Periodic background location - using desired accuracy and distance filter

Question

I am trying to use this technique in iOS7 to get a location every x seconds - Periodic iOS background location updates.

In my didUpdateLocations:

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    [self.locationManager setDesiredAccuracy:kCLLocationAccuracyKilometer];
    [self.locationManager setDistanceFilter:9999];
}

When i run this, i seem to get a loop. setDesiredAccuracy: - i think this forces an update itself, on change. This is why I am getting a loop, would this be right? When I comment these out, it acts like I expect it too. Is there anyway to stop it get location when i set these?

Answer 1

Sounds like you should set some kind of time/date stamp on how often you call "setDesiredAccuracy". If you call it once, don't call it again for some certain period of time.

something like:

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    NSTimeInterval secondsSinceLastResetOfAccuracy = [lastResetTime timeIntervalSinceNow];
    if(secondsSinceLastResetOfAccuracy > 60 * 60) // one hour
    {    
        [self.locationManager setDesiredAccuracy:kCLLocationAccuracyKilometer];
        [self.locationManager setDistanceFilter:9999];
        lastResetTime = [NSDate date]; // new "time stamp"
    }
}