Question

I have a map view with pins annotations into it. I need to pass to the detail view the coordinates of a pin when the user press the disclosure button of the pin information. How can I get the coordinates of the pin when I am into the showDetails method? I am using the next code.

- (void)showDetails:(id)sender {

 DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil ];

    // HERE I NEED TO PASS THE COORDINATES OF THE PIN TO THE DETAILVIEWCONTROLLER.
    [self.navigationController pushViewController:detailViewController animated:YES];
 [detailViewController release];
}


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

 // If it's the user location, just return nil.
 if ([annotation isKindOfClass:[MKUserLocation class]])
  return nil;
 else { // Handles the other annotations.
  // Try to dequeue an existing pin view first.
  static NSString *AnnotationIdentifier = @"AnnotationIdentifier";
  MKPinAnnotationView *pinView = (MKPinAnnotationView *)[self.mapView dequeueReusableAnnotationViewWithIdentifier:AnnotationIdentifier];

  if (!pinView) {
   // If an existing pin view was not available, creates one.
   MKPinAnnotationView *customPinView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:AnnotationIdentifier] autorelease];
   customPinView.animatesDrop = YES;
   customPinView.canShowCallout = YES;

   // Adds a detail disclosure button.
   UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
   [rightButton addTarget:self action:@selector(showDetails:) forControlEvents:UIControlEventTouchUpInside];
   customPinView.rightCalloutAccessoryView = rightButton;

   return customPinView;
  } else
   pinView.annotation = annotation;
 }

 return nil;
}

Thanks for reading.

Answer 1

I cannot give you a working code solution right now since i don’t have my mac here. But I can tell you about a possible approach.

Create a method in DetailViewController that populates its attributes, so you can call it from showDetails, before you push it. So the sequence of events would be like this.

Click on disclosure button -> showDetails called -> DetailViewController created and populated -> push DetailViewController

Hope this helped you