Question

代码在这里。它基本上有效，但我已经迷失了方向，无法弄清楚如何从[geocoder]例程中获取“point.title”。 point.title是Mapkit注释事物的一部分。我可以注释掉，把一个简单的字符串放入point.title，但是我不能让它做的是返回完整的'locatedAT'或者确实是任何placemark.subLocality例如。项目

    - (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation {

MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(userLocation.coordinate, 800, 800);
[self.mapView setRegion:[self.mapView regionThatFits:region] animated:YES];

// Add an annotation
MKPointAnnotation *point = [[MKPointAnnotation alloc] init];
point.coordinate = userLocation.coordinate;
//point.title = @"Where am I?";
//point.subtitle = @"I'm here!!!";
////////////////////////
CLGeocoder *geocoder = [[CLGeocoder alloc] init];
CLLocation *loc = [[CLLocation alloc]initWithLatitude:userLocation.coordinate.latitude longitude:userLocation.coordinate.longitude];

[geocoder reverseGeocodeLocation: loc
               completionHandler:^(NSArray* placemarks, NSError* error){
                   CLPlacemark *placemark = [placemarks objectAtIndex:0];
                   if (placemark) {

                       // NSLog(@"placemark %@",placemark);
                       //String to hold address
                       NSString *locatedAt = [[placemark.addressDictionary valueForKey:@"FormattedAddressLines"] componentsJoinedByString:@", "];
                      // NSLog(@"addressDictionary %@", placemark.addressDictionary);

                     //  NSLog(@"placemark %@",placemark.region);
                     //  NSLog(@"placemark %@",placemark.country);  // Give Country Name
                     //  NSLog(@"placemark %@",placemark.locality); // Extract the city name

                     //  NSLog(@"location %@",placemark.name);
                     //  NSLog(@"location %@",placemark.ocean);
                     //  NSLog(@"location %@",placemark.postalCode);
                     //  NSLog(@"location %@",placemark.subLocality);

                       //Print the location to console
                     //  NSLog(@"I am currently at %@",locatedAt);

                      point.title = locatedAt;

                   }
                   else {
                       NSLog(@"Could not locate");
                   }
}
 ];
///////////////////////////

NSLog(@"point.title %@",point.title);

[self.mapView addAnnotation:point];
[self.mapView selectAnnotation:point animated:YES]; }

Answer 1

我通过简单地添加/修改以下内容来使我的代码正常工作。我无法理解它为什么会起作用，因为point.title = locatedAt会覆盖最终的point.title = @＆＃34;我在这里＆＃34 ;;那是在牙箍之外。因为如果我取出那两个point.title和point.sustitle行，它就不再打印引脚上的实际地理位置。

                       //Print the location to console
                      //NSLog(@"I am currently at %@",locatedAt);


                      point.title = locatedAt;

                   }
                   else {
                       NSLog(@"Could not locate");
                   }

    }
 ];
point.title = @"Where am I";
   // NSLog(@"point.title %@",point.title);
point.subtitle = @"I'm here!!!";

[self.mapView addAnnotation:point];
[self.mapView selectAnnotation:point animated:YES]; }

我无法从例程中获取坐标的locateAt geocodeLocation

1 个答案: