Swift-核心位置请求权限（如果未授予）

Question

如果用户在第一次被问到时拒绝，是否有任何方法可以要求用户授予位置检测权限？

Answer 1

为了获取用户的当前位置，您需要声明：

let locationManager = CLLocationManager()

在viewDidLoad（）中：

  // Ask for Authorisation from the User.
  self.locationManager.requestAlwaysAuthorization() 

  // For use in foreground
  self.locationManager.requestWhenInUseAuthorization()

  if CLLocationManager.locationServicesEnabled() {
      locationManager.delegate = self
      locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
      locationManager.startUpdatingLocation()
  }

然后在CLLocationManagerDelegate方法中，您可以获取用户的当前位置坐标：

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    var locValue:CLLocationCoordinate2D = manager.location.coordinate
    print("locations = \(locValue.latitude) \(locValue.longitude)")
}

如果用户拒绝了该位置，则给他选择更改设置的位置权限的方法：

func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {
    print("error::: \(error)")
    locationManager.stopUpdatingLocation()
    let alert = UIAlertController(title: "Settings", message: "Allow location from settings", preferredStyle: UIAlertControllerStyle.Alert)
    self.presentViewController(alert, animated: true, completion: nil)
    alert.addAction(UIAlertAction(title: TextMessages().callAlertTitle, style: .Default, handler: { action in
        switch action.style{
        case .Default: UIApplication.sharedApplication().openURL(NSURL(string: UIApplicationOpenSettingsURLString)!)
        case .Cancel: print("cancel")
        case .Destructive: print("destructive")
        }
    }))
}

注意：

确保将隐私密钥（NSLocationAlwaysAndWhenInUseUsageDescription）添加到Info.plist文件中。