Swift：获取当前用户坐标并将其存储到变量中

Question

我目前正在尝试获取用户的当前坐标，并最终将这些值存储到变量中。

我创建了以下类来定义用户的当前位置并设置函数以提取数据。

import Foundation
import CoreLocation

class MyCurrentCoordinate: NSObject {


     private var currentLocation: CLLocation!

     var myLatitude = 0.0
     var myLongitude = 0.0
     var myAltitude = 0.0

     override init() {
         super.init()
     }

     func getLat() {
         myLatitude = currentLocation.coordinate.latitude
     }

     func getLong() {
         myLongitude = currentLocation.coordinate.longitude
     }

     func getAlt() {
         myAltitude = currentLocation.altitude
     }
}

这不会显示任何错误。但是，当我去调用任何函数（getLat，getLong或getAlt）提取部分用户位置数据时，由于值nil，应用程序崩溃。是否有人对未通过实际用户纬度，经度或海拔高度有任何见解？

我已更新位置权限和info.plist，以允许用户授予位置跟踪权限。

Answer 1

您可以使用CLLocationManager

1. [添加应用程序功能，您可以像打开源代码一样打开info.plist并添加：

   <key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
   <string>App requires allways tracking</string>
   <key>NSLocationAlwaysUsageDescription</key>
   <string>App requires background tracking</string>
   <key>NSLocationWhenInUseUsageDescription</key>
   <string>App requires tracking when be in use</string>
   
   <key>UIBackgroundModes</key>
   <array>
       <string>fetch</string>
       <string>location</string>
       <string>remote-notification</string>
   </array>
   

2. 询问授权，例如locationManager.requestAlwaysAuthorization（）并管理是否具有正确的访问权限... CLLocationManager.authorizationStatus（）== .authorizedAlways

   import CoreLocation
   
   class ViewController: UIViewController, CLLocationManagerDelegate {
       var locationManager: CLLocationManager?
   
       override func viewDidLoad() {
           super.viewDidLoad()
   
           locationManager = CLLocationManager()
           locationManager?.delegate = self
           locationManager?.requestAlwaysAuthorization()
           if CLLocationManager.authorizationStatus() == .authorizedAlways {
               locationManager.allowsBackgroundLocationUpdates = true
               locationManager.pausesLocationUpdatesAutomatically = false
               locationManager.desiredAccuracy = kCLLocationAccuracyBest
               locationManager.startUpdatingLocation()
           }
           if CLLocationManager.authorizationStatus() == .authorizedWhenInUse {
               locationManager.allowsBackgroundLocationUpdates = false
               locationManager.pausesLocationUpdatesAutomatically = true
               locationManager.desiredAccuracy = kCLLocationAccuracyBest
               locationManager.startUpdatingLocation()
           }
       }
   }
   
   extension ViewController: CLLocationManagerDelegate {
   
       public func locationManager(_: CLLocationManager, didUpdateLocations locations: [CLLocation]){
           guard let location = locations.first else { return }
           print(location)
   
       }
   
       public func locationManager(_: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
           switch status {
           case .notDetermined:
               print("Autorization status did change \(status)")
           case .authorizedWhenInUse:
               print("Autorization status did change \(status)")
           case .authorizedAlways:
               print("Autorization status did change \(status)")
           case .restricted:
               print("Autorization status did change \(status)")
           case .denied:
               print("Autorization status did change \(status)")
           @unknown default:
               fatalError()
           }
       }
   }
   

3. 不要忘记在某个地方停止它locationManager.stopUpdatingLocation（）