我如何确定哪一个是点击MKAnnotation？(How Do I Determine Which

我是一个菜鸟到iPhone发展问题浅析和我试图确定注解的int值，所以我可以再采取int值和交叉引用它到一个数组中获得相应的值。然而，当我尝试用.TAG方法获取int值的值总是返回为零。如果我有5个annontations我需要能够确定哪些annontation是0,1,2,3和4。任何帮助是极大的赞赏。

我的代码

- (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:

标签属性是必须设置的东西。我想你不会在任何地方设置它。

当然，对于您创建使用buttonWithType的UIButton的。默认标签值为0，那么你总是会得到0，要求标签视图（按钮）后立即被创建。

Answer 2:

下面写代码来获得索引值

- (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];
  }
}

与我以前的帖子https://stackoverflow.com/a/34742122/3840428