How to find which annotation send showDetails?

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The comments in your code have the answer. Instead of using a custom method and calling addTarget, use the map view’s calloutAccessoryControlTapped delegate method. In this method, you will get a reference to the annotation view which contains a reference to the annotation.

Remove the call to addTarget and replace your “showDetails” method with:

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view 
    calloutAccessoryControlTapped:(UIControl *)control
{
    MyAnnotationClass *annot = (MyAnnotationClass *)view.annotation;
    //do something...
}

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