How to save the selected MKAnnotation?

Question

I have an app that has a mapview, and it shows 20 pins (from an Array) on the map. When the user clicks on it, it can show a bubble with a right accessory button. Here come my problem: How do I know which pin was pressed? I heard something about the mapView:didSelectAnnotationView method, but I don't really understand how do you get the pin/callout index, so that I can get the information of the object at the same index of my Array? Thanks for any help!

Answer 1

When that method gets called -- because your viewController class has adopted MKMapViewDelegate, you can call -indexOfObject on the array and get the index of that pin (annotation). This is with the assumption that your array holds objects of the kind of annotation class.

- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view {
        // Annotation is your custom class that holds information about the annotation
        if ([view.annotation isKindOfClass:[Annotation class]]) {
            Annotation *annot = view.annotation;
            NSInteger index = [self.arrayOfAnnotations indexOfObject:annot];
        }
    }

If you need more explanation, we need to know how you are adding those pins, i.e. implementation of - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation.