How to get the user’s current location in Swift 4.2

View Controller

import UIKit
import MessageUI
import CoreLocation

class ViewController: UIViewController, MFMailComposeViewControllerDelegate, CLLocationManagerDelegate {
    
    @IBOutlet weak var lat: UITextField!
    
    @IBOutlet weak var long: UITextField!
    
    
    // Used to start getting the users location
    let locationManager = CLLocationManager()
    var timer = Timer()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        locationManager.delegate = self

        // For use when the app is open
        locationManager.requestWhenInUseAuthorization()
        
        // If location services is enabled get the users location
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest // You can change the locaiton accuary here.
        locationManager.startUpdatingLocation()
        
        var latitude: Double? {
            if let text = lat.text {
                return Double(text)
            } else {
                return nil
            }
        }
        
        var longitude: Double? {
            if let text = long.text {
                return Double(text)
            } else {
                return nil
            }
        }
        
        timer.invalidate()   // just in case you had existing `Timer`, `invalidate` it before we lose our reference to it
        timer = Timer.scheduledTimer(withTimeInterval: 5.0, repeats: true) { [weak self] _ in
            
        }
        
    }
    
    // Print out the location to the console
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        if let location = locations.first {
            //print(location.coordinate.latitude)
            self.lat.text = "\(location.coordinate.latitude)"
            self.long.text = "\(location.coordinate.longitude)"
        }
    }
    
    // If we have been deined access give the user the option to change it
    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        if(status == CLAuthorizationStatus.denied) {
            showLocationDisabledPopUp()
        }
    }
    
    // Show the popup to the user if we have been denied access
    func showLocationDisabledPopUp() {
        let alertController = UIAlertController(title: "Background Location Access Disabled",
                                                message: "In order to submit offline report you need to enable your location services.",
                                                preferredStyle: .alert)
        
        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
        alertController.addAction(cancelAction)
        
        let openAction = UIAlertAction(title: "Open Settings", style: .default) { (action) in
            if let url = URL(string: UIApplication.openSettingsURLString) {
                UIApplication.shared.open(url, options: convertToUIApplicationOpenExternalURLOptionsKeyDictionary([:]), completionHandler: nil)
                
            }
        }
        alertController.addAction(openAction)
        
        self.present(alertController, animated: true, completion: nil)
    }
    
    func grabit() {
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.requestWhenInUseAuthorization()
        locationManager.startUpdatingLocation();
        
        print(self.lat.text ?? 0)
        print(self.long.text ?? 0)
}
    
    override func viewDidAppear(_ animated: Bool) {
        
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
}

// Helper function inserted by Swift 4.2 migrator.
fileprivate func convertToUIApplicationOpenExternalURLOptionsKeyDictionary(_ input: [String: Any]) -> [UIApplication.OpenExternalURLOptionsKey: Any] {
    return Dictionary(uniqueKeysWithValues: input.map { key, value in (UIApplication.OpenExternalURLOptionsKey(rawValue: key), value)})
}

Source code:

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