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我想检索当前位置并将其与 POST 请求一起发送到服务器。我使用mapView.userLocation.location.coordinate但它不起作用并且总是显示 0.0 表示 lat 和 0.0 表示 lng。这是我的控制器的 .h：

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>

@interface CustomViewController : UIViewController 
<MKMapViewDelegate>

@property NSMutableArray * shops;
@property (strong, nonatomic) IBOutlet UIActivityIndicatorView *loadingIcon;
@property (weak, nonatomic) IBOutlet MKMapView *mapView;

@end

而这个 .m ：

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    _mapView.showsUserLocation = YES;

    _mapView.delegate = self;

    _shops = [[NSMutableArray alloc] init];

    [_loadingIcon startAnimating];

    CLLocationCoordinate2D coordinate;
    coordinate = _mapView.userLocation.location.coordinate;
    NSNumber *lat = [NSNumber numberWithDouble:coordinate.latitude];
    NSNumber *lng = [NSNumber numberWithDouble:coordinate.longitude];

   //here the post method
    NSArray *keys = [NSArray arrayWithObjects:@"lat", @"lng", nil];
    NSArray *objects = [NSArray arrayWithObjects:lat,lng, nil];
    NSDictionary *jsonDictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys];

    NSData *jsonData ;
    NSString *jsonString;
    if([NSJSONSerialization isValidJSONObject:jsonDictionary])
    {
        jsonData = [NSJSONSerialization dataWithJSONObject:jsonDictionary options:0 error:nil];
        jsonString = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];
    }

......

    NSLog(@"posizione %@", jsonString);

}

在日志中我总是有 0.0 0.0。

我也有这个方法：

- (void)mapView:(MKMapView *)mapView didUpdateUserLocation: (MKUserLocation *)userLocation
{
    [_mapView setCenterCoordinate:userLocation.location.coordinate animated:YES];
    userLocation.title = @"Posizione attuale";
    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(userLocation.location.coordinate, 2000, 2000);
    [_mapView setRegion:region animated:YES];

    NSLog(@"lat %f", (double)userLocation.location.coordinate.latitude);
}

在这种情况下，日志显示当前位置。有人有想法吗？

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