Question

迅速，我正在使用地图视图。当我尝试更改地图视图时，当我调用api并传递数组时，图钉未更改。但是当我在视图上添加大头针确实加载了它时，地图视图大头针图像已更改。

查看加载代码是否正常工作。

override func viewDidLoad() {
        super.viewDidLoad()
    let london = MapPin(title: "London", subtitle: "Home to the 2012 Summer Olympics.", coordinate: CLLocationCoordinate2D(latitude: 51.507222, longitude: -0.1275))

    let oslo = MapPin(title: "oslo", subtitle: "Home to the 2012 Summer Olympics.", coordinate: CLLocationCoordinate2D(latitude: 51.506222, longitude: -0.1275))


    let mylocation = MyLocation(title: "myLocation", subtitle: "", coordinate: CLLocationCoordinate2D(latitude: 51.506522, longitude: -0.1225))

    mapView.addAnnotations([london,oslo,mylocation])
      mapView.addAnnotations([london])
    mapView.showAnnotations(mapView.annotations, animated: true)
    mapView.showsUserLocation = true
    mapView.centerCoordinate = CLLocationCoordinate2D(latitude: 51.506522, longitude: -0.1225)
}

但是当我尝试在调用api之后更新mapview时，它不起作用

self.aryData = (response as! NSDictionary).value(forKey: "category") as? NSArray ?? NSArray()
               // mapView

                DispatchQueue.main.async {
                let allAnnotations = self.mapView.annotations
                self.mapView.removeAnnotations(allAnnotations)

               // var aryAnotation:[MapPin] = [MapPin]()
                let aryAnotation:NSMutableArray = NSMutableArray()

                for i in 0..<self.aryData.count {
                    let getobj:NSDictionary = self.aryData.object(at: i) as? NSDictionary ?? NSDictionary()
                    let getTitle:String = getobj.value(forKey: "offer_title") as? String ?? ""
                    let getlat:String = getobj.value(forKey: "lat") as? String ?? ""
                    let getlong:String = getobj.value(forKey: "lng") as? String ?? ""
                    let lat:Double = Double(getlat) ?? 0.0
                    let long:Double = Double(getlong) ?? 0.0

                    let theAnotation = MapPin(title: getTitle, subtitle: "", coordinate: CLLocationCoordinate2D(latitude: lat, longitude: long), tag: i)

                 //   aryAnotation.append(theAnotation)
                    //add(theAnotation)
                    aryAnotation.add(theAnotation)

                }

                let latuser:Double = Double(ApplicationManager.instance.user_lat) ?? 0.0
                let longUser:Double = Double(ApplicationManager.instance.user_long) ?? 0.0

                 let mylocation = MyLocation(title: "myLocation", subtitle: "", coordinate: CLLocationCoordinate2D(latitude: latuser, longitude: longUser))
               // aryAnotation.append(mylocation)
                aryAnotation.add(mylocation)
                self.mapView.addAnnotations(aryAnotation as! [MKAnnotation])
                self.mapView.showAnnotations(self.mapView.annotations, animated: true)

HERE是我的地图查看代码

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        let identifier = "MapPin"
        if annotation is MapPin {
            var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier)
            if annotationView == nil {

                //annotationView = MKMarkerAnnotationView(annotation: annotation, reuseIdentifier: identifier)
                annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
                annotationView?.canShowCallout = false
            } else  {
                annotationView?.annotation = annotation
            }

            annotationView?.image = #imageLiteral(resourceName: "mapSet")

            return annotationView
        }else
        {


            var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier)
            if annotationView == nil {

                annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
                annotationView?.canShowCallout = true                
            } else  {
                annotationView?.annotation = annotation
            }

            annotationView?.image = UIImage(named:"mylocation")

            return annotationView

        }
    }

请帮助我。调用api后，固定图片未更改，即使我在api调用后使用的相同代码（viewdidload）代码也未更新固定图片。我在做什么错。

mapview图钉图像未快速更改

0 个答案: