इस उदाहरण में, GMSFeatureTypeLocality के लिए मैप की सीमाएं दिखाई गई हैं. साथ ही, delegate फ़ंक्शन लागू किया गया है, जो क्लिक किए गए पॉलीगॉन को स्टाइल करता है. नतीजे के तौर पर, इवेंट डेटा के साथ सूचना वाली एक विंडो दिखती है.
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];
}