1
我想要地圖獲取用戶的位置，他可以通過在地圖上貼上來更改位置。問題是當點擊位置的方法（void）mapView：（MKMapView *）mapView_ didUpdateUserLocation，調用和地圖顯示當前位置和他點擊的位置！我想只有一個位置>>>Mapkit添加新的註釋並刪除舊的
這裏是問一個問題每一頁上的代碼
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
self.mapView.delegate = self;
locationManager = [[CLLocationManager alloc] init];
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
[mapView addGestureRecognizer:singleTap];
}
- (void)mapView:(MKMapView *)mapView_ didUpdateUserLocation:(MKUserLocation *)userLocation
{
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
longitudeLabel.text = [NSString stringWithFormat:@"%.8f", userLocation.coordinate.longitude];
latitudeLabel.text = [NSString stringWithFormat:@"%.8f", userLocation.coordinate.latitude];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(userLocation.coordinate, 800, 800);
[mapView setRegion:[mapView regionThatFits:region] animated:YES];
// Add an annotation
MKPointAnnotation *point = [[MKPointAnnotation alloc] init];
point.coordinate = userLocation.coordinate;
point.title = @"Where am I?";
point.subtitle = @"I'm here!!!";
[mapView addAnnotation:point];
}
- (void)handleSingleTap:(UIGestureRecognizer *)sender
{
CLLocationCoordinate2D coord = [mapView convertPoint:[sender locationInView:mapView] toCoordinateFromView:mapView];
NSLog(@"Map touched %f, %f.", coord.latitude, coord.longitude);
longitudeLabel.text = [NSString stringWithFormat:@"%.8f", coord.longitude];
latitudeLabel.text = [NSString stringWithFormat:@"%.8f", coord.latitude];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(coord, 800, 800);
[mapView setRegion:[mapView regionThatFits:region] animated:YES];
// Add an annotation
MKPointAnnotation *point = [[MKPointAnnotation alloc] init];
point.coordinate = coord;
point.title = @"Where am I?";
point.subtitle = @"I'm here!!!";
[mapView removeAnnotations:[mapView annotations]];
[mapView addAnnotation:point];
}