我的问题是：如何在手机锁定（未打开显示器）或在后台时从中央启用连续监控？
首先，我正在使用由 Christopher Mann @ https://github.com/csmann/iBeaconDemo提供的 iBeaconDemo ，我不认为编写此演示，但我使用它来了解 iBeacon 和区域监控。这是一个很棒的演示，但我希望它启用了后台监控，以便在您进入 Near 范围时显示本地通知。
我在我的 Capabilities (info.plist) 文件中启用了蓝牙中心、蓝牙外设和位置，并将 .notifyOnDisplay、notifyOnEntry 和 notifyOnExit 设置为 YES，并发现当应用程序处于前台或锁定时我得到了结果屏幕（在手机锁定时按主页按钮），但在后台（手机已解锁）或手机已锁定（无显示）时无法对其进行监控。
这是我的 appDelegate 的 didEnterBackground 方法（注意：这是一个不同的本地通知，这个每次都能正常工作，但与我进入该区域时想要显示的通知不同：
- (void)applicationDidEnterBackground:(UIApplication *)application {
NSLog(@"Application entered background state.");
[[UIApplication sharedApplication] cancelAllLocalNotifications];
// create local notification and present it immediately
UILocalNotification *notification = [self createLocalNotification:@"Bring app back to foreground"];
[[UIApplication sharedApplication] presentLocalNotificationNow:notification];
}
以下是我想在后台显示的通知，一旦我进入该区域，我只需要弹出 1 个通知（我在每个中放置 1 个用于测试目的）：
- (void)locationManager:(CLLocationManager *)manager didRangeBeacons:(NSArray *)beacons inRegion:(CLBeaconRegion *)region {
// identify closest beacon in range
if ([beacons count] > 0) {
CLBeacon *closestBeacon = beacons[0];
if (closestBeacon.proximity == CLProximityImmediate) {
/**
Provide proximity based information to user. You may choose to do this repeatedly
or only once depending on the use case. Optionally use major, minor values here to provide beacon-specific content
*/
[self fireUpdateNotificationForStatus:[NSString stringWithFormat:@"Range: %li \n Beacon Name: %@ \n You are in the immediate vicinity of the Beacon.", (long)closestBeacon.rssi, ((CLBeaconRegion*)region).identifier]];
[[UIApplication sharedApplication] presentLocalNotificationNow:[self createLocalNotification:@"Immediate LN"]];
} else if (closestBeacon.proximity == CLProximityNear) {
// detect other nearby beacons
// optionally hide previously displayed proximity based information
[self fireUpdateNotificationForStatus:[NSString stringWithFormat: @"Range: %li \n Beacon Name: %@ \n There are Beacons nearby.", (long)closestBeacon.rssi, ((CLBeaconRegion*)region).identifier]];
[[UIApplication sharedApplication] presentLocalNotificationNow:[self createLocalNotification:@"Near LN"]];
} else if (closestBeacon.proximity == CLProximityFar) {
[self fireUpdateNotificationForStatus:[NSString stringWithFormat:@"Range: %li \n Beacon Name: %@ \n You are far away from the %@th beacon in store %@!", (long)closestBeacon.rssi, ((CLBeaconRegion*)region).identifier, closestBeacon.minor, closestBeacon.major]];
[[UIApplication sharedApplication] presentLocalNotificationNow:[self createLocalNotification:@"Far LN"]];
}
} else {
// no beacons in range - signal may have been lost
// optionally hide previously displayed proximity based information
[self fireUpdateNotificationForStatus:@"There are currently no Beacons within range."];
}
}
最后，这里是 fireUpdateNotificationsForStatus 方法，以防这可能有用：
- (void)fireUpdateNotificationForStatus:(NSString*)status {
// fire notification to update displayed status
[[NSNotificationCenter defaultCenter] postNotificationName:kLocationUpdateNotification
object:Nil
userInfo:@{@"status" : status}];
}
如果还有其他有用的帮助，请随时告诉我。感谢您的时间！