iOS9でMKMapViewのピンのアイコン画像が表示されなくなった時の対処方法

MKPinAnnotationViewでなく、MKAnnotationViewを使います。

Before

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

    CustomAnnotation* ca = (CustomAnnotation*)annotation;

    static NSString *PinIdentifier = @"Pin";
    MKPinAnnotationView* av = (MKPinAnnotationView *)[mapView 
                    dequeueReusableAnnotationViewWithIdentifier:PinIdentifier];

    if (!av) {
        av = [[MKPinAnnotationView alloc] initWithAnnotation:annotation
                    reuseIdentifier:PinIdentifier];
        av.canShowCallout = YES;
        av.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    }

    av.image = [UIImage imageNamed:@"image.png"];
    av.annotation = annotation;

    return av;
}

After

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


    CustomAnnotation* ca = (CustomAnnotation*)annotation;

    static NSString *PinIdentifier = @"Pin";
    MKAnnotationView * av = (MKAnnotationView  *)[mapView
                    dequeueReusableAnnotationViewWithIdentifier:PinIdentifier];

    if (!av) {
        av = [[MKAnnotationView alloc] initWithAnnotation:annotation
                    reuseIdentifier:PinIdentifier];
        av.canShowCallout = YES;
        av.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    }

    av.image = [UIImage imageNamed:@"image.png"];
    av.annotation = annotation;

    return av;
}