iOS refresh annotations on mapview

Question

I have a mapview where the annotation\'s coordinates are constantly being updated but when I use setCoordinate, the annotation does not move. How do I refresh the annotation

Answer 1

Try using [self.mapView removeAnnotations:self.mapView.annotations]:

- (void)viewDidAppear:(BOOL)animated
{

[super viewDidAppear:animated];

[self.mapView removeAnnotations:self.mapView.annotations];

PFQuery *query = [PFQuery queryWithClassName:@"caches"];

[query findObjectsInBackgroundWithBlock:^(NSArray *comments, NSError *error)
 {
     for (PFObject *comment in comments)
     {
         NSString *tit = comment[@"titulo"];
         NSString *lat = comment[@"latitud"];
         NSString *lon = comment[@"longitud"];

         float latFloat = [lat floatValue];
         float lonFloat = [lon floatValue];

         CLLocationCoordinate2D Pin;
         Pin.latitude = latFloat;
         Pin.longitude = lonFloat;
         MKPointAnnotation *annotationPoint = [[MKPointAnnotation alloc]init];
         annotationPoint.coordinate = Pin;
         annotationPoint.title = tit;

         [self.mapView addAnnotation:annotationPoint];

     }

 }];
}