Clean solution to know which MKAnnotation has been tapped? - cocoa-touch

Question

Ok, so you typically have some object X you want to be annotated inside a MKMapView. You do this way:
DDAnnotation *annotation = [[DDAnnotation alloc] initWithCoordinate: poi.geoLocation.coordinate title: #"My Annotation"];
[_mapView addAnnotation: annotation];
Then you create the annotation view inside
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation;
And when some callout gets tapped, you handle the event inside:
- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control;
What's the cleanest solution to pass X down to the latest tap event?

Answer 1

If I'm understanding your question, you should add a reference or property to your DDAnnotation class so that in your calloutAccessoryControlTapped method you can access the object.
#interface DDAnnotation : NSObject <MKAnnotation> {
CLLocationCoordinate2D coordinate;
id objectX;
}
#property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
#property (nonatomic, retain) id objectX;
When you create the annotation:
DDAnnotation *annotation = [[DDAnnotation alloc] initWithCoordinate:poi.geoLocation.coordinate title: #"My Annotation"];
annotation.objectX = objectX;
[_mapView addAnnotation: annotation];
Then:
- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control{
DDAnnotation *anno = view.annotation;
//access object via
[anno.objectX callSomeMethod];
}

Answer 2

I did this and it worked alright!
It's exactly what I need because I needed to do something when the map was tapped but letting the tap into the annotation flow normally.
- (void)viewDidLoad
{
[super viewDidLoad];
UIGestureRecognizer *g = [[[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleGesture:)] autorelease];
g.cancelsTouchesInView = NO;
[self.mapView addGestureRecognizer:g];
}
- (void) handleGesture:(UIGestureRecognizer*)g{
if( g.state == UIGestureRecognizerStateEnded ){
NSSet *visibleAnnotations = [self.mapView annotationsInMapRect:self.mapView.visibleMapRect];
for ( id<MKAnnotation> annotation in visibleAnnotations.allObjects ){
UIView *av = [self.mapView viewForAnnotation:annotation];
CGPoint point = [g locationInView:av];
if( [av pointInside:point withEvent:nil] ){
// do what you wanna do when Annotation View has been tapped!
return;
}
}
//do what you wanna do when map is tapped
}
}