Question

- (void)viewDidLoad
{
    [super viewDidLoad];
     NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
     config.URLCache = [[NSURLCache alloc] initWithMemoryCapacity:2 * 1024 * 1024
                                                    diskCapacity:10 * 1024 * 1024
                                                        diskPath:@"MarkerData"];
    self.markerSession = [NSURLSession sessionWithConfiguration:config];


    locationManager = [[CLLocationManager alloc] init];
    NSLog(@"locationServicesEnabled: %@", [CLLocationManager locationServicesEnabled] ? @"YES":@"NO");

    CLLocationManager *lm = [[CLLocationManager alloc] init];
    lm.delegate = self;
    lm.desiredAccuracy = kCLLocationAccuracyBest;
    lm.distanceFilter = kCLDistanceFilterNone;
    [lm startUpdatingLocation];
    //[lm stopUpdatingLocation];

    CLLocation *location = [lm location];

    CLLocationCoordinate2D coord;
    coord.longitude = location.coordinate.longitude;
    NSString *ss= [NSString stringWithFormat:@"%.8f",coord.longitude ];

    coord.latitude = location.coordinate.latitude;
    NSString *aa= [NSString stringWithFormat:@"%.8f",coord.latitude ];
    NSLog(@"oooooooo2");
    NSLog(ss);
    NSLog(aa);
    NSLog(@"kkkkkkkkk2");

}

Answer 1

CLLocationManager是异步的。当底部的代码执行时，它将没有机会获得位置。您应该实施CLLocationManagerDelegate的方法，例如–locationManager:didUpdateLocations:：

@interface MyClass() <CLLocationManagerDelegate>

@end

@implementation MyClass

- (void)viewDidLoad
{
    ...
    CLLocationManager *lm = [[CLLocationManager alloc] init];
    lm.delegate = self;
    ...
}

- (void)locationManager:(CLLocationManager *)locationManager didUpdateLocations:(NSArray *)locations
{
    CLLocation *location = [locationManager location];
    CLLocationCoordinate2D coord;
    coord.longitude = location.coordinate.longitude;
    etc...
}

@end

如果你有这样的事情，有人也提出了block-based version。

ios - locationManager返回0.0000

1 个答案: