Question

我试图获取用户当前位置的经度/纬度，我的代码就是这样：

MyLocationManager.h

@interface MyLocationManager : NSObject

+(MyLocationManager*)sharedInstance;
-(void)checkAndStartLocationManager;
-(void)stopUpdatingLocation;
@end

MyLocationManager.m

+ (MyLocationManager*)sharedInstance
{
    static id  _sharedInstance = nil;

    static dispatch_once_t oncePredicate;
dispatch_once(&oncePredicate, ^{
    _sharedInstance = [[self alloc] init];
    MyLocationManager *instance = _sharedInstance;
    instance.locationManager = [CLLocationManager new];
    instance.locationManager.delegate = instance;
    instance.locationManager.distanceFilter = 100;
    instance.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    instance.locationManager.pausesLocationUpdatesAutomatically = YES;
    instance.locationManager.activityType = CLActivityTypeOtherNavigation;
});
return _sharedInstance;
}

-(void)checkAndStartLocationManager
{
switch([CLLocationManager authorizationStatus])
{
    case kCLAuthorizationStatusAuthorizedWhenInUse:
        [self startUpdatingLocation];
        break;

    case kCLAuthorizationStatusNotDetermined:
            if ([self.locationManager respondsToSelector:
                 @selector(requestWhenInUseAuthorization)])
            {
                [self.locationManager requestWhenInUseAuthorization];
            }
        }
        break;

    case kCLAuthorizationStatusRestricted:
        break;

    case kCLAuthorizationStatusDenied:
        break;

    case kCLAuthorizationStatusAuthorizedAlways:
        [self startUpdatingLocation];
        break;

        default:
        break;
}
}

-(void)startUpdatingLocation
{
  [self.locationManager startUpdatingLocation];
}

- (void)locationManager:(CLLocationManager *)manager
didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
switch([CLLocationManager authorizationStatus])
{
    case kCLAuthorizationStatusAuthorizedWhenInUse:
        [self startUpdatingLocation];
        break;

    case kCLAuthorizationStatusNotDetermined:
        break;

    case kCLAuthorizationStatusRestricted:
        break;

    case kCLAuthorizationStatusDenied:
        break;

    case kCLAuthorizationStatusAuthorizedAlways:
        [self startUpdatingLocation];
        break;

        default:
        break;
}
}

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:    (NSArray *)locations
{
    CLLocation *location = [locations lastObject];
    NSString*locationInfo = [NSString stringWithFormat:@"lat - %f, lon -  %f", location.coordinate.latitude, location.coordinate.longitude];
    NSLog(@"Location is %@", locationInfo);
   [self.locationManager stopUpdatingLocation];
}

- (void)locationManager:(CLLocationManager *)manager didFailWithError: (NSError *)error
{
    NSLog(@"didFailWithError: %@", error);
}

我正在使用ios 8并在iphone 5设备上进行测试。每当我打电话时，

[[MyLocationManager sharedInstance] checkAndStartLocationManager];

如果手机上的wifi打开，则只有

didUpdateLocations

正在被召唤。如果 wifi关闭且只有 3G开启，则我始终收到错误，

错误Domain = kCLErrorDomain Code = 0“无法完成操作。（kCLErrorDomain错误0。）”

请帮助!!!

Answer 1

设备使用WiFi通过众包热点快速确定位置，尽管结果可能不准确。禁用WiFi时，唯一剩下的可能是使用GPS模块。但是，如果你在某个建筑物或GPS信号不够强大，确定你的位置需要更多的时间，你会得到一段时间的消息

startUpdatingLocation仅在wifi打开时才起作用，但在只有3G打开时才起作用

1 个答案: