How Do I Determine Which MKAnnotation is clicked? - iphone

Question

I'm a noob to iphone developoment and i am trying to determine the int value of an annotation so I can then take that int value and cross reference it to an array to get a corresponding value. However, when i try to get the int value with the .tag method the value always returns as zero. If I have 5 annontations I need to be able to determine which annontation is 0,1,2,3 and 4. Any help is greatly appreciated.
MY CODE
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view{
if (view.selected==YES) {
NSInteger annotationIndex = view.tag; //Always returns zero
NSLog(#"annotationIndex: %i", annotationIndex);
}
}
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
// Define your reuse identifier.
static NSString *identifier = #"MapPoint";
if ([annotation isKindOfClass:[MapPoint class]]) {
MKPinAnnotationView *annotationView = (MKPinAnnotationView *) [self.mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if (annotationView == nil) {
annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
} else {
annotationView.annotation = annotation;
}
annotationView.enabled = YES;
annotationView.canShowCallout = YES;
annotationView.animatesDrop = YES;
UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
NSInteger clickIndex = rightButton.tag; //Always returns zero, despite there being 5 annotations
NSLog(#"buttonIndex: %i", clickIndex);
[rightButton addTarget:self
action:#selector(showDetails:)
forControlEvents:UIControlEventTouchUpInside];
annotationView.rightCalloutAccessoryView = rightButton;
return annotationView;
}
return nil;
}

Answer 1

The tag property is something you have to set. I think you're not setting it anywhere.
Certainly for the UIButton that you create using buttonWithType. The default tag value is 0, so you're always going to get 0 asking for the tag right after the view (Button) is created.

Answer 2

Write below code to get index value
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view {
// Annotation is your custom class that holds information about the annotation
if ([view.annotation isKindOfClass:[Annotation class]]) {
Annotation *annot = view.annotation;
NSInteger index = [self.arrayOfAnnotations indexOfObject:annot];
}
}
With my previous post https://stackoverflow.com/a/34742122/3840428