ios - 标记当前位置不断给出坐标 0,0

Question

我正在为我使用 Xcode 9.2 和 Swift 4 制作的应用程序使用 Google map 服务。当我按下一个按钮时，我希望我的当前位置被标记在 map View 上，并在其上方有一个标记。相反，当点击按钮时，它会将我带到坐标 0,0。我究竟做错了什么？感谢您提前提供的所有帮助。

//Location Manager

var userLocation = CLLocation()

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

userLocation = locations.last!

let camera = GMSCameraPosition.camera(withLatitude: userLocation.coordinate.latitude, longitude: userLocation.coordinate.longitude, zoom: 14);
self.googleMapsView.camera = camera

//Finally stop updating location otherwise it will come again and again in this delegate

self.locationManager.stopUpdatingLocation()

}

//Button Marker Function

@IBAction func markCurrentLocation(_ sender: UIButton) {

let center = CLLocationCoordinate2D(latitude: userLocation.coordinate.latitude, longitude: userLocation.coordinate.longitude)

    let camera = GMSCameraPosition.camera(withLatitude: userLocation.coordinate.latitude, longitude: userLocation.coordinate.longitude, zoom: 14);
    self.googleMapsView.camera = camera
    self.googleMapsView.isMyLocationEnabled = true

    let marker = GMSMarker(position: center)

    print("Latitude :- \(userLocation.coordinate.latitude)")
    print("Longitude :-\(userLocation.coordinate.longitude)")

    marker.map = self.googleMapsView

    marker.title = "Current Location"

    googleMapsView.animate(to: camera)

    //Finally stop updating location otherwise it will come again and again in this delegate

    self.locationManager.stopUpdatingLocation()
}

Answer 1

它将返回 0，因为您创建了一个新的 CLLocation() 实例，其中没有任何内容。从 locationManager(_:didUpdateLocations:) 获取当前位置代表。

这样做:

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    userLocation = locations.last
}

并从你的 markCurrentLocation(_:) 方法中移除 let userLocation = CLLocation()

还要确保在您的 info.plist 中添加请求