show user location on a map and stop location - iphone

Question

Here is my goal:
I have to show the user location with his address on a map every time he open the view that has the MapView and then stop location to save battery. So far i can do it, but if the user moves to another area and enter the view (after leave it) the location does not change.
Here is my code:
- (void)viewDidLoad
{
mapView.mapType = MKMapTypeStandard;
self.locationManager.delegate = self;
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[super viewDidLoad];
}
- (void)viewDidAppear:(BOOL)animated{
if(!self.locationManager){
self.locationManager = [[CLLocationManager alloc] init];
}
[self.locationManager startUpdatingLocation];
}
-(void)viewDidDisappear:(BOOL)animated{
self.locationManager = nil;
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
MKCoordinateRegion viewRegion =
MKCoordinateRegionMakeWithDistance(newLocation.coordinate, 2000, 2000);
MKCoordinateRegion adjustedRegion = [mapView regionThatFits:viewRegion];
[mapView setRegion:adjustedRegion animated:YES];
[manager stopUpdatingLocation];
MKReverseGeocoder *geocoder = [[MKReverseGeocoder alloc]
initWithCoordinate:newLocation.coordinate];
geocoder.delegate = self;
[geocoder start];
}
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark {
MapLocation *annotation = [[MapLocation alloc] init];
annotation.streetAddress = placemark.thoroughfare;
annotation.city = placemark.locality;
annotation.state = placemark.administrativeArea;
annotation.zip = placemark.postalCode;
annotation.coordinate = geocoder.coordinate;
[mapView addAnnotation:annotation];
geocoder.delegate = nil;
}
- (void)openCallout:(id<MKAnnotation>)annotation {
[mapView selectAnnotation:annotation animated:YES];
}
- (MKAnnotationView *) mapView:(MKMapView *)theMapView viewForAnnotation:(id <MKAnnotation>) annotation {
static NSString *placemarkIdentifier = #"Map Location Identifier";
if ([annotation isKindOfClass:[MapLocation class]]) {
MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[theMapView dequeueReusableAnnotationViewWithIdentifier:placemarkIdentifier];
if (annotationView == nil) {
annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:placemarkIdentifier];
}
else{
annotationView.annotation = annotation;
}
annotationView.enabled = YES;
annotationView.canShowCallout = YES;
annotationView.image = [UIImage imageNamed:#"rescue"];
[self performSelector:#selector(openCallout:) withObject:annotation afterDelay:0.5];
return annotationView;
}
return nil;
}
I have a CLLocationManager on another view that get user location without a map (here the location is working just fine). If a start the location on that view and go back to the view with the map it's is updated. Why that?
Any ideias?

Answer 1

- (void)loadView {
MKMapView *mv = [[MKMapView alloc]init];
mapView.showsUserLocation=YES;
mv.delegate=self;
}
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation{
[mapView setCenterCoordinate:mapView.userLocation.location.coordinate animated:YES];
mapView.showsUserLocation=NO;
}

Answer 2

well to display it on the map
MKMapView *mv = [[MKMapView alloc]init];
CLLocationCoordinate2D c = CLLocationCoordinate2DMake(locationManager.location.coordinate.latitude, locationManager.location.coordinate.longitude);
[mv setCenterCoordinate:c animated:YES];
and to stop updating
[locationManager stopUpdatingLocation];