Question

I have a CLLocation Manager called “myLocation”

myLocation = [[CLLocationManager alloc] init];
    myLocation.desiredAccuracy = kCLLocationAccuracyBestForNavigation ;
        myLocation.delegate=self;
[myLocation startUpdatingLocation];

I need to know time interval between location updates. I am using timestamp to find when new location was found as follows in didUpdateToLocation method

- (void)locationManager:(CLLocationManager *)manager
    didUpdateToLocation:(CLLocation *)newLocation
           fromLocation:(CLLocation *)oldLocation
{
NSTimeInterval locationAge = abs([oldLocation.timestamp timeIntervalSinceNow]);

    NSString *timeinNSString = [NSString stringWithFormat:@"%f", locationAge];

    NSLog(@"Location Age is %@", timeinNSString);
}

But NSlog always prints 0. any Idea what I am missing here?
Thanks for any help in advance.

Answer 1

abs() doesn’t work with floating point numbers. Use fabs() instead. In the future, use breakpoints and step through your code in the debugger to check where it actually fails.