Événements du calque d'éléments géographiques

Sélectionnez une plate-forme : Android iOS JavaScript

Cet exemple montre les limites de la carte pour GMSFeatureTypeLocality et implémente la fonction delegate qui stylise le polygone cliqué. Le résultat affiche une fenêtre d'alerte d'informations avec les données de l'événement.

Schéma illustrant une carte de polygone de limite sur laquelle on a cliqué

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];
}