Question

在我的代码中，首先我显示了所需位置的当前位置和静态位置，例如。莫比乌斯适合。但是当我在搜索相同的时候。莫比乌斯适合它显示两个彼此靠近莫比斯适合位置的针脚，而不是一个。如何在搜索中只显示一个引脚？我的代码：

 class LocationMapViewController:  UIViewController,CLLocationManagerDelegate, MKMapViewDelegate,UISearchBarDelegate,UIGestureRecognizerDelegate{

            var searchController:UISearchController!
            var annotation:MKAnnotation!
            var localSearchRequest:MKLocalSearchRequest!
            var localSearch:MKLocalSearch!
            var localSearchResponse:MKLocalSearchResponse!
            var error:NSError!
            var pointAnnotation:MKPointAnnotation!
            var pinAnnotationView:MKAnnotationView!
            let manager = CLLocationManager()
            @IBOutlet var MKView: MKMapView!
            @IBOutlet var searchBarButton: UISearchBar!


    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
                let location = locations[0]
                let span:MKCoordinateSpan = MKCoordinateSpanMake(0.01, 0.01)
                let myLocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)
                let region:MKCoordinateRegion = MKCoordinateRegionMake(myLocation, span)
                MKView.setRegion(region, animated: true)
                self.MKView.showsUserLocation = true
            }



//Here im displaying two static location and current location


            let regionRadius: CLLocationDistance = 10000

            override func viewDidLoad() {
                self.searchBarButton.delegate = self
                super.viewDidLoad()
                manager.delegate = self
                manager.desiredAccuracy = kCLLocationAccuracyBest
                manager.requestWhenInUseAuthorization()
                manager.startUpdatingLocation()

                manager.stopMonitoringSignificantLocationChanges()
                let initialLocation = CLLocation(latitude: 37.539624, longitude: -122.062990)

                self.MKView.showsUserLocation = true
                self.MKView.isZoomEnabled = true
                centerMapOnLocation(location: initialLocation)
                let myAnnotation: MKPointAnnotation = MKPointAnnotation()
                myAnnotation.coordinate = CLLocationCoordinate2DMake(initialLocation.coordinate.latitude, initialLocation.coordinate.longitude);
                myAnnotation.title = "Fit@PRC"
                myAnnotation.subtitle = "Newark, CA 94560"
                MKView.addAnnotation(myAnnotation)
                MKView.selectAnnotation(myAnnotation, animated: true)

    let MobiusLocation = CLLocation(latitude: 37.454904, longitude: -122.228262)

                self.MKView.showsUserLocation = true
                self.MKView.isZoomEnabled = true
                centerMapOnLocation(location: MobiusLocation)
                let mobiusAnnotation: MKPointAnnotation = MKPointAnnotation()
                mobiusAnnotation.coordinate = CLLocationCoordinate2DMake(MobiusLocation.coordinate.latitude, MobiusLocation.coordinate.longitude);
                mobiusAnnotation.title = "Mobius Fit"
                mobiusAnnotation.subtitle = "Redwood City,CA 94061"
                MKView.addAnnotation(mobiusAnnotation)
                MKView.selectAnnotation(mobiusAnnotation, animated: true)


            }

// this is my search function . how to clear previous pins on search ?

    func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {

                searchBar.endEditing(true)
                //1
                searchBar.resignFirstResponder()

                if self.MKView.annotations.count != 0{
                    annotation = self.MKView.annotations[0]
                    self.MKView.removeAnnotation(annotation)
                }
                //2
                localSearchRequest = MKLocalSearchRequest()
                localSearchRequest.naturalLanguageQuery = searchBar.text
                localSearch = MKLocalSearch(request: localSearchRequest)
                localSearch.start { (localSearchResponse, error) -> Void in

                    if localSearchResponse == nil{
                        let alertController = UIAlertController(title: nil, message: "Place Not Found", preferredStyle: UIAlertControllerStyle.alert)
                        alertController.addAction(UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.default, handler: nil))
                        self.present(alertController, animated: true, completion: nil)


                        return
                    }
                    //3
                    self.pointAnnotation = MKPointAnnotation()
                    self.pointAnnotation.title = searchBar.text
                    self.pointAnnotation.coordinate = CLLocationCoordinate2D(latitude: localSearchResponse!.boundingRegion.center.latitude, longitude:     localSearchResponse!.boundingRegion.center.longitude)


                    self.pinAnnotationView = MKPinAnnotationView(annotation: self.pointAnnotation, reuseIdentifier: nil)
                    self.MKView.centerCoordinate = self.pointAnnotation.coordinate

                    self.MKView.addAnnotation(self.pinAnnotationView.annotation!)

                    self.manager.stopUpdatingLocation()
                    self.manager.stopMonitoringSignificantLocationChanges()


                }
            }

Answer 1

已更新

在添加新注释之前，您必须先删除以前添加的注释所以你可以用这两种方式实现这个目标

首先：在添加新的

之前删除您的特定注释

for  annotation in mapView.annotations
{
    if(annotation.title! == "yourTitleAnnotationToRemove"){
    mapView.removeAnnotation(annotation);
        break
    }
}

第二步：删除所有符号，然后再添加新符号

let allAnnotations = mapView.annotations
mapView.removeAnnotations(allAnnotations)

当搜索位置时它在地图上显示2个引脚而不是1个引脚。在搜索时只显示一个引脚？

1 个答案: