iOS 7 - Custom Map Callout - ios

Question

I'm trying to create a custom map callout that looks like so:
As you can see, I need custom pins and custom callouts. The color of the pins are based on a rating as is the color of the circle in the callout.
Here's the code that I have so far:
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
if ([annotation isKindOfClass:[CustomAnnotation class]])
{
static NSString *identifier = #"CustomAnnotation";
MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[self.map dequeueReusableAnnotationViewWithIdentifier:identifier];
if (annotationView == nil)
{
annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
annotationView.enabled = YES;
annotationView.canShowCallout = NO;
annotationView.animatesDrop = NO;
}
else
{
annotationView.annotation = annotation;
}
CustomAnnotation *myAnnotation= (CustomAnnotation *)annotation;
// Based on the score, set the pin image
if ([myAnnotation.score intValue] == 1)
{
annotationView.image = [UIImage imageNamed:#"dot_purple_xsmall.png"];
}
else if (...)
{
// and so on...
}
return annotationView;
}
return nil;
}
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view
{
if (![view.annotation isKindOfClass:[MKUserLocation class]])
{
CustomCalloutView *callout = CustomCalloutView *)[[[NSBundle mainBundle]loadNibNamed:#"MyCallout" owner:self options:nil] objectAtIndex:0];
CGRect calloutViewFrame = callout.frame;
calloutViewFrame.origin = CGPointMake(-calloutViewFrame.size.width / 2 + 15, -calloutViewFrame.size.height);
callout.frame = calloutViewFrame;
// TODO: Set the outlets of the xib
callout.nameLabel.text = #"Testing";
[view addSubview:callout];
}
}
- (void)mapView:(MKMapView *)mapView didDeselectAnnotationView:(MKAnnotationView *)view
{
for (UIView *subView in view.subviews)
{
[subView removeFromSuperview];
}
}
The custom pins work fine but when I tap on a pin, all I get is a black view. The app also uses a Navigation and Tab Controller.