must implement title when canShowCallout is YES

Question

I'm getting this exception when trying to show the callout on my map annotation, even if the title is set.

This is the init method I'm using in my MapAnnotation class:

- (id)initWithTitle:(NSString *)ttl subtitle:(NSString *)sub andCoordinate:(CLLocationCoordinate2D)c2d {
    titles = ttl;
    coordinate = c2d;
    subtitle = sub;
    return self;
}

Then, somewhere in another class I'm creating the annotations (2 in two different methods):

MapAnnotation *annotation = [[MapAnnotation alloc] initWithTitle:[formatter stringFromDate:sourceDate] subtitle:@"test" andCoordinate:CLLocationCoordinate2DMake(point.latitude, point.longitude)];
[self.mapView addAnnotation:annotation];

And this is the annotations method:

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation{
    if (annotation == mapView.userLocation)
        return nil;

    static NSString *s = @"ann";
    MKAnnotationView *pin = [mapView dequeueReusableAnnotationViewWithIdentifier:s];
    if (!pin) {
        pin = [[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:s];
        pin.canShowCallout = YES;
        pin.image = [UIImage imageNamed:@"pin.png"];
        pin.calloutOffset = CGPointMake(0, 0);
    }
    return pin;
}

Another thing I'd like to do is use two different images for the two map annotations. Any idea?

Thanks.

Jeanicejeanie

what error are you getting? – Ricoricochet

@Ricoricochet the one in the question's title. – Jeanicejeanie

there is no error message or anything – Ricoricochet

if the title is your error message, then the meaning seems clear enough :D – Ricoricochet

Answer 1

you MapAnnotation should contain title property, not titles for map callout to work. Declare it as follows

@property (nonatomic, copy) NSString *title;

Woodborer

pin is a MKAnnotationView object, there's no title property for it. – Jeanicejeanie

my MapAnnotation does contain a title property. – Jeanicejeanie

No, it is named as titles not title as you have posted in your question above. – Woodborer

Look at your MapAnnotation's initWithTitle method. – Woodborer

let us continue this discussion in chat – Woodborer

@Idindu: declared the same, it is unused. Still crash is there. – Ellanellard