calloutAccessoryControlTapped 委托方法必须命名为 mapView（annotationView：calloutAccessoryControlTapped ：）。

The calloutAccessoryControlTapped delegate method must be named mapView(annotationView:calloutAccessoryControlTapped:).

您不能使用自己的名字，如 pinPressed（...）。

You can't use your own name like pinPressed(...).

这适用于任何委托方法，并由协议规定。

This applies to any delegate method and is dictated by the protocol.

所以它应该be：

func mapView(mapView: MKMapView!, annotationView: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {

    if control == annotationView.rightCalloutAccessoryView {
        println("Disclosure Pressed!")
    }
}