iOS 地理位置(总是返回该位置在英国伦敦)

Question

我多年来一直在寻找一种解决方案，让我可以通过 Wi-Fi 显示我的设备位置，但实际上并未连接到任何网络。所以它只是打开了 Wi-Fi，但是我尝试过的每一种方法都会返回我位于伦敦的信息。有谁知道为什么会发生这种情况？

我正在使用的方法

- (void)viewDidLoad
{
    [super viewDidLoad];

    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;
    locationManager.desiredAccuracy = kCLLocationAccuracyKilometer;
    locationManager.distanceFilter = 1000;

#ifdef __IPHONE_8_0
    if(IS_OS_8_OR_LATER) {
        // Use one or the other, not both. Depending on what you put in info.plist
        [self.locationManager requestWhenInUseAuthorization];
        [self.locationManager requestAlwaysAuthorization];
    }
#endif

    if ([self shouldFetchUserLocation])
    {
        [locationManager startUpdatingLocation];
    }

    // Do any additional setup after loading the view.
}

---

-(BOOL)shouldFetchUserLocation
{

BOOL shouldFetchLocation= NO;

if ([CLLocationManager locationServicesEnabled])
{
    switch ([CLLocationManager authorizationStatus])
    {
        case kCLAuthorizationStatusAuthorized:
            shouldFetchLocation= YES;
            break;
        case kCLAuthorizationStatusDenied:
        {
            UIAlertView *alert= [[UIAlertView alloc]initWithTitle:@"Error" message:@"App level settings has been denied" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles: nil];
            [alert show];
            alert= nil;
        }
            break;
        case kCLAuthorizationStatusNotDetermined:
        {
            UIAlertView *alert= [[UIAlertView alloc]initWithTitle:@"Error" message:@"The user is yet to provide the permission" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles: nil];
            [alert show];
            alert= nil;
        }
            break;
        case kCLAuthorizationStatusRestricted:
        {
            UIAlertView *alert= [[UIAlertView alloc]initWithTitle:@"Error" message:@"The app is recstricted from using location services." delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles: nil];
            [alert show];
            alert= nil;
        }
            break;

        default:
            break;
    }
}
else{
    UIAlertView *alert= [[UIAlertView alloc]initWithTitle:@"Error" message:@"The location services seems to be disabled from the settings." delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles: nil];
    [alert show];
    alert= nil;
}

return shouldFetchLocation;
}

---

- (void)locationManager:(CLLocationManager *)manager
     didUpdateLocations:(NSArray *)locations {

    NSLog(@"location fetched in delegate");

    CLLocation* location = [locations lastObject];
    NSDate* eventDate = location.timestamp;
    NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];

    if (fabs(howRecent) < 15.0) {
        // If the event is recent, do something with it.
        NSLog(@"inside loop.... latitude %+.6f, longitude %+.6f\n",
              location.coordinate.latitude,
              location.coordinate.longitude);
    }
    NSLog(@"latitude %+.6f, longitude %+.6f\n",
          location.coordinate.latitude,
          location.coordinate.longitude);
    NSLog(@"\nlatitude: %+.6f \nlongitude:   %+.6f", location.coordinate.latitude, location.coordinate.longitude);

    [locationManager stopUpdatingLocation];
    [locationManager stopMonitoringSignificantLocationChanges];

    if(locationManager!=nil){
        locationManager.delegate= nil;
        locationManager= nil;
    }
}

输出:

(不带要点的输出)

• 在委托(delegate)中获取位置
• 内部循环...纬度+51.509980，经度-0.133700
• 纬度+51.509980，经度-0.133700
• 纬度:+51.509980
• 经度:-0.133700

Answer 1

您需要移动此代码:

[locationManager stopUpdatingLocation];
[locationManager stopMonitoringSignificantLocationChanges];

返回有效位置后调用的另一个函数。现在你只让 locationManage 更新你的位置一次，这很可能是一个缓存位置(伦敦？)。在返回有效位置之前，通常需要多次调用 didUpdateLocations 委托(delegate)。

更新:

根据 OP 的要求...这里有一些关于基于 OP 提供的附加信息的定位服务的更多信息。

如果您的设备没有 GPS 并且您没有连接到网络(手机/WiFi)，那么您所要求的是不可能的。要接收位置数据，您至少需要以下其中一项:

1. 您设备中的 GPS 芯片
2. 手机服务连接到网络
3. WiFi 服务已连接到网络

如果至少不满足上述条件之一，您将无法接收位置数据。如果设备中没有 GPS 芯片，则会使用网络连接(手机信号塔/WiFi)来计算您的位置。为此，设备会根据其连接的网络确定位置信息。这可以是手机信号塔位置或已知 IP 地址位置和 WiFi 位置。这种方法不如 GPS 准确，但它通常可以更快地返回位置数据并且使用更少的电池电量。