ios - 如何通过单击 uibutton 获取标签中的用户纬度和经度

Question

我正在尝试使用反向 CLgeocoding 来获取用户当前位置的纬度和经度。但是，我认为方法没有被调用。至少我没有在控制台中得到任何结果。如果有人帮助我做到这一点，那就太好了。提前致谢。

import UIKit
import CoreLocation

class ViewController: UIViewController,CLLocationManagerDelegate {

    @IBOutlet weak var lbl2: UILabel!
    @IBOutlet weak var lbl1: UILabel!
    var str1: Double?
    var str2: Double?

    var locationManager:CLLocationManager!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.
    }

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

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
       determineMyCurrentLocation()

    }


    func determineMyCurrentLocation() {
        locationManager = CLLocationManager()
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.requestAlwaysAuthorization()

        if CLLocationManager.locationServicesEnabled() {
            locationManager.startUpdatingLocation()
            //locationManager.startUpdatingHeading()
        }
    }

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

            if (error != nil) {
                print("ERROR:" + error!.localizedDescription)

                return
            }

            if (placemarks?.count)! > 0 {
                let pm = placemarks![0] as CLPlacemark
                self.displayLocationInfo(placemark: pm)
            } else {
                print("Error with data")

            }
        })
    }
    func displayLocationInfo(placemark: CLPlacemark) {
        //  self.locationManager.stopUpdatingLocation()

        print(placemark.locality)
        print(placemark.postalCode)
        print(placemark.administrativeArea)
        print(placemark.country)
        print(placemark.location)

    }

    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error)
    {
        print("Error \(error)")
    }

    @IBAction func currentadd(_ sender: Any) {


    }

Answer 1

首先确保您已在 Info.plist 中添加了其中一个键

NSLocationAlwaysUsageDescription 或 NSLocationWhenInUseUsageDescription。

其次，您需要在 viewDidLoad 或 viewDidAappear 中调用 defineMyCurrentLocation 方法。您还可以根据需要从任何按钮或事件调用 defineMyCurrentLocation。

Edit

我想建议的另一件事是，如果您不想经常使用位置服务，您应该在 didUpdateLocations 中调用 manager.stopUpdatingLocation()。

更新方法

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        if let managerLocation = manager.location{
            CLGeocoder().reverseGeocodeLocation(managerLocation) { (placemarks, error) in
                if let locations = placemarks ,let location = locations.first {
                    self.displayLocationInfo(placemark: location)
                }else if let error = error{
                    print("ERROR:" + error.localizedDescription)
                }
            }
        }
 }