Question

The following code returns me “no annotation selected” CalloutAccessories delegates helps to figure out which annotation selected. my code is below. Any idea(s)? Thanks in advance

“RemoveViewController.m”

- (IBAction)removePin:(id)sender {
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
[[appDelegate viewController] removeAnno];
[self.navigationController popViewControllerAnimated:YES];

}

“ViewController.m”

- (void)mapView:(MKMapView *)mapView 
 annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control {

    if ([(UIButton*)control buttonType] == UIButtonTypeDetailDisclosure){
        // Do your thing when the detailDisclosureButton is touched
        RemoveViewController *settingAnnotation = [[RemoveViewController alloc]initWithNibName:@"RemoveViewController" bundle:nil];
        Annotation *annotation1;
        annotation1 = view.annotation;
        settingAnnotation.title = annotation1.title;
        settingAnnotation.subtitle = annotation1.subtitle;
        [self.navigationController pushViewController:settingAnnotation animated:YES];
    } 

}

- (void)removeAnno{

    [mapView removeAnnotations: mapView.selectedAnnotations];
    if (mapView.selectedAnnotations.count == 0)
    {
        NSLog(@"no annotation selected");
    }
    else
    {
        id<MKAnnotation> ann = [mapView.selectedAnnotations objectAtIndex:0];
        CLLocationCoordinate2D coord = ann.coordinate;
        NSLog(@"lat = %f, lon = %f", coord.latitude, coord.longitude);
    }
}

Answer 1

Yes, get the annotation (if any) at index 0 of the selectedAnnotations array and read its coordinate property:

if (mapView.selectedAnnotations.count == 0)
{
    NSLog(@"no annotation selected");
}
else
{
    id<MKAnnotation> ann = [mapView.selectedAnnotations objectAtIndex:0];
    CLLocationCoordinate2D coord = ann.coordinate;
    NSLog(@"lat = %f, lon = %f", coord.latitude, coord.longitude);
}

You should probably do this before calling removeAnnotations.