标签中位置的准确性

Question

我仍然是xcode的初学者和整个目标-C。

我正在创建一个应用程序，您可以在屏幕上看到您的坐标（它仍处于开始阶段）

但是用户无法看到坐标的准确程度......我可以在调试区看到，但使用该应用程序的用户无法看到它。

如何在我的代码中添加？

我的代码目前是：

#import "CurrentLocationViewController.h"

@interface CurrentLocationViewController ()

@end

@implementation CurrentLocationViewController
{
CLLocationManager *_locationManager;
CLLocation *_location;

BOOL _updatingLocation;

NSError *_lastLocationError;


}

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

[self updateLabels];
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}


- (IBAction)getLocation:(id)sender
{
[self startLocationManager];
[self updateLabels];

}


- (id) initWithCoder:(NSCoder *)aDecoder
{
if ((self = [super initWithCoder:aDecoder])) {
    _locationManager = [[CLLocationManager alloc] init];

}
  return self;
}

pragma mark - CLLocationManagerDelegate

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

if (error.code == kCLErrorLocationUnknown) {
    return;
}

[self stopLocationManager];
_lastLocationError = error;

[self updateLabels];

}

- (void) locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
CLLocation *newLocation = [locations lastObject];
NSLog(@"didUpdateLocations %@", newLocation);

_lastLocationError = nil;
_location = newLocation;
[self updateLabels];
}


- (void) updateLabels

{
if (_location !=nil) {
    self.latitudeLabel.text = [NSString     stringWithFormat:@"%.8f",_location.coordinate.latitude];
    self.longitudeLabel.text = [NSString stringWithFormat:@"%.8f",_location.coordinate.longitude];
    self.tagButton.hidden = NO;
    self.messageLabel.text = @"Here are your coordinates";
}
else {
    self.latitudeLabel.text= @"";
    self.longitudeLabel.text= @"";
    self.adressLabel.text= @"";
    self.tagButton.hidden = YES;

    NSString *statusMessage;
    if (_lastLocationError != nil) {
        if ([_lastLocationError.domain isEqualToString:kCLErrorDomain] && _lastLocationError.code == kCLErrorDenied) {
            statusMessage = @"Location Services Disabled";
        } else {
            statusMessage = @"Error getting location";
        }
    } else if (![CLLocationManager locationServicesEnabled]) {
        statusMessage = @"Location Services Disabled";
    } else if (_updatingLocation) {
        statusMessage = @"Searching...";
    } else {
        statusMessage = @"Press the Button to start";
    }

    self.messageLabel.text = statusMessage;

}

}

- (void) startLocationManager
{
if ([CLLocationManager locationServicesEnabled]) {
    _locationManager.delegate = self;
    _locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
    [_locationManager startUpdatingLocation];
    _updatingLocation = YES;
}
}


- (void) stopLocationManager
{
if (_updatingLocation) {
    [_locationManager stopUpdatingLocation];
    _locationManager.delegate = nil;
    _updatingLocation = NO;
}
}

@end

@end

Answer 1

horizontalAccuracy是CLLocation的属性。它以米为单位报告当前的水平精度。这意味着您的真实位置距离报告的任何方向位置都要horizontalAccuracy米 参考您的updateLabels代码，您可以访问_location.horizontalAccuracy并将其与其他信息一起显示 有一个类似的属性verticalAccuracy。