按钮标题不显示带注释

Question

Here's my problem. I created a red pin with a button thanks to my viewForAnnotation method.But the button doesn't show. Here my code:

-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id                 <MKAnnotation>)annotation
 {
     //static NSString *defaultPinID = @"identifier";

MKPinAnnotationView *pinView = (MKPinAnnotationView*)[mapView dequeueReusableAnnotationViewWithIdentifier:@"identifier"];

if ( pinView == nil )
{
    pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"identifier"];

    pinView.enabled = YES;
    pinView.pinColor=MKPinAnnotationColorRed;
    pinView.canShowCallout = YES;

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeInfoDark];
    [btn setTitle:@"test" forState:UIControlStateNormal];

    pinView.rightCalloutAccessoryView = btn;
}
else
{
    pinView.annotation = annotation;
}
pinView.annotation = annotation;

return pinView;
}

Can someone help me plz?

Answer 1

1. Have you added the annotation to you map?
2. Have you set the MKMapView's delegate?
3. Does your viewForAnnotation function get called?