如何使用swift从firebase实时数据库中提取位置标记并添加到Xcode中的地图视图

pod 'Firebase/Database'

import Firebase

FirebaseApp.configure()

let databaseRef = Database.database().reference()

databaseRef.child("位置标记").observe(.value) { (snapshot) in
    // 处理数据快照
    if let locations = snapshot.value as? [String: Any] {
        for (locationId, locationData) in locations {
            if let location = locationData as? [String: Any] {
                // 提取位置标记的信息
                let latitude = location["纬度"] as? Double
                let longitude = location["经度"] as? Double
                
                // 在地图视图中添加标记
                let annotation = MKPointAnnotation()
                annotation.coordinate = CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
                mapView.addAnnotation(annotation)
            }
        }
    }
}