无法检测到 iBeacon 蓝牙何时关闭 iOS

Question

我正在编写两个简单的应用程序。一个是信标应用程序，您可以通过轻触按钮来启动或停止其信号。另一种是接收器应用程序，它在检测到信标信号时编辑标签的文本。

我尝试使用 didDetermineStateForRegion、didExitRegion 和 didEnterRegion 方法来检测应用程序何时运行。这些可以很好地确定接收器何时移入和移出信标附近，但确定我已关闭信标上的蓝牙大约需要 30 秒。我也尝试将我的 CLLocationManager 的 pausesLocationUpdatesAutomatically 字段设置为 NO，但同样的事情。理想情况下，它会立即在我的标签上加上“不”；我该怎么做？

MyView.h

@interface MyView : UIViewController

@property (weak, nonatomic)   IBOutlet UILabel *statusLabel;
@property (strong, nonatomic) CLBeaconRegion   *myBeaconRegion;
@property (strong, nonatomic) CLLocationManager *locationManager;

@end

MyView.m

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

    // Initialize location manager and set ourselves as the delegate
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;
    self.locationManager.pausesLocationUpdatesAutomatically=NO;

    // Create a NSUUID with the same UUID as the broadcasting beacon
    NSUUID *uuid = [[NSUUID alloc] initWithUUIDString:@"ID"];

    // Setup a new region with that UUID and same identifier as the broadcasting beacon
    self.myBeaconRegion = [[CLBeaconRegion alloc] initWithProximityUUID:uuid
                                        identifier:@"identifier"];

    // Tell location manager to start monitoring for the beacon region
    [self.locationManager startMonitoringForRegion:self.myBeaconRegion];
}

- (void)locationManager:(CLLocationManager*)manager didEnterRegion:(CLRegion*)region
{
[self.locationManager startRangingBeaconsInRegion:self.myBeaconRegion];
self.statusLabel.text = @"Yes";
}

- (void)locationManager:(CLLocationManager *)manager didDetermineState:(CLRegionState)state forRegion:(CLRegion *)region {
if (state == CLRegionStateInside) {
    self.statusLabel.text = @"Yes";
} else {
    self.statusLabel.text = @"No";
}

}

-(void)locationManager:(CLLocationManager*)manager didExitRegion:(CLRegion*)region
{
[self.locationManager stopRangingBeaconsInRegion:self.myBeaconRegion];
self.statusLabel.text = @"No";
}

Answer 1

区域监控非常慢，您可以将其用于更一般的通知，以便在您靠近 iBeacon 时通知您。我认为对于这种情况，您可能希望使用didRangeBeacons，您的检测应用程序将每秒收到信标信号强度通知。您可以使用此信号强度来决定您是否不再看到信标（CoreLocation 在信标消失几秒钟后往往仍会“看到”信标）。

只需将以下方法添加到您的委托：

-(void)locationManager:(CLLocationManager*)manager
       didRangeBeacons:(NSArray*)beacons
              inRegion:(CLBeaconRegion*)region

然后开始为您所在的地区进行测距：

[locationManager startRangingBeaconsInRegion:(CLBeaconRegion*)region];