MTLocation How-To

gistfile1.m

// MTLocation How-To

- (void)viewDidLoad {
    [super viewDidLoad];
 
    // 1. Create MapView
    self.mapView = [MKMapView mapViewInSuperview:self.view];

    // 2. Create BarButtonItem
    self.locationItem = [MTLocateMeBarButtonItem userTrackingBarButtonItemForMapView:self.mapView]; // @property (nonatomic, strong) UIBarButtonItem *locationItem;
    self.navigationItem.rightBarButtonItem = self.locationItem;

    // 3. Configure MTLocationDelegate
    [MTLocationManager sharedInstance].mapView = self.mapView;
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    
     self.mapView.showsUserLocation = YES;
    
    [self.locationItem startListeningToLocationUpdates];
    [self.locationItem setFrameForInterfaceOrientation:$appOrientation];
    
	// begin listening to end-heading notifications
	[[NSNotificationCenter defaultCenter] addObserver:self
						 selector:@selector(locationManagerDidStopUpdatingHeading:)											    
                                                     name:kMTLocationManagerDidStopUpdatingHeading
						   object:nil];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    
    [[MTLocationManager sharedInstance] stopAllServices];
    [self.locationItem stopListeningToLocationUpdates];
    self.mapView.showsUserLocation = NO;
    
    // end listening to location update notifications
    [[NSNotificationCenter defaultCenter] removeObserver:self name:kMTLocationManagerDidStopUpdatingHeading object:nil];
}

- (void)locationManagerDidStopUpdatingHeading:(NSNotification *)notification {
	// rotate map back to Identity-Transformation
    [self.mapView resetHeadingRotationAnimated:YES];
}