从Cloud Firestore获取经度并将其添加到Mapbox作为注释

Question

我正在尝试从所有Firestore文档中检索航班号，纬度和经度，并将它们作为Mapbox注释添加到mapView中。到目前为止，代码已从Cloud Firestore中提取数据并将其存储为变量。附加地，该代码显示带有坐标的Mapbox地图，但是必须在数组中手动​​分配

在将Firestore中的变量附加到坐标数组时遇到麻烦。

我发现这个"Add annotation after retrieving users latitude and longitude from Firebase"沿正确的路线，但是与firebase而不是firestore有关。

任何帮助将不胜感激！

class HomeViewController: UIViewController, MGLMapViewDelegate {
override func viewDidLoad() {
    super.viewDidLoad()

    let mapView = MGLMapView(frame: view.bounds)
    mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
    mapView.styleURL = MGLStyle.darkStyleURL
    mapView.tintColor = .lightGray
    mapView.centerCoordinate = CLLocationCoordinate2D(latitude: 0, longitude: 66)
    mapView.zoomLevel = 2
    mapView.delegate = self
    view.addSubview(mapView)

    var aircraftArray = [""]


    let db = Firestore.firestore()
    let AircraftRef = db.collection("LiveAircraftData").getDocuments { (snapshot, err) in
        if let err = err {
            print("Error getting documents: \(err)")
        } else {
            for document in snapshot!.documents {
                let FlightNumber = document.documentID
                let latitude = document.get("Latitude") as! Double
                let longitude = document.get("Longitude") as! Double

                print(FlightNumber, latitude, longitude)

                var Coordinates = CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
                aircraftArray.append(Coordinates)

                var pointAnnotations = [MGLPointAnnotation]()
                for coordinate in Coordinates {
                    let point = MGLPointAnnotation()
                    point.coordinate = coordinate
                    point.title = "\(coordinate.latitude), \(coordinate.longitude)"
                    pointAnnotations.append(point)
                }

                mapView.addAnnotations(pointAnnotations)


            }

        }
    }
}

This is what my database looks like

screenshot of code