MKPointAnnotation not working - objective-c

Question

Hello i got this method:
-(void)adresseZeigen
{
NSLog(#"%s",__PRETTY_FUNCTION__);
selectedAnnotation = [[MKPointAnnotation alloc]init];
selectedAnnotation.title = selectedCompanyName;
selectedAnnotation.subtitle = selectedCompanyAdresse;
selectedAnnotation.coordinate = selectedCompanyPoint;
NSLog(#"selected title: %#",selectedAnnotation.title);
NSLog(#"selected subtitle: %#",selectedAnnotation.subtitle);
NSLog(#"selected latitude is: %f", self.selectedAnnotation.coordinate.latitude );
NSLog(#"selected longitude is: %f", self.selectedAnnotation.coordinate.longitude );
[mapView addAnnotation:selectedAnnotation];
MKCoordinateRegion selectedRegion;
selectedRegion.center = selectedCompanyPoint;
selectedRegion.span.longitudeDelta = 0.01;
selectedRegion.span.latitudeDelta = 0.01;
[mapView setRegion:selectedRegion animated:YES];
}
it should actually give me a annotation in my mapview.
My Log output is:
-[SecondViewController adresseZeigen]
selected title: Company 2
selected subtitle: Company 2 Adresse
selected latitude is: 48.620000
selected longitude is: 9.460000
but somehow I dont get a annotation on map.
Can someone please help me?

Answer 1

This alone is not gonna give you any actual annotation views on the map. In order to have annotation views in your map, you need to declare the MKMapViewDelegate for your view controller, declare it as your mapview delegate and implement the method:
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
This is the method that actually produces the annotation view for the map view. In your case you might want to use an MKPinAnnotationView for your MKPointAnnotation!
You can check the protocol reference here.
EDIT: An example implementation of the method (that assumes that all of your MKPointAnnotations have the same purpose) could be:
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
static NSString *reuseId = #"MyReuseID";
MKPinAnnotationView * view = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:reuseId];
if (!view) {
view = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:reuseId];
//custom setup of your view, such as
//view.canShowCallout = YES;
}
return view;
}