Google maps in iOS doesn't show multiple pins - ios

Question

I am using Google Maps SDK in iOS app.I am stuck at plotting multiple pins on map.This is how I am trying to plot the pins.And I used the exact same approach to show multiple pins using MapKit which worked fine.But no success with google Maps.
-(void)plotMembersOnMap
{
for (NSMutableDictionary *obj in self.jsonDictionary)
{
membersDict = [obj objectForKey:#"members"];
NSLog(#"Count member %d",[membersDict count]); // shows count
for (NSDictionary *obj in membersDict)
{
CLLocationCoordinate2D center;
NSString *latitudeString = [obj objectForKey:#"lat"];
NSString *longitudeString = [obj objectForKey:#"lng"];
double latitude = [latitudeString doubleValue];
double longitude = [longitudeString doubleValue];
center.latitude =latitude;
center.longitude = longitude;
NSString *userName = [obj objectForKey:#"pseudo"];
GMSMarker *marker = [[GMSMarker alloc] init];
marker.map = mapView_;
marker.position = CLLocationCoordinate2DMake(center.latitude, center.longitude);
customGoogleCallout.callOutTitleLabel.text = #"Member";
customGoogleCallout.callOutUserName.text = userName;
marker.icon = [UIImage imageNamed:#"marker_membre.png"];
}
}
}

Answer 1

just try to add lat and lon to an array then supply the marker.position.
have some loop for i and position is object at index[i].

Answer 2

this might help...
CLLocationCoordinate2D center = { [[obj objectForKey:#"lat"] floatValue] , [[obj objectForKey:#"lon"] floatValue] };
GMSMarker *marker = [GMSMarker markerWithPosition:center];

Answer 3

Try this ,
NSArray *latitudeString = [obj objectForKey:#"lat"];
NSArray *longitudeString = [obj objectForKey:#"lng"];
Instead of
NSString *latitudeString = [obj objectForKey:#"lat"];
NSString *longitudeString = [obj objectForKey:#"lng"];

Answer 4

Maybe because it's plotting the latest coordinate you assign to center. You should make new instance so the previous value will not replaced.