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.

if the title is your error message, then the meaning seems clear enough :D — Daij-Djan, Dec 24 '13 at 12:33

ldindu · Accepted Answer · 2013-12-24T11:15:40.210

11

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

@property (nonatomic, copy) NSString *title;

edited Dec 24 '13 at 11:15

answered Dec 24 '13 at 10:02

ldindu

4,270
2
20
24

pin is a MKAnnotationView object, there's no title property for it. – Aleph72 Dec 24 '13 at 10:21
my MapAnnotation does contain a title property. – Aleph72 Dec 24 '13 at 10:38
No, it is named as titles not title as you have posted in your question above. – ldindu Dec 24 '13 at 10:39
Look at your MapAnnotation's initWithTitle method. – ldindu Dec 24 '13 at 10:39
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/43821/discussion-between-ldindu-and-aleph72) – ldindu Dec 24 '13 at 10:55
@Idindu: declared the same, it is unused. Still crash is there. – Vineesh TP Jan 16 '16 at 07:15

must implement title when canShowCallout is YES

1 Answers1