MKReverseGeocoder 设置哪个注释的副标题

Question

我正在使用 MKReverseGeocoder 对纬度/经度地址进行反向地理编码。但是，我无法确定要设置哪个注释的副标题。为了稍微扩展一下，我在每个注释上调用反向地理编码来确定地址，然后我想将它们的字幕文本设置为其地址。我已经成功地为第一个注释做到了这一点，但我不确定如何为第二个注释做到这一点。

这是我的代码：

- (void)loadAnnotations {
Annotation *annotation1 = [[Annotation alloc] initWithCoordinate:CLLocationCoordinate2DMake(a,b)];
annotation1.title = @"Anno1n";
CLLocation *annoe = [[CLLocation alloc] initWithLatitude:annotation1.coordinate.latitude longitude:annotation1.coordinate.longitude];
CLLocation *usrloc = [[CLLocation alloc] initWithLatitude:mapView.userLocation.coordinate.latitude longitude:mapView.userLocation.coordinate.longitude];
NSLog(@"%.2f km", [annoe distanceFromLocation:usrloc]/1000);
MKReverseGeocoder *geo = [[MKReverseGeocoder alloc] initWithCoordinate:annotation1.coordinate];
[geo setDelegate:self];
[geo start];
[mapView addAnnotation:annotation1];

Annotation *annotation2 = [[Annotation alloc] initWithCoordinate:CLLocationCoordinate2DMake(c,d)];
annotation2.title = @"Anno2";
geo = [[MKReverseGeocoder alloc] initWithCoordinate:annotation2.coordinate];
[geo start];
[mapView addAnnotation:annotation2];

}
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark {
NSArray *array = [[placemark addressDictionary] objectForKey:@"FormattedAddressLines"];
if (geocoder.coordinate.latitude == mapView.userLocation.coordinate.latitude && geocoder.coordinate.longitude) {
    mapView.userLocation.title = @"Current Location";
    mapView.userLocation.subtitle = [NSString stringWithFormat:@"%@ %@", [array objectAtIndex:0], [array objectAtIndex:1]];
}
else {
    Annotation *annot = (Annotation *)[[mapView annotations] objectAtIndex:1];
    [annot setSubtitle:[NSString stringWithFormat:@"%@ %@", [array objectAtIndex:0], [array objectAtIndex:1]]];
    //NSLog(@"%@", [placemark addressDictionary]);
}
}

请让我知道如何做到这一点。

Answer 1

不建议循环遍历您的注释并对每一项进行反向地理编码。反向地理编码服务有使用限制。 Apple 建议开发人员仅在由用户操作（例如选择注释）触发时调用反向地理编码服务。

http://developer.apple.com/library/ios/#documentation/MapKit/Reference/MKReverseGeocoder_Class/Reference/Reference.html%23//apple_ref/occ/cl/MKReverseGeocoder