屏幕关闭时发生的iBeacon事件

Question

我试图触发一个基于iBeacons的事件

当应用程序运行在前台、背景而不是挂起时，它工作得很好(屏幕用电源按钮关闭)。

我可以在锁定屏幕上看到NSLog消息，但当设备屏幕关闭时就看不到了。

有办法这样做吗？

附件代表：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    NSLog(@"applicationDidFinishLaunching");

    _locationManager = [[CLLocationManager alloc] init];
    _locationManager.delegate = self;

    [_locationManager requestAlwaysAuthorization];

    CLBeaconRegion *region;

    region = [[CLBeaconRegion alloc] initWithProximityUUID:[[NSUUID alloc] initWithUUIDString:@"EBEFD083-70A2-47C8-9837-E7B5634DF524"] major: 9 minor: 103 identifier: @"region1"];
    region.notifyEntryStateOnDisplay = YES;
    region.notifyOnEntry = YES;
    region.notifyOnExit = YES;
    [_locationManager startMonitoringForRegion:region];
    [_locationManager startRangingBeaconsInRegion:region];

    return YES;
}

- (void)locationManager:(CLLocationManager *)manager didDetermineState:(CLRegionState)state forRegion:(CLRegion *)region
{
    if(state == CLRegionStateInside) {
        NSLog(@"locationManager didDetermineState INSIDE for %@", region.identifier);
    }
    else if(state == CLRegionStateOutside) {
        NSLog(@"locationManager didDetermineState OUTSIDE for %@", region.identifier);
    }
    else {
        NSLog(@"locationManager didDetermineState OTHER for %@", region.identifier);
    }
}

- (void)locationManager:(CLLocationManager *)manager didRangeBeacons:(NSArray *)beacons inRegion:(CLBeaconRegion *)region
{
    if ( beacons.count > 0 )
    {
        NSLog(@"locationManager didRangeBeacons: %@",beacons.description);
    }
}

Info.plist (仅适用于相关部分)：

        <key>NSLocationAlwaysUsageDescription</key>
        <string>app location requested</string>
        <key>UIBackgroundModes</key>
        <array>
            <string>location</string>
            <string>voip</string>
            <string>bluetooth-peripheral</string>
            <string>bluetooth-central</string>
            <string>external-accessory</string>
        </array>

Answer 1

将pausesLocationUpdatesAutomatically属性LocationManager设置为" NO "，此属性设置为无位置服务永远不会关闭。但是您必须小心，因为将此属性设置为NO会显著增加设备的功耗。

Answer 2

信标监视(didEnterRegion:和didExitRegion:)工作在后台，而信标测距只在应用程序位于前台时才能工作，并且在后台有有限的时间。这些背景限制包括应用程序因事件而被唤醒后的5秒钟(比如由于设置region.notifyEntryStateOnDisplay = YES;而启动的锁定屏幕)。

有一些技巧，你可以做，以获得额外的背景测距时间。请在此阅读：

http://developer.radiusnetworks.com/2014/11/13/extending-background-ranging-on-ios.html