Question

I have this following function implemented in my app

There are no errors at compile time. Yet I cannot see the right accessory button on my map annotations in the simulator. I see the annotation, its just that there is no button on it.
Is there a trick to this that Im missing?

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

    //Set upt the right accessory button
    UIButton *myDetailAccessoryButton = [UIButton 
    buttonWithType:UIButtonTypeDetailDisclosure];
    myDetailAccessoryButton.frame = CGRectMake(0, 0, 23, 23);
    myDetailAccessoryButton.contentVerticalAlignment = 
    UIControlContentVerticalAlignmentCenter;
    myDetailAccessoryButton.contentHorizontalAlignment = 
    UIControlContentHorizontalAlignmentCenter;

    [myDetailAccessoryButton addTarget:self
                            action:nil
                  forControlEvents:UIControlEventTouchUpInside];

     if ([annotation isKindOfClass:[Vendor class]])
     {

       MKPinAnnotationView *annotationView = (MKPinAnnotationView *) [self.mapView

       dequeueReusableAnnotationViewWithIdentifier:identifier];
       if (annotationView == nil)
      {
        annotationView = [[MKPinAnnotationView alloc]
                          initWithAnnotation:annotation
                          reuseIdentifier:identifier];
        annotationView.rightCalloutAccessoryView = myDetailAccessoryButton;
        annotationView.enabled = YES;
        annotationView.canShowCallout = YES;
        annotationView.calloutOffset = CGPointMake(-5, 5);

    }
    else
    {
        annotationView.annotation = annotation;
    }

    return annotationView;
     }

     return nil;
   }

EDIT
This code worked but the above one doesn’t.

Why is that?

   if ([annotation isMemberOfClass:[MKUserLocation class]])
    return nil;

 MKPinAnnotationView *annView=[[MKPinAnnotationView alloc]
                               initWithAnnotation:annotation
                               reuseIdentifier:@"currentloc"];


   UIButton *myDetailButton = [UIButton 
   buttonWithType:UIButtonTypeDetailDisclosure];
    myDetailButton.frame = CGRectMake(0, 0, 23, 23);
    myDetailButton.contentVerticalAlignment = 
    UIControlContentVerticalAlignmentCenter;
    myDetailButton.contentHorizontalAlignment = 
   UIControlContentHorizontalAlignmentCenter;

[myDetailButton addTarget:self
                   action:nil
         forControlEvents:UIControlEventTouchUpInside];

    annView.rightCalloutAccessoryView = myDetailButton;

   annView.animatesDrop=NO;
   annView.canShowCallout = YES;
   annView.calloutOffset = CGPointMake(-5, 5);
   return annView;

Answer 1

Are you sure you’re adding annotations of type Vendor?

Because the first code block only sets the rightCalloutAccessoryView for annotations of type Vendor. For any other type, it returns nil resulting in a generic callout (no buttons).

The second code block sets the rightCalloutAccessoryView for any annotation type except MKUserLocation.

By the way, you’ve set the button action to nil which means nothing will happen when it’s tapped.