ios - 在当前位置和单独位置 mkmapview 上放置地标

Question

我在使用 MKMapView 时遇到了一些问题!我是映射的新手!我正在尝试做什么:

Mapview 加载并在用户当前位置和所选客户的地址上放置一个地标。此代码可以在所选客户的地址上放置一个地标，但我似乎无法让它在用户的当前位置放置一个!

有什么想法吗？

    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
[geocoder geocodeAddressString:postcodeForMap
             completionHandler:^(NSArray* placemarks, NSError* error){
                     NSLog(@"Co-ordinate geocode is %@", [placemarks objectAtIndex:0]);
                 for (CLPlacemark* aPlacemark in placemarks)

                 {
                     CLPlacemark *topResult = [placemarks objectAtIndex:0];
                     MKPlacemark *placemark = [[MKPlacemark alloc] initWithPlacemark:topResult];
                     MKPlacemark *mPlacemark = [[MKPlacemark alloc] initWithCoordinate:mapView.userLocation.location.coordinate addressDictionary:nil];



                     MKCoordinateRegion region = mapView.region;
                     region.center = placemark.region.center;
                     region.span.longitudeDelta /= 8.0;
                     region.span.latitudeDelta /= 8.0;

                     [mapView setRegion:region animated:YES];
                     [mapView addAnnotation:placemark];
                     [mapView addAnnotation:mPlacemark];

                 }
             }
 ];

Answer 1

您可以使用以下代码获取用户位置

-(void)viewDidLoad{
    CLLocationManager *locationManager=[[CLLocationManager alloc] init];
    locationManager.delegate=self;//THIS IS IMPORTANT
    [locationManager startUpdatingLocation];
}

当您告诉位置管理器获取位置时，如果 Allowed locationmanager 调用其委托(delegate)方法，请参见下文

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
          //newLocation is your current Location

   self.userLocation=newLocation;//Once you got the location generate the places..
   [self generatePlaces];
   [manager stopUpdatingLocation];

}

-(void)generatePlaces{
  CLGeocoder *geocoder = [[CLGeocoder alloc] init];
[geocoder geocodeAddressString:postcodeForMap
             completionHandler:^(NSArray* placemarks, NSError* error){
                     NSLog(@"Co-ordinate geocode is %@", [placemarks objectAtIndex:0]);
                 for (CLPlacemark* aPlacemark in placemarks)

                 {
                     CLPlacemark *topResult = [placemarks objectAtIndex:0];
                     MKPlacemark *placemark = [[MKPlacemark alloc] initWithPlacemark:topResult];
                     //EDITED
                     MKPlacemark *mPlacemark = [[MKPlacemark alloc] initWithCoordinate:self.userLocation.coordinate addressDictionary:nil];



                     MKCoordinateRegion region = mapView.region;
                     region.center = placemark.region.center;
                     region.span.longitudeDelta /= 8.0;
                     region.span.latitudeDelta /= 8.0;

                     [mapView setRegion:region animated:YES];
                     [mapView addAnnotation:placemark];
                     [mapView addAnnotation:mPlacemark];

                 }
             }
 ];
}