Ví dụ này cho thấy các ranh giới bản đồ cho GMSFeatureTypeLocality
và triển khai hàm delegate để tạo kiểu cho đa giác đã nhấp. Kết quả sẽ hiển thị một cửa sổ cảnh báo thông tin có dữ liệu sự kiện.
Swift
class SampleViewController: UIViewController { private lazy var mapView: GMSMapView = GMSMapView(frame: .zero, mapID: GMSMapID(identifier: "YOUR_MAP_ID"), camera: GMSCameraPosition(latitude: 40, longitude: -80, zoom: 12)) override func loadView() { view = mapView let style = FeatureStyle(fill: .orange.withAlphaComponent(0.5), stroke: .orange, strokeWidth: 2) mapView.featureLayer(of: .locality).style = { _ in style } mapView.delegate = self } } extension SampleViewController: GMSMapViewDelegate { func mapView(_ mapView: GMSMapView, didTap features: [Feature], in featureLayer: FeatureLayer<Feature>, atLocation: CLLocationCoordinate2D) { let toast = UIAlertController(title: "Clicked places", message: (features.compactMap { ($0 as? PlaceFeature)?.placeID }).joined(separator: ", "), preferredStyle: .alert) present(toast, animated: true, completion: nil) } }
Objective-C
@interface SampleViewController: UIViewController <GMSMapViewDelegate> @end @implementation SampleViewController - (void)loadView { GMSMapView *mapView = [GMSMapView mapWithFrame:CGRectZero mapID:[GMSMapID mapIDWithIdentifier:@"YOUR_MAP_ID"] camera:[GMSCameraPosition cameraWithLatitude:40 longitude:-80 zoom:12]]; mapView.delegete = self; GMSFeatureStyle *style = [GMSFeatureStyle styleWithFillColor:[[UIColor orangeColor] colorWithAlphaComponent:0.5] strokeColor:[UIColor orangeColor] strokeWidth:2.0]; [mapView featureLayerOfFeatureType:GMSFeatureTypeLocality].style = ^(GMSPlaceFeature *feature) { return style; }; self.view = mapView; } - (void)mapView:(GMSMapView *)mapView didTapFeatures:(NSArray<id<GMSFeature>> *)features inFeatureLayer:(GMSFeatureLayer *)featureLayer atLocation:(CLLocationCoordinate2D)location { NSMutableArray<NSString *> *places = [NSMutableArray array]; for (id<GMSFeature> feature in features) { if (![feature isKindOfClass:[GMSPlaceFeature class]]) { continue; } NSString *placeID = ((GMSPlaceFeature *)feature).placeID; [places addObject:placeID]; } UIAlertController *toast = [UIAlertController alertControllerWithTitle:@"Clicked places" message:[places componentsJoinedByString:@", "] preferredStyle:UIAlertControllerStyleAlert]; [self presentViewController:toast animated:YES completion:nil]; }