ios - CLLocation Manager startUpdatingLocation第二次调用不起作用

Question

嗨，我正在我的应用程序中实现位置服务。首先，我必须知道我的坐标才能获得列表中某些位置与设备之间的距离。然后，如果我去某个地方可以进行检查，那么我需要再次获取坐标，问题就在这里。第二次我尝试获取坐标时，没有调用-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations方法。并且我无法获取新的坐标。

我的经理位于具有以下代码的NSObject子目录中:

(id)init {
    if ( self = [super init] ) {
        if ([CLLocationManager locationServicesEnabled])
        {
            locationManager = [[CLLocationManager alloc] init];
            locationManager.delegate = self;
             [locationManager startUpdatingLocation];
        }
    }
    return self;
}

-(void) checkLongLatitudeAgain {
    [locationManager startUpdatingLocation];
}

#pragma mark Delegates de CLLocationManager
//
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
     NSLog(@"LON%f",  manager.location.coordinate.longitude);
    NSLog(@"LAT:%f", manager.location.coordinate.latitude);
    NSTimeInterval howRecentNewLocation = [newLocationeventDate timeIntervalSinceNow];

    if (manager.location.horizontalAccuracy <= 100.0 && howRecentNewLocation < -0.0 && howRecentNewLocation > -20.0){
        //Usar coordenada
        [self.delegate getLocationForCheckIn:manager.location];
        [self stopUpdatingLocation:@"Fins"];
    }
}
// ---------------------------------------------------------------------------------------------------------------------
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
    //
    if ([error code] != kCLErrorLocationUnknown) {
        [self stopUpdatingLocation:NSLocalizedString(@"Error", @"Error")];
    }
    //
}
// ---------------------------------------------------------------------------------------------------------------------
- (void)stopUpdatingLocation:(NSString *)state {
    //Detenemos la lectura del GPS
    [locationManager stopUpdatingLocation];
    locationManager.delegate = nil;
    NSLog(@"Stop gps");
    //
}

打开场所列表时，以及在场所内用户按下checkIn按钮时，我都叫该类。两次我都使用此代码:

WPLocationManager *location = [[WPLocationManager alloc]init];
[location checkLongLatitudeAgain];

Answer 1

您每次都在创建新的经理:

WPLocationManager *location = [[WPLocationManager alloc]init];
[location checkLongLatitudeAgain];

该新经理未分配给任何代表。

您需要使用之前创建并分配给您的代表的经理，例如:

[locationManager checkLongLatitudeAgain];