Detail disclosure send data from custom annotation - ios

Question

I have pins showing on a map with data from a JSON string from a db. I set the id of the pin (defined in a custom class) but I need to pass the ID to a action when pressing the detail disclosure button.
It will then open a new view with some information on that pin (via a database and it will lookup the row id and return the data, not sure how im going to do that just yet)
This is the code:
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
[spinner stopAnimating];
// json parsing
results = [NSJSONSerialization JSONObjectWithData:data options:nil error:nil];
NSMutableArray * locations = [[NSMutableArray alloc] init];
CLLocationCoordinate2D location;
CustomAnnotation * myAnn;
NSArray *pins = mapView.annotations;
if ([pins count])
{
[mapView removeAnnotations:pins];
}
/* loop through the array, each key in the array has a JSON String with format:
* title <- string
* strap <- string
* id <- int
* date <- date
* lat <- floating point double
* long <- floating point double
* link <- string
*/
int i;
for (i = 0; i < [results count]; i++) {
//NSLog(#"Result: %i = %#", i, results[i]);
//NSLog(#"%#",[[results objectAtIndex:i] objectForKey:#"long"]);
myAnn = [[CustomAnnotation alloc] init];
location.latitude = (double)[[[results objectAtIndex:i] objectForKey:#"lat"] doubleValue];
location.longitude = (double)[[[results objectAtIndex:i] objectForKey:#"long"] doubleValue];
myAnn.coordinate = location;
myAnn.title = [[results objectAtIndex:i] objectForKey:#"title"];
myAnn.subtitle = [[results objectAtIndex:i] objectForKey:#"strap"];
myAnn.pinId = [[results objectAtIndex:i] objectForKey:#"id"];
NSLog(#"id: %i", myAnn.pinId);
[locations addObject:myAnn];
//NSLog(#"%i", [[results objectAtIndex:i] objectForKey:#"lat"]);
}
[self.mapView addAnnotations:locations];
}
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation{
static NSString *s = #"ann";
MKAnnotationView *pin = [mapView dequeueReusableAnnotationViewWithIdentifier:s];
if (!pin) {
pin = [[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:s];
pin.canShowCallout = YES;
//pin.image = [UIImage imageNamed:#"pin.png"];
pin.calloutOffset = CGPointMake(0, 0);
UIButton *button = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
[button addTarget:self
action:#selector(viewDetails) forControlEvents:UIControlEventTouchUpInside];
pin.rightCalloutAccessoryView = button;
}
return pin;
}
-(void)viewDetails{
NSLog(#"press");
}

Answer 1

seems to me that you wish to detect which annotation is selected or its accessory view is clicked.
use the following method
-(void) mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
available to detect the callout tap action. But rather than setting the tag of button, tag the mkannotationView which you will provide for display of you annotation
-(MKAnnotationView*) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
Some of the best tutorials are
http://www.raywenderlich.com/21365/introduction-to-mapkit-in-ios-6-tutorial