ios - 从 MKLocalSearch 创建注释标题

Question

我已经添加了一个 MKLocalSearch，并且引脚显示正确。唯一的问题是别针标题有名字和地址，我只想要名字。我将如何改变这个。这是我正在使用的代码 -

- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{

    MKLocalSearchRequest *request = [[MKLocalSearchRequest alloc] init];
    request.naturalLanguageQuery = @"School";
    request.region = mapView.region;

    MKLocalSearch *localSearch = [[MKLocalSearch alloc] initWithRequest:request];
    [localSearch startWithCompletionHandler:^(MKLocalSearchResponse *response, NSError *error) {

        NSMutableArray *annotations = [NSMutableArray array];

        [response.mapItems enumerateObjectsUsingBlock:^(MKMapItem *item, NSUInteger idx, BOOL *stop) {

            // if we already have an annotation for this MKMapItem,
            // just return because you don't have to add it again

            for (id<MKAnnotation>annotation in mapView.annotations)
            {
                if (annotation.coordinate.latitude == item.placemark.coordinate.latitude &&
                    annotation.coordinate.longitude == item.placemark.coordinate.longitude)
                {
                    return;
                }
            }

            // otherwise, add it to our list of new annotations
            // ideally, I'd suggest a custom annotation or MKPinAnnotation, but I want to keep this example simple
            [annotations addObject:item.placemark];
        }];

        [mapView addAnnotations:annotations];
    }];
} 

Answer 1

由于 item.placemark 的 title 不能直接修改，您需要创建自定义注释或 MKPointAnnotation 使用来自 item.placemark 的值。

(addObject 行上方代码中的注释提到了“MKPinAnnotation”，但我认为它的意思是“MKPointAnnotation”。)

下面的示例使用了简单的选项，即使用 SDK 提供的预定义 MKPointAnnotation 类来创建您自己的简单注释。

替换这一行:

[annotations addObject:item.placemark];

这些:

MKPlacemark *pm = item.placemark;

MKPointAnnotation *ann = [[MKPointAnnotation alloc] init];
ann.coordinate = pm.coordinate;
ann.title = pm.name;    //or whatever you want
//ann.subtitle = @"optional subtitle here";

[annotations addObject:ann];