如何从iOS中的地图图钉获取位置

Question

I am using the MKMapView object and I am able to create pins and place them on the map. What I am trying to do now is get the information back from the pin. For example in my

- (MKAnnotationView*) mapView:(MKMapView *)mapView viewForAnnotation (id<MKAnnotation>)annotation

I create my pins and set them on the map. I am also creating buttons to use when a user clicks on the pin. All that works well and good. Now my question is when that button is clicked how do I get information from that clicked pin? Below is a small sample code of how I currently have it setup. Any advice would be greatly appreciated.

- (MKAnnotationView*) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
    MKPinAnnotationView *annView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"location"];
    annView.pinColor = MKPinAnnotationColorRed;
    annView.animatesDrop = YES;
    annView.canShowCallout = YES;
    annView.calloutOffset = CGPointMake(-5, 5);

    UIButton* callout = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    [callout addTarget:self action:@selector(loadDetails:) forControlEvents:UIControlEventTouchUpInside];
    annView.rightCalloutAccessoryView = callout;
    return annView;
}

- (void)loadDetails:(id)sender
{
    //TODO: Get pin coordinates or address and match it back to an array of available address to show details in a new view
}

Any advice is greatly appreciated

Answer 1

You should create a class that derives from MKPinAnnotationView that has a property of id<MkAnnotationView> . During the method above, create this new object instead of the MKPinAnnotationView and set the id<MKAnnotation> property to the annotation passed in.

Answer 2

Instead of setting the target of your callout, respond to the delegate method

mapView:annotationView:calloutAccessoryControlTapped:

The annotationView will have an annotation property with the coordinate.