当被问到位置时，核心位置返回nil

Question

我的Custom类中的私有常量：

private let locationManager = CLLocationManager()

在viewDidLoad()中的

我称之为方法：

private func setupLocationManager() {
    locationManager.delegate = self
    locationManager.distanceFilter = kCLDistanceFilterNone
    locationManager.desiredAccuracy = kCLLocationAccuracyBest
    locationManager.startUpdatingLocation()
}

但是当我稍后询问位置时：

println("-----\(locationManager.location)")

我明白了：

-----nil

问题出在哪里？我在设备上运行它。我的应用程序可以使用位置...

Answer 1

您不应该尝试以这种方式获取位置，因为获取位置可能需要一些时间（有关详细信息，请参阅GPS TTFF）。由于您的位置管理员已经拥有委托，您必须在didUpdateLocations委托方法中获取位置。在致电startUpdatingLocation

之前，请务必确保您拥有使用位置的权限

private func setupLocationManager() {
    locationManager.delegate = self
    locationManager.distanceFilter = kCLDistanceFilterNone
    locationManager.desiredAccuracy = kCLLocationAccuracyBest

    if CLLocationManager.authorizationStatus() == CLAuthorizationStatus.AuthorizedWhenInUse || CLLocationManager.authorizationStatus() == CLAuthorizationStatus.AuthorizedAlways{

        locationManager.startUpdatingLocation()

    }else{
        locationManager.requestWhenInUseAuthorization()
    }
}

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

    println(manager.location)

}

func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {

    if status == CLAuthorizationStatus.AuthorizedWhenInUse || status == CLAuthorizationStatus.AuthorizedAlways {

        locationManager.startUpdatingLocation()

    }
}