ios - stopRangingBeaconsInRegion 有可能停止受监控区域的通知吗？

Question

我正在做一个使用 CLLocationManager 的示例项目。

我调用 startMonitoringForRegion。然后，我开始用其他设备模拟一个信标，didEnterRegion 被调用。

在 didEnterRegion 中，我调用了 startRangingBeaconsInRegion 并且工作正常。

然后，我暂停信标发射器并调用 didExitRegion。在 didExitRegion 中，我调用了 stopRangingBeaconsInRegion。

如果我再次启动信标发射器，则不会调用 didEnterRegion。

我在 Apple 文档中找到了这个:

stopRangingBeaconsInRegion: Stops the delivery of notifications for the specified beacon region.

stopRangingBeaconsInRegion 是否有可能停止对受监控区域的通知？

我在没有 stopRangingBeaconsInRegion 的情况下尝试了同样的方法并且工作正常。

谢谢

添加更多信息:

NSUUID *UUID = [[NSUUID alloc] initWithUUIDString:@"77777777-1717-2727-7777-777777777777"];
NSString *identifier = @"MyBeaconRegion";
CLBeaconRegion *region = [[CLBeaconRegion alloc] initWithProximityUUID:UUID identifier:identifier];
[_locationManager startMonitoringForRegion:region];

- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region {
    NSLog(@"didEnterRegion");
    [_locationManager startRangingBeaconsInRegion:(CLBeaconRegion*)region];
    NSLog(@"StartRangingBeacons");
}

- (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region {
    NSLog(@"didExitRegion");
    [_locationManager stopRangingBeaconsInRegion:(CLBeaconRegion*)region];
    NSLog(@"StopRangingBeacons");

}

- (void)locationManager:manager didRangeBeacons:(NSArray *)beacons inRegion:(CLBeaconRegion *)region {
    for (CLBeacon *beacon in beacons) {
        NSLog(@"Ranging Beacon: %@ and proximity: %f", beacon.proximityUUID.UUIDString, beacon.accuracy);
    }
}

还有一些日志:

2015-01-13 09:46:30.559 RegionMonitoring[188:5314] didEnterRegion
2015-01-13 09:46:30.561 RegionMonitoring[188:5314] StartRangingBeacons
2015-01-13 09:46:31.579 RegionMonitoring[188:5314] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.008799
2015-01-13 09:46:32.575 RegionMonitoring[188:5314] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.011362
2015-01-13 09:46:33.580 RegionMonitoring[188:5314] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.012814
2015-01-13 09:46:34.580 RegionMonitoring[188:5314] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.012909
2015-01-13 09:46:35.579 RegionMonitoring[188:5314] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.012915
2015-01-13 09:46:36.579 RegionMonitoring[188:5314] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.011501
2015-01-13 09:46:37.576 RegionMonitoring[188:5314] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.010177
2015-01-13 09:46:38.576 RegionMonitoring[188:5314] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.013618
2015-01-13 09:46:39.578 RegionMonitoring[188:5314] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 09:46:40.573 RegionMonitoring[188:5314] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 09:46:41.578 RegionMonitoring[188:5314] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 09:46:42.575 RegionMonitoring[188:5314] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 09:46:43.578 RegionMonitoring[188:5314] didExitRegion
2015-01-13 09:46:43.579 RegionMonitoring[188:5314] StopRangingBeacons
2015-01-13 09:46:43.581 RegionMonitoring[188:5314] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000

然后，我打开信标，但没有任何反应。

如果我尝试使用这段代码:

- (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region {
    NSLog(@"didExitRegion");
    //[_locationManager stopRangingBeaconsInRegion:(CLBeaconRegion*)region];
    //NSLog(@"StopRangingBeacons");
}

工作正常:

2015-01-13 10:15:45.945 RegionMonitoring[364:11017] didEnterRegion
2015-01-13 10:15:45.947 RegionMonitoring[364:11017] StartRangingBeacons
2015-01-13 10:15:46.960 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.040842
2015-01-13 10:15:47.960 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.040842
2015-01-13 10:15:48.961 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.040842
2015-01-13 10:15:49.958 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.040842
2015-01-13 10:15:50.960 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 10:15:51.958 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 10:15:52.960 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 10:15:53.956 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 10:15:54.960 RegionMonitoring[364:11017] didExitRegion
2015-01-13 10:15:54.962 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 10:15:55.955 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 10:15:56.960 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 10:15:57.959 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 10:16:02.960 RegionMonitoring[364:11017] didEnterRegion
2015-01-13 10:16:02.962 RegionMonitoring[364:11017] StartRangingBeacons
2015-01-13 10:16:02.963 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.040842
2015-01-13 10:16:02.971 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.040842
2015-01-13 10:16:03.979 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.040842
2015-01-13 10:16:04.979 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.036694
2015-01-13 10:16:05.978 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: 0.036051
2015-01-13 10:16:06.977 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 10:16:07.977 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 10:16:08.974 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 10:16:09.977 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 10:16:10.973 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 10:16:11.977 RegionMonitoring[364:11017] didExitRegion
2015-01-13 10:16:11.978 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 10:16:12.974 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000
2015-01-13 10:16:13.977 RegionMonitoring[364:11017] Ranging Beacon: 77777777-1717-2727-7777-777777777777 and proximity: -1.000000

Answer 1

代码看起来是正确的。我怀疑正在发生的事情是您只是在停止测距后看到新检测的延迟。如果您等待 15 分钟，您会看到第二次区域进入事件吗？

在前台进行测距绝对可以加快信标检测速度，因为它告诉操作系统进行持续的蓝牙扫描以寻找信标。测距导致检测在几秒钟内发生。如果没有测距，iOS 使用 15 分钟的扫描周期来寻找信标，这可能会被 iPhone 5+ 上的蓝牙硬件过滤器加速。硬件过滤器并非 100% 可靠，因此检测有时会延迟最多 15 分钟。

详情请看这里: http://developer.radiusnetworks.com/2013/11/13/ibeacon-monitoring-in-the-background-and-foreground.html