My GMSMarker shows on top left , I want to show it on center objective-c

Question

I want to show my marker on the center of the map but it shows on the top left.

Below is my code implementation:

- (void)viewDidLoad {
    [super viewDidLoad];
NSDictionary *userLoc=[kNSUserDefaults objectForKey:@"userLocation"];
mapView_.delegate = self;
CGFloat lat = [[userLoc objectForKey:@"lat"] floatValue];
CGFloat lon = [[userLoc objectForKey:@"long"] floatValue];
   
GMSMarker *marker = [[GMSMarker alloc] init];
    
marker.position = CLLocationCoordinate2DMake(lat, lon);
mapView_.myLocationEnabled = YES;
mapView_.settings.myLocationButton = YES;
mapView_.mapType = kGMSTypeHybrid;
marker.map = mapView_;
GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:lat longitude:lon zoom:17];
[mapView_ animateToCameraPosition:camera];
[mapView_ setAutoresizingMask:UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight];
mapView_.settings.compassButton = YES;
mapView_.mapType = kGMSTypeHybrid;
mapView_.settings.myLocationButton = YES;
mapView_.delegate = self;
mapView_.trafficEnabled = YES;
}

Not able to understand what's wrong in my code.

Thanks in advance!