显示地图注释内的图像

Question

使用下面的代码，我可以显示标题和副标题，并且我想在其中显示图像。这可能吗？如果是这样，请帮帮我。

MKPointAnnotation *aAnnotationPoint = [[MKPointAnnotation alloc] init];

aAnnotationPoint.title = @"Virginia";

aAnnotationPoint.subtitle = @"Test of sub title";

// Add the annotationPoint to the map
[myMapView addAnnotation:aAnnotationPoint];

Answer 1

我假设您在注释的标注中显示标题和副标题（如果您使用的是图钉，则点击图钉时会出现灰色框）。如果是这样，标注有两个视图供您自定义（leftCalloutAccessoryView 和 rightCalloutAccessoryView（两者均在注释视图上设置）），

因此，如果您希望在点击图钉时图像出现在图钉上方的灰色框中，您可以执行以下操作因此，通过实现这样的委托方法来自定义注释视图：

-(MKAnnotationView*)mapView:(MKMapView*)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
  // If you are showing the users location on the map you don't want to change it
  MKAnnotationView *view = nil;
  if (annotation != mapView.userLocation) {
    // This is not the users location indicator (the blue dot)
    view = [mapView dequeueReusableAnnotationViewWithIdentifier:@"myAnnotationIdentifier"];
    if (!view) {
      // Could not reuse a view ...

      // Creating a new annotation view, in this case it still looks like a pin
      view = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"myAnnotationIdentifier"] autorelease];
      view.canShowCallOut = YES; // So that the callout can appear

      UIImageView *myImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"someName"]];
      myImageView.frame = CGRectMake(0,0,31,31); // Change the size of the image to fit the callout

      // Change this to rightCallout... to move the image to the right side
      view.leftCalloutAccessoryView = myImageView;
      [myImageView release], myImageView = nil;
    }
  }
  return view;
}

但是，如果您想要的只是直接在地图上（而不是在标注中）显示大量图像，那么您可以使用相同的委托方法，设置注释视图的“image”属性，如下所示：

-(MKAnnotationView*)mapView:(MKMapView)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
      // If you are showing the users location on the map you don't want to change it
      MKAnnotationView *view = nil;
      if (annotation != mapView.userLocation) {
        // This is not the users location indicator (the blue dot)
        view = [mapView dequeueReusableAnnotationViewWithIdentifier:@"myAnnotationIdentifier"];
        if (!view) {
          // Could not reuse a view ...

          // Creating a new annotation view
          view = [[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"myAnnotationIdentifier"] autorelease];

          // This will rescale the annotation view to fit the image
          view.image = [UIImage imageNamed:@"someName"];
        }
      }
     return view;
}

我希望能回答您的问题