Core location gives old location whenever comes from background - ios

Question

I have a CoreLocation manager in VC, when user pressed "get direction" button, I initalize location manager, and app opens google map direction with current location and some pre defined destination location.
Here is my problem, if app is not in background state, current location nearly always true, bu if app calling from background in same VC and user pressed again "get direction" button , current location generally shows old locations. In short, I'm troubling with multitasking and timestamp of retrieved locations did not solved my problem.
IBAction:
if ( self.locationManager ) {
[_locationManager release];
self.locationManager = nil;
}
self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self;
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
self.locationManager.distanceFilter = kCLDistanceFilterNone;
self.locationTimer = [NSTimer scheduledTimerWithTimeInterval:LOCATION_TIMER target:self selector:#selector(stopUpdatingLocationTimer) userInfo:nil repeats:NO];
HUD = [MBProgressHUD showHUDAddedTo:self.navigationController.view animated:YES];
[self.locationManager startUpdatingLocation];
Core Location Delegate:
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
NSTimeInterval locationAge = -[newLocation.timestamp timeIntervalSinceNow];
NSLog(#"%f",locationAge);
if (locationAge > 3.0)
return;
if (newLocation.horizontalAccuracy < 0)
return;
if ( self.currentLocation == nil || self.currentLocation.horizontalAccuracy > newLocation.horizontalAccuracy ) {
self.currentLocation = newLocation;
if (self.currentLocation.horizontalAccuracy <= self.locationManager.desiredAccuracy) {
[self stopUpdatingLocations:YES];
}
}
}

Answer 1

In your example locationAge is a negative representation of the number of seconds since the timestamp of newLocation. This means that locationAge will never be greater than 3 and you're effectively letting every update through the sieve.
Set locationAge like this:
NSTimeInterval locationAge = [newLocation.timestamp timeIntervalSinceNow];

Answer 2

For those who encounter same problem,
Also, some tutorials related with core location on web, lead me this problem.
Of course, I keep CLLocation ivar in my VC, whenever CLLocation ivar
sets and google maps called, my app goes to background.
Then, my app calls from background by user, and start updating locations,
and old CLLocation ivar is not nil and probably best horizantal accuracy then
newly comes. Therefore;
if ( self.currentLocation == nil || self.currentLocation.horizontalAccuracy > newLocation.horizontalAccuracy )
this line cause problems, and old location in CLLocation ivar
never replaced.
So I changed viewDidDisappear like this and I assigned nil value to CLLocation variable and works perfectly.
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
[self.locationManager stopUpdatingLocation]; // CLLocationManager
self.locationManager = nil;
[self.locationTimer invalidate]; // NSTimer
self.locationTimer = nil;
self.currentLocation = nil; // CLLocation
}
p.s : thank you Mark Adams