title: iOS Google Maps SDK, Can't listen to GMSMarker tap event
body: <p>I'm stuck with GoogleMaps SDK for iOS...<br />
  I want to add some features when I tap on a GMSMarker on my Google Map, but it doesn't work.
  Is there something wrong?</p>
  
  <p><strong>FirstController.h</strong></p>
  
  <pre><code>#import &lt;UIKit/UIKit.h&gt;
  #import &lt;GoogleMaps/GoogleMaps.h&gt;
  #import &lt;CoreLocation/CoreLocation.h&gt;
  #import "sqlite3.h"
  
  @interface FirstViewController : UIViewController &lt;CLLocationManagerDelegate,
                                                    GMSMapViewDelegate&gt;
  {
      sqlite3 *db;
  }
  </code></pre>
  
  <p><strong>FirstController.m</strong></p>
  
  <pre><code>[...]
  
  -(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
  {
      camera = [GMSCameraPosition cameraWithLatitude:newLocation.coordinate.latitude longitude:newLocation.coordinate.longitude zoom:(12)];
      mapView_ = [GMSMapView mapWithFrame:CGRectZero camera:camera];
      mapView_.myLocationEnabled = YES;
  
      for(GMSMarker *currentMarker in _locationMarkers)
      {
          currentMarker.map = mapView_;
      }
  
      self.view = mapView_;
  }
  
  
  -(BOOL) mapView:(GMSMapView *) mapView didTapMarker:(GMSMarker *)marker
  {
      NSLog(@"try");
      return YES;
  }
  </code></pre>