Sample VC implementing shared location manager using KVO

gistfile1.m

- (void)dealloc {

  [super dealloc];
  
  [[CWCLocationManager sharedInstance] removeObserver:self 
                                           forKeyPath:@"currentLocation"];
}

- (id)init {
  
  self = [super init];
  
  if (self) {
    
  }
  
  return self;
}

- (void)viewDidUnload {

  [super viewDidUnload];
  
  [[CWCLocationManager shareInstance] removeObserver:self forKeyPath:@"currentLocation"];
}

- (void)viewDidLoad {

  [super viewDidLoad];
  
  CWCLocationManager *manager = [CWCLocationManager sharedInstance];
  
  [manager addObserver:self
            forKeyPath:@"currentLocation"
               options:NSKeyValueObservingOptionNew
               context:NULL];
}


#pragma mark - Public Methods

- (void)callSuperCoolMethodThatNeedsCoordinate:(CLLocationCoordinate2D)coord {
  // post something cool from location
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
  
  if ([keyPath isEqual:@"currentLocation"]) {
    
    if ([CWCLocationManager sharedInstance].currentLocation) {
      
      [[CWCLocationManager sharedInstance] stop];
      
      CLLocationCoordinate2D currentLoc = [CWCLocationManager sharedInstance].currentLocation.coordinate;

      [self callSuperCoolMethodThatNeedsCoordinate:currentLoc];      
    }
    
  } else {

    [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
  }
}