ios - CLLocationManager 返回 Nil 值

Question

我正在尝试使用 CLLocationManager 以两个坐标的形式返回用户位置。

• 我认为我拥有适当的授权 (authorizedWhenInUse)，但在获取实际位置时它返回 nil。

• 我还将 NSLocationWhenInUseUsageDescription 添加到我的 plist

  import UIKit
  import CoreLocation    
  class ViewController: UIViewController, CLLocationManagerDelegate {  
  // Create an instance of the CLLocationManager
      var locManager = CLLocationManager()
  
  // View did load function (run things inside of here)
  override func viewDidLoad() {
      super.viewDidLoad()
      // Do any additional setup after loading the view, typically from a nib.
  
      locManager.delegate = self
      locManager.desiredAccuracy = kCLLocationAccuracyBest
  
      // Check authorizationStatus
      let authorizationStatus = CLLocationManager.authorizationStatus()
      // List out all responses
      switch authorizationStatus {
      case .AuthorizedAlways:
          println("authorized")
      case .AuthorizedWhenInUse:
          println("authorized when in use")
      case .Denied:
          println("denied")
      case .NotDetermined:
          println("not determined")
      case .Restricted:
          println("restricted")
      }
  
      // Get the location
      locManager.startUpdatingLocation()
  
      if( CLLocationManager.authorizationStatus() == CLAuthorizationStatus.AuthorizedWhenInUse){
          // Extract the location from CLLocationManager
          let userLocation = locManager.location
  
          // Check to see if it is nil
          if userLocation != nil {
              println("location is \(userLocation)")
          } else {
              println("location is nil")
          }
      } else {
          println("not authorized")
      }
  
      }
  }
  
  override func didReceiveMemoryWarning() {
      super.didReceiveMemoryWarning()
      // Dispose of any resources that can be recreated.
  }
  

Answer 1

SDK 中的 CLLocationManager.h 头文件提供了有关“.location”属性的有用提示:

Discussion:
 *      The last location received. Will be nil until a location has been received.

最好的办法是实现:

optional func locationManager(_ manager: CLLocationManager,
       didUpdateLocations locations: [CLLocation])

委托(delegate)方法并从那里获取您的位置，当设备的 GPS 解析手机所在位置时调用该方法。

类似于:

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [AnyObject]!) {

    let userLocation = manager.location

    print("location = \(userLocation.latitude) \(userLocation.longitude)")

  }