How can i make custom pin and use FollowWithHeading mode together?

Question

The following code below is show custom pin (picture as pin). it can use normally.

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {

   PVAttractionAnnotationView *annotationView = [[PVAttractionAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"Attraction"];
   annotationView.canShowCallout = YES;
   return annotationView;

}

Then use following code to show current location

[self.mapView setUserTrackingMode:MKUserTrackingModeFollowWithHeading];

XCODE jump to main.m and show

Thread 1:Signal SIGABRT

On the other hand if i use the following code

[self.mapView setUserTrackingMode:MKUserTrackingModeFollowWithHeading];

and unused all of the following code

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {

   PVAttractionAnnotationView *annotationView = [[PVAttractionAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"Attraction"];
   annotationView.canShowCallout = YES;
   return annotationView;

}

Application will show current location normally but it's not show custom pin. It's show the red pin that is the default of system cause i've unused that code.

How can i make custom pin and use FollowWithHeading mode together?

..I'm sorry I do not use English well.

Paulw11 · Accepted Answer · 2014-04-08T23:03:25.750

You need a slight change to your viewForAnnotation that examines the class of the annotation and returns the appropriate view. By returning nil the system will use the default view. You also need some additional code to implement view re-use correctly -

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    MKAnnotationView *annotationView=nil;
    if ([annotation isKindOfClass:[PVAttractionAnnotation class]])  // Note - put your custom annotation class here
    {
        annotationView =(MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:@"Attraction"];
        if (annotationView == nil)
        {
            annotationView = [[PVAttractionAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"Attraction"];  
            annotationView.canShowCallout = YES; 
        }
        else
        {
            annotationView.annotation=annotation;
        }

    }
    return annotationView;
}

A slight correction which can be critical: If the dequeue returns a view, the code should update the annotation property of the re-used view otherwise the re-used view will be linked to the wrong annotation. So for the inner `if`, add an `else` part: `if (annotationView == nil) { ... } else { annotationView.annotation = annotation; }`. The setting of `canShowCallout` can actually be moved inside the block where the view is created (after the init) since it doesn't change per annotation. — , Apr 08 '14 at 22:52

How can i make custom pin and use FollowWithHeading mode together?

1 Answers1