.longitude)
        }
    }
}

Done.

Answer 6

I agree with Kevin above, but if you're looking for less code for something simpler the following will suffice: Make sure to use the CLLocationManagerDelegate

Swift 4:

In viewDidLoad you can add the following

 locationManager.requestWhenInUseAuthorization()


if (CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedWhenInUse) || (CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedAlways) {

            currentLocation = locationManager.location
            print(currentLocation.coordinate.latitude)
            print(currentLocation.coordinate.longitude)

        }

    }

And for the first request respond once the user gives or denies permission:

 func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {

            if status == .authorizedWhenInUse {

                locationManager.requestLocation()
                currentLocation = locationManager.location
                print(currentLocation.coordinate.latitude)
                print(currentLocation.coordinate.longitude)
                //Process location information and update.

    }