Swift3 如何使用swift中的CLLocationManager从当前位置获取经纬度？

我是

Swift

新手，我想从当前位置获取

纬度和经度。使用这些
纬度和经度
通过在
Swift-3
的UITextField中获取城市和国家名称，自动填充
UITextField
。提前感谢。
请尝试以下选项：

import Foundation
import CoreLocation

class LocationViewController : UIViewController {
    @IBOutlet weak var txtField: UITextField!
    var locationManager = CLLocationManager()
    override func viewDidLoad()
    {
        super.viewDidLoad()
        self.getCurrentAddress { currentAddress, error in
            if let address = currentAddress, let city = address["City"] as? String, let country = address["Country"] as? String  {
                self.txtField.text = "\(city), \(country)"
            }
        }
    }

    func getCurrentAddress(completion: @escaping (_ currentAddress: [String:Any]?, _ error: Error?) -> ()) {
        var currentLocation: CLLocation!
        let authStatus = CLLocationManager.authorizationStatus()

        self.locationManager.requestWhenInUseAuthorization()
        if authStatus == CLAuthorizationStatus.authorizedWhenInUse || authStatus == CLAuthorizationStatus.authorizedAlways {
            currentLocation = locationManager.location
            let longi = currentLocation.coordinate.longitude
            let lat = currentLocation.coordinate.latitude
            let geoCoder = CLGeocoder()
            geoCoder.reverseGeocodeLocation(currentLocation) { placemarks, error in
                if let e = error {
                    completion(nil, e)
                } else {
                    let placeArray = placemarks
                    let placeMark = (placeArray?[0])!

                    guard let currentAddress = placeMark.addressDictionary as? [String:Any] else {
                        return
                    }
                    completion(currentAddress, nil)
                }
            }
        }
    }
}

需要在plist文件中设置
nsLocationWhenUsageDescription
我将尝试@Vini App，并使用上面的代码@Vini App更新答案，让您知道我将在哪里获得lat long。请检查我将检查您的更新答案，并让您知道@Vini app使用了您的代码，但应用程序在此行“let longi=currentLocation.coordinate.longitude”@Vini app崩溃