使用corelocationframework获取用户的位置无法使用wifi

Question

我试图通过使用核心位置框架来获取用户的位置。无论如何，它只是在连接互联网时提供位置和地址。我想通过GPS获取用户的位置。

 - (void)viewDidLoad 
{
   [super viewDidLoad];

   self.locationManager = [[CLLocationManager alloc]init];
   geocoder = [[CLGeocoder alloc]init];
   self.locationManager.delegate=self;
   self.locationManager.desiredAccuracy=kCLLocationAccuracyBest;
   if([[[UIDevice currentDevice]systemVersion]floatValue]>=8.0)
   {
     [self.locationManager requestAlwaysAuthorization];
   }
    [self.locationManager startUpdatingLocation];
// Do any additional setup after loading the view, typically from a nib.
 }
 -(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError 
 *)error
 {
  NSLog(@"did fail with error %@",error);
 }

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation: 
(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{

  CLLocation *currentLocation=newLocation;
  NSLog(@"location : %@",currentLocation);

 if(currentLocation !=nil)
 {
    self.latitudelabel.text = [NSString 
    stringWithFormat:@"%.8f",currentLocation.coordinate.latitude];
    self.longitudelabel.text = [NSString  
    stringWithFormat:@"%.8f",currentLocation.coordinate.longitude];
 }

 CLLocationDistance distance = [newLocation distanceFromLocation:oldLocation];

 NSLog(@"Calc.distance%f",distance);


[geocoder reverseGeocodeLocation:currentLocation completionHandler:^
 (NSArray   *placemarks, NSError *error)
 {

     if(error == nil && [placemarks count]>0)
     {
         placemark = [placemarks lastObject];
         NSLog(@"Country %@",placemark.country);
         NSLog(@"Area %@",placemark.administrativeArea);
         NSLog(@"City %@",placemark.locality);
         NSLog(@"Code %@",placemark.postalCode);
         NSLog(@"Road %@",placemark.thoroughfare);
         NSLog(@"Number %@",placemark.subThoroughfare);

         self.addresslabel.text = [NSString stringWithFormat:@"%@ %@ 
    \n %@ %@    \n %@ \n %@",
     placemark.subThoroughfare,    placemark.thoroughfare,
                              placemark.postalCode, placemark.locality,
                              placemark.administrativeArea,
                              placemark.country];

         [self.locationManager stopUpdatingLocation];
     }
     else
     {
         NSLog(@"tktk%@",error.debugDescription);
         [self.locationManager stopUpdatingLocation];
     }
 }];

}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}

- (IBAction)btnPressed:(UIButton *)sender
{
  locationManager.delegate=self;
  locationManager.desiredAccuracy=kCLLocationAccuracyBest;
  if([[[UIDevice currentDevice]systemVersion]floatValue]>=8.0)
  {
    [self.locationManager requestAlwaysAuthorization];
  }
  [locationManager startUpdatingLocation];
  }
@end

有什么建议吗？