Display an info window for a marker

This example displays markers on three major cities in Australia. When the user taps a marker, an info window appears.

Get started

Before you can try the sample code, you must configure your development environment. For more information, see Maps SDK for iOS code samples.

View the code

Swift

import GoogleMaps
import UIKit

final class MarkerInfoWindowViewController: UIViewController {

  private let sydneyMarker = GMSMarker(
    position: CLLocationCoordinate2D(latitude: -33.8683, longitude: 151.2086))

  private let melbourneMarker = GMSMarker(
    position: CLLocationCoordinate2D(latitude: -37.81969, longitude: 144.966085))

  private let brisbaneMarker = GMSMarker(
    position: CLLocationCoordinate2D(latitude: -27.4710107, longitude: 153.0234489))

  private lazy var contentView: UIImageView = {
    return UIImageView(image: UIImage(named: "aeroplane"))
  }()

  override func loadView() {
    let cameraPosition = GMSCameraPosition(latitude: -37.81969, longitude: 144.966085, zoom: 4)
    let mapView = GMSMapView(frame: .zero, camera: cameraPosition)
    mapView.delegate = self
    view = mapView

    sydneyMarker.title = "Sydney"
    sydneyMarker.snippet = "Population: 4,605,992"
    sydneyMarker.map = mapView

    melbourneMarker.title = "Melbourne"
    melbourneMarker.snippet = "Population: 4,169,103"
    melbourneMarker.map = mapView

    brisbaneMarker.title = "Brisbane"
    brisbaneMarker.snippet = "Population: 2,189,878"
    brisbaneMarker.map = mapView
  }
}

extension MarkerInfoWindowViewController: GMSMapViewDelegate {
  func mapView(_ mapView: GMSMapView, markerInfoWindow marker: GMSMarker) -> UIView? {
    if marker == sydneyMarker {
      return contentView
    }
    return nil
  }

  func mapView(_ mapView: GMSMapView, markerInfoContents marker: GMSMarker) -> UIView? {
    if marker == brisbaneMarker {
      return contentView
    }
    return nil
  }

  func mapView(_ mapView: GMSMapView, didCloseInfoWindowOf marker: GMSMarker) {
    showToast(message: "Info window for marker \(marker.title ?? "") closed.")
  }

  func mapView(_ mapView: GMSMapView, didLongPressInfoWindowOf marker: GMSMarker) {
    showToast(message: "Info window for marker \(marker.title ?? "") long pressed.")
  }
}

extension UIViewController {
  func showToast(message: String) {
    let toast = UIAlertController(title: nil, message: message, preferredStyle: .alert)
    present(
      toast, animated: true,
      completion: {
        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + .seconds(2)) {
          toast.dismiss(animated: true)
        }
      })
  }
}
MarkerInfoWindowViewController.swift
      

Objective-C

#import "GoogleMapsDemos/Samples/MarkerInfoWindowViewController.h"

#import "GoogleMapsDemos/UIViewController+GMSToastMessages.h"
#import <GoogleMaps/GoogleMaps.h>

@interface MarkerInfoWindowViewController () <GMSMapViewDelegate>

@end

@implementation MarkerInfoWindowViewController {
  GMSMarker *_sydneyMarker;
  GMSMarker *_melbourneMarker;
  GMSMarker *_brisbaneMarker;
  UIView *_contentView;
}

- (void)viewDidLoad {
  [super viewDidLoad];
  GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:-37.81969
                                                          longitude:144.966085
                                                               zoom:4];
  GMSMapView *mapView = [GMSMapView mapWithFrame:CGRectZero camera:camera];

  _sydneyMarker = [[GMSMarker alloc] init];
  _sydneyMarker.title = @"Sydney";
  _sydneyMarker.snippet = @"Population: 4,605,992";
  _sydneyMarker.position = CLLocationCoordinate2DMake(-33.8683, 151.2086);
  _sydneyMarker.map = mapView;
  NSLog(@"sydneyMarker: %@", _sydneyMarker);

  _melbourneMarker.map = nil;
  _melbourneMarker = [[GMSMarker alloc] init];
  _melbourneMarker.title = @"Melbourne";
  _melbourneMarker.snippet = @"Population: 4,169,103";
  _melbourneMarker.position = CLLocationCoordinate2DMake(-37.81969, 144.966085);
  _melbourneMarker.map = mapView;
  NSLog(@"melbourneMarker: %@", _melbourneMarker);

  _brisbaneMarker.map = nil;
  _brisbaneMarker = [[GMSMarker alloc] init];
  _brisbaneMarker.title = @"Brisbane";
  _brisbaneMarker.snippet = @"Population: 2,189,878";
  _brisbaneMarker.position = CLLocationCoordinate2DMake(-27.4710107, 153.0234489);
  _brisbaneMarker.map = mapView;
  NSLog(@"brisbaneMarker: %@", _brisbaneMarker);

  _contentView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"aeroplane"]];

  mapView.delegate = self;
  self.view = mapView;
}

#pragma mark GMSMapViewDelegate

- (UIView *)mapView:(GMSMapView *)mapView markerInfoWindow:(GMSMarker *)marker {
  if (marker == _sydneyMarker) {
    return _contentView;
  }
  return nil;
}

- (UIView *)mapView:(GMSMapView *)mapView markerInfoContents:(GMSMarker *)marker {
  if (marker == _brisbaneMarker) {
    return _contentView;
  }
  return nil;
}

- (void)mapView:(GMSMapView *)mapView didCloseInfoWindowOfMarker:(GMSMarker *)marker {
  NSString *message =
      [NSString stringWithFormat:@"Info window for marker %@ closed.", marker.title];
  [self gms_showToastWithMessage:message];
}

- (void)mapView:(GMSMapView *)mapView didLongPressInfoWindowOfMarker:(GMSMarker *)marker {
  NSString *message =
      [NSString stringWithFormat:@"Info window for marker %@ long pressed.", marker.title];
  [self gms_showToastWithMessage:message];
}

@end
MarkerInfoWindowViewController.m
      

Run the full sample app locally

The Maps SDK for iOS sample app is available as a download archive from GitHub. Follow these steps to install and try the Maps SDK for iOS sample app.

1. Run git clone https://github.com/googlemaps-samples/maps-sdk-for-ios-samples.git to clone the samples repository into a local directory.

2. Open a terminal window, navigate to the directory where you cloned the sample files, and drill down into the GoogleMaps directory:

   Swift

   cd maps-sdk-for-ios-samples-main/GoogleMaps-Swift
   pod install
   open GoogleMapsSwiftDemos.xcworkspace

   Objective-C

   cd maps-sdk-for-ios-samples-main/GoogleMaps
   pod install
   open GoogleMapsDemos.xcworkspace

3. In Xcode, press the compile button to build the app with the current scheme. The build produces an error, prompting you to enter your API key in the SDKConstants.swift file for Swift orSDKDemoAPIKey.h file for Objective-C.
4. If you don't yet have an API key, follow the instructions to set up a project on the Google Cloud Console and get an API key. When configuring the key on the Cloud Console, you can restrict the key to the sample app's bundle identifier to ensure that only your app can use the key. The default bundle identifier of the SDK samples app is com.example.GoogleMapsDemos.
5. Edit the SDKConstants.swift file for Swift orSDKDemoAPIKey.h file for Objective-C and paste your API key into the definition of either the apiKey or kAPIKey constant. For example:

   Swift

   static let apiKey = "YOUR_API_KEY"

   Objective-C

   static NSString *const kAPIKey = @"YOUR_API_KEY";

6. In the SDKConstants.swift file (Swift) orSDKDemoAPIKey.h file (Objective-C), remove the following line, because it's used to register the user-defined issue:

   Swift

   #error (Register for API Key and insert here. Then delete this line.)

   Objective-C

   #error Register for API Key and insert here.

7. Build and run the project. The iOS simulator window appears, showing a list of Maps SDK Demos.
8. Choose one of the options displayed, to experiment with a feature of the Maps SDK for iOS.
9. If prompted to allow GoogleMapsDemos to access your location, choose Allow.