title: iOS MapView add MKPointAnnotation which coordinate is (0, 0) not showing
body: <p>I am trying to add annotations on <code>MKMapView</code>. The annotations can show up when the coordinates are not <code>(0, 0)</code>, but when I set the annotation's coordinate as (0, 0), the annotation view can NOT show up.</p>
  
  <p>On the iPhone XS simulator and device, only one annotation showing(location (10, 0)), the location(0, 0) not show up.</p>
  
  <p>It seem that the (0, 0) annotation is add at the bottom of the map, not at the west side of Africa.</p>
  
  <p>Any suggestion is appreciated.</p>
  
  <pre><code>- (void)viewWillAppear:(BOOL)animated {
      [super viewWillAppear:animated];
      // Add Annotation
      MKPointAnnotation *annotation = [[MKPointAnnotation alloc] init];
      annotation.coordinate = CLLocationCoordinate2DMake(0, 0);
      [self.mapView addAnnotation:annotation];
      MKPointAnnotation *annotationZero = [[MKPointAnnotation alloc] init];
      annotationZero.coordinate = CLLocationCoordinate2DMake(10, 0);
      [self.mapView addAnnotation:annotationZero];
  }
  
  #pragma mark - MKMapViewDelegate
  - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id&lt;MKAnnotation&gt;)annotation {
      if ([annotation isKindOfClass:[MKPointAnnotation class]]) {
          static NSString *reuseIdentifier = @"map_annotation";
          MKAnnotationView *annotationView = [_mapView dequeueReusableAnnotationViewWithIdentifier:reuseIdentifier];
          if (annotationView == nil) {
              annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:reuseIdentifier];
          }
          annotationView.image = [UIImage imageNamed:@"annotation_icon"];
          return annotationView;
      }
      return nil;
  }
  </code></pre>