ios - 在 ios 中显示位置并找到最近的位置

Question

我想显示我的点 NSArray *chSpot = [parser parseArray:responseObject];它接收 3 个对象，我想显示与其纬度和经度有关的每个位置

并根据我的位置找到最近的地点...我正在使用此代码:

         NSArray *chSpot = [parser parseArray:responseObject];

//GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:[locLat doubleValue]//经度:[locLong doubleValue]//缩放:4];

     mapView_ = [GMSMapView mapWithFrame:CGRectZero camera:nil];
     mapView_.myLocationEnabled = YES;
     mapView_.settings.myLocationButton = YES;


     for (int i=0; i<chSpot.count; i++)
     {

         ChargingSpots *spot = [chSpot objectAtIndex:i];
         NSString *locLat = spot.LocationLat;
         NSString *locLong = spot.LocationLong;


         // Creates a marker in the center of the map.
         GMSMarker *marker = [[GMSMarker alloc] init];
         marker.position = CLLocationCoordinate2DMake([locLat doubleValue], [locLong doubleValue]);
         marker.title = @"Amman";
         marker.snippet = @"Jordan";

         mapView_.delegate=self;
         marker.appearAnimation = kGMSMarkerAnimationPop;
         marker.icon = [UIImage imageNamed:@"car"];
         marker.map = mapView_;

     }

     //[mapView_ setSelectedMarker:marker];

     self.view = mapView_;

//
//
//CLLocation *locationA = [[CLLocation alloc] initWithLatitude:[locLat doubleValue] longitude:[locLong doubleValue]];//
//CLLocation *locationB = [[CLLocation alloc] initWithLatitude:[locLat doubleValue] longitude:[locLong doubleValue]];//
//CLLocationDistance distance = [ locationA distanceFromLocation:locationB];//
//NSLog (@"%f",distance);

     self.locationManager = [[CLLocationManager alloc] init];
     self.locationManager.distanceFilter = kCLDistanceFilterNone;
     self.locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;

     [self.locationManager startUpdatingLocation];

Answer 1

在您的 locationManager 的委托(delegate)方法 locationManager:didUpdateLocations: 中，您可以获得您的当前位置，它提供了计算 distanceFromLocation:(const CLLocation *)location 的方法

CLLocationDistance distA = [currentLocation distanceFromLocation: locationA];CLLocationDistance distB = [currentLocation distanceFromLocation: locationB];//等等