Using Core Location on my iPod touch - ios

Question

i have been trying to implement the following code on my device:-
#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
#interface Whereami1ViewController : UIViewController<CLLocationManagerDelegate>
{
CLLocationManager *locationManager;
__weak IBOutlet UILabel *coordLabel;
}
#end
#implementation Whereami1ViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
locationManager = [[CLLocationManager alloc] init];
[locationManager setDelegate:self];
[locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
locationManager.distanceFilter= 5.00;//5 meters
[locationManager startUpdatingLocation];
}
return self;
}
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{//location manager sends this message to self
NSLog(#"%#",NSStringFromSelector(_cmd));
NSLog(#"new location–– %#",[locations lastObject]);
NSLog(#"latitude= %f, longitude= %f",[[locations lastObject] coordinate].latitude, [[locations lastObject] coordinate].longitude);
CGSize coordData= {[[locations lastObject] coordinate].latitude, [[locations lastObject] coordinate].longitude};
coordLabel.text= NSStringFromCGSize(coordData);//setting the label's text
}
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
NSLog(#"%#",NSStringFromSelector(_cmd));
NSLog(#"location not found: %#", error);
}
#end
In the code i have set the distance filter as 5 meters. This means after 5 meters worth of movement the device goes through, it should be updating the label's text to a new coordinate,(latitude, longitude). But this is not happening in reality. I mean
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
should get called only when the device has moved more than 5 meters.In actuality, the device is stuck with the initial data (the label does not update in the view)..
What am i doing wrong.. Isn't this the right way??

Answer 1

The iPod touch uses WiFi networks for location service. So it may be impossible to get a good location or an update for 5 meter moves?! It ill behave quite different than an iPhone or iPda that also use GPS signals for location.