ioS Google map v2 not working - my location cannot be got - ios

Question

I am working on iOS app using Google Map SDK. I try to set on the CLLocationManager to get location of my device for 10 seconds and right bottom button to get my location instantly. When it comes to the implementation, the app show no response to initiate the method startUpdatingLocation to get my location. Would you please tell me the way to use locationManager to finish the aim?
The following is my working :
-(bool)isNetworkAvailable
{
SCNetworkReachabilityFlags flags;
SCNetworkReachabilityRef address;
address = SCNetworkReachabilityCreateWithName(NULL, "www.apple.com" );
Boolean success = SCNetworkReachabilityGetFlags(address, &flags);
CFRelease(address);
bool canReach = success
&& !(flags & kSCNetworkReachabilityFlagsConnectionRequired)
&& (flags & kSCNetworkReachabilityFlagsReachable);
return canReach;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// [self getTime];
if (![CLLocationManager locationServicesEnabled]) {
NSLog(#"Please enable location services");
return;
}
if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusDenied) {
NSLog(#"Please authorize location services");
return;
}
if([self isNetworkAvailable]){
NSLog(#"connected ");
}else {
NSLog(#"not connected ");
}
CarArray = [[NSMutableArray alloc] init];
GMSMarker *marker = [[GMSMarker alloc] init];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
float latitide = [defaults floatForKey:#"lati"];
float longitude = [defaults floatForKey:#"longi"];
NSString *desp = [defaults objectForKey:#"desp"];
NSLog(#"assadsd arrived map");
if(latitide!=0.00&&longitude!=0.00) {
CLLocationCoordinate2D position = CLLocationCoordinate2DMake(latitide, longitude);
marker.position = CLLocationCoordinate2DMake(position.latitude, position.longitude);
camera = [GMSCameraPosition cameraWithLatitude:latitide longitude:longitude zoom:12];
}else{
camera = [GMSCameraPosition cameraWithLatitude:22.2855200 longitude:114.1576900 zoom:12];
marker.position = CLLocationCoordinate2DMake(22.2855200, 114.1576900);
}
if(desp.length > 0 ){
marker.title = desp;
}
self.locationManager = [[CLLocationManager alloc]init];
self.locationManager.delegate = self;
[self.locationManager requestWhenInUseAuthorization];
[self.locationManager requestAlwaysAuthorization];
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest ;
self.locationManager.distanceFilter = 5.0f;
mapView_ = [GMSMapView mapWithFrame:CGRectZero camera:camera];
marker.snippet = #"HK";
marker.map = mapView_;
mapView_.mapType = kGMSTypeSatellite;
mapView_.delegate = self;
dispatch_async(dispatch_get_main_queue(), ^{
mapView_.myLocationEnabled = YES;
});
mapView_.settings.compassButton = YES;
mapView_.settings.myLocationButton = YES;
[mapView_ addObserver:self
forKeyPath:#"myLocation"
options:NSKeyValueObservingOptionNew
context:NULL];
self.view = mapView_;
[self.locationManager startUpdatingLocation];
NSLog(#"assadsd configured d map");
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusDenied) {
NSLog(#"Please authorize location services");
return;
}
NSLog(#"CLLocationManager error: %#", error.localizedFailureReason);
NSLog(#"didFailWithError: %#", error);
UIAlertView *errorAlert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(#"application_name", nil) message:NSLocalizedString(#"location_error", nil) delegate:nil cancelButtonTitle:NSLocalizedString(#"ok", nil) otherButtonTitles:nil];
[errorAlert show];
return;
}
-(void) handleDoubleTap {
NSLog(#"location double tap ");
}
-(UIStatusBarStyle)preferredStatusBarStyle
{
return UIStatusBarStyleLightContent;
}
// CLLocationDelegate
- (void)locationManager:(CLLocationManager *)manager
didUpdateLocations:(NSArray *)locations{
// Optional: check error for desired accuracy
CLLocation* location = [locations lastObject];
NSLog(#"location x : %f" , location.coordinate.longitude);
NSLog(#"location y : %f" , location.coordinate.latitude);
NSDate* eventDate = location.timestamp;
NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];
[manager allowDeferredLocationUpdatesUntilTraveled:CLLocationDistanceMax timeout:10];
if (markera == nil) {
markera = [[GMSMarker alloc] init] ;
markera.position = CLLocationCoordinate2DMake( location.coordinate.latitude , location.coordinate.longitude );
markera.groundAnchor = CGPointMake(0.5f, 0.97f); // Taking into account walker's shadow
markera.map = mapView_;
}else {
markera.position = location.coordinate;
}
GMSCameraUpdate *move = [GMSCameraUpdate setTarget:location.coordinate zoom:17];
[mapView_ animateWithCameraUpdate:move];
}