从Firebase加载位置到MapView的Swift 5错误

问题描述

我正在尝试在一个应用中实现一个功能，在该应用中，管理应用共享其位置，即将地理位置保存到Firebase，最终用户应用从存储的数据库中读取该位置并能够导航到该位置。

我遇到的问题是管理应用程序保存了位置并没有回读任何问题，但是最终用户不断抛出错误，指出在展开Optional值时意外发现nil。我不知道我在想什么

此摘要将地图加载到内容视图中

++++++++++++++++++++++++++++++ （我导入了所有必需的库）

@Observedobject var obs =观察者（）

var body: some View {

  NavigationView {
  
        ZStack(alignment: Alignment.topLeading) {
            
          
            
            mapView(name: self.name,geopoints:self.obs.data["data"] as! [String: GeoPoint] ).edgesIgnoringSafeArea(.top)

然后我还有另一个文件用于地图视图

导入SwiftUI 导入CoreLocation 导入MapKit 导入Firebase

struct mapView：UIViewRepresentable {

var name = ""
var geopoints : [String : GeoPoint]

// var ShareLoc：Bool

func makeCoordinator() -> mapView.Coordinator {
    
    return mapView.Coordinator(parent1: self)
}


let map = MKMapView()
let manager = CLLocationManager()

func makeUIView(context: UIViewRepresentableContext<mapView>) -> MKMapView {
    
    self.manager.requestAlwaysAuthorization()
    
    self.manager.requestWhenInUseAuthorization()
    
    if CLLocationManager.locationServicesEnabled() {
        manager.delegate = context.coordinator
        manager.desiredAccuracy = kCLLocationAccuracyBest
        manager.startUpdatingLocation()
    }
    
    map.mapType = .standard
    map.isZoomEnabled = true
    map.isScrollEnabled = true
    
    if let coor = map.userLocation.location?.coordinate {
        map.setCenter(coor,animated: true)
    }
    
    return map
}

func updateUIView(_ uiView: MKMapView,context: UIViewRepresentableContext<mapView>) {
    
    
    for i in  geopoints{
        
        if i.key != name{
            
            let point = MKPointAnnotation()
            point.coordinate = CLLocationCoordinate2D(latitude: i.value.latitude,longitude: i.value.longitude)
            point.title = i.key
            uiView.removeAnnotations(uiView.annotations)
            uiView.addAnnotation(point)
       }

    }
    
}

class Coordinator : NSObject,CLLocationManagerDelegate{
    
    var parent : mapView
    
    init(parent1 : mapView) {
        
        parent = parent1
    }
    
   


    
    func locationManager(_ manager: CLLocationManager,didChangeAuthorization status: CLAuthorizationStatus) {
     
        if status == .denied{
            
            print("denied")
        }
        if status == .authorizedWhenInUse{
            
            print("authorized")
        }
        
        
    }
    
    func locationManager(_ manager: CLLocationManager,didUpdateLocations locations: [CLLocation]) {
        
        let locVal:CLLocationCoordinate2D = manager.location!.coordinate
        
        parent.map.mapType = MKMapType.standard
        
        let span = MKCoordinateSpan(latitudeDelta: 0.05,longitudeDelta: 0.05)
        let region = MKCoordinateRegion(center: locVal,span: span)
        parent.map.setRegion(region,animated: true)
        
        let annotation = MKPointAnnotation()
        annotation.coordinate = locVal
        annotation.title = "somewhere"
        annotation.subtitle = "Current location"
        parent.map.addAnnotation(annotation)
        
        
        let last = locations.last
        
       
        
        
        let db = Firestore.firestore()
        
        db.collection("locations").document("sharing").setData(["updates" : [self.parent.name : GeoPoint(latitude: (last?.coordinate.latitude)!,longitude: (last?.coordinate.longitude)!)]],merge: true) { (err) in
            
            
            if err != nil{
                
                print((err?.localizedDescription)!)
                return
            }
            print("success")
        }
        
    }
}

}

类观察者：ObservableObject {

@Published var data = String：任何

init() {

    let db = Firestore.firestore()

    db.collection("locations").document("sharing").addSnapshotListener { (snap,err) in

        if err != nil{
            print((err?.localizedDescription)!)
            return
        }

        let updates = snap?.get("updates") as? [String : GeoPoint]


        self.data["data"] = updates
    }
}

}

解决方法

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