ios - 如何使用CLLocationManager-Swift获取当前经纬度

Question

我想使用 Swift 获取某个位置的当前经度和纬度，并通过标签显示它们。我尝试这样做，但标签上没有任何显示。

import UIKit
import CoreLocation
class ViewController: UIViewController, CLLocationManagerDelegate{

    @IBOutlet weak var longitude: UILabel!
    @IBOutlet weak var latitude: UILabel!
    let locationManager = CLLocationManager()

    override func viewDidLoad() {
        super.viewDidLoad()
        if (CLLocationManager.locationServicesEnabled()) {
            locationManager.delegate = self
            locationManager.desiredAccuracy = kCLLocationAccuracyBest
            locationManager.requestWhenInUseAuthorization()
            locationManager.startUpdatingLocation()
        } else {
            println("Location services are not enabled");
        }
    }

    // MARK: - CoreLocation Delegate Methods

    func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
         locationManager.stopUpdatingLocation()
         removeLoadingView()
         if (error) != nil {
             print(error)
          }
     }

    func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
        var locationArray = locations as NSArray
        var locationObj = locationArray.lastObject as CLLocation
        var coord = locationObj.coordinate
        longitude.text = coord.longitude
        latitude.text = coord.latitude
        longitude.text = "\(coord.longitude)"
        latitude.text = "\(coord.latitude)"
    }
}

Answer 1

恕我直言，当您寻找的解决方案非常简单时，您的代码过于复杂了。

我是用下面的代码完成的:

首先创建一个CLLocationManager实例并请求授权

var locManager = CLLocationManager()
locManager.requestWhenInUseAuthorization()

然后检查用户是否允许授权。

var currentLocation: CLLocation!

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

要使用它，只需这样做

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

您将它们设置为 label.text 的想法是正确的，但我能想到的唯一原因是用户未授予您权限，这就是为什么您当前的位置数据将是零。

但是您需要调试并告诉我们。 CLLocationManagerDelegate 也不是必需的。

希望这对您有所帮助。如果您有疑问，请提出。