在 iOS9 中无法检测到 iBeacons。继续获取 CLRegionStateOutside

Question

我买了几个 iBeacons，然后按照教程尝试发现它们 (http://ibeaconmodules.us/blogs/news/14279747-tutorial-ibeacon-app-development-with-corelocation-on-apple-ios-7-8)。

它不起作用。

locationManager:(CLLocationManager *)manager didRangeBeacons 将始终返回一个空数组。

如果我稍微调整一下代码，根据这个问题的回答(locationManager:didEnterRegion not called when a beacon is detected)，我会继续得到 CLRegionStateOutside

需要注意的一点是，我在下载第 3 方应用 Light Blue 时发现了 Beacon 的 UDID。并且 Light Blue 应用程序可以正确识别我所有的信标。

要注意的另一件事是，我不知道应该在标识符字段中输入什么，所以我只是键入了一个粘贴在物理信标之外的字符串。

这是代码：

    - (void) locationManager:(CLLocationManager *)manager didStartMonitoringForRegion:(CLRegion *)region
    {
        NSLog(@"did start monitoring");
        [self.locationManager requestStateForRegion:self.beaconRegion];
    }

    -(void)locationManager:(CLLocationManager *)manager didDetermineState:(CLRegionState)state forRegion:(CLRegion *)region
    {
        if (state == CLRegionStateInside)
        {
            //Start Ranging
            NSLog(@"inside, start ranging");
            [manager startRangingBeaconsInRegion:self.beaconRegion];
        }
        else
        {
            NSLog(@"outside, stop ranging");
            //Stop Ranging here
        }
    }

    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    {
        // Override point for customization after application launch.
        NSUUID *beaconUUID = [[NSUUID alloc] initWithUUIDString:@"9B2D1BB8-25AA-8EE5-2513-7C140B6B1801"];
        NSString *regionIdentifier = @"MiniBeacon_04193";
        CLBeaconRegion *beaconRegion = [[CLBeaconRegion alloc] initWithProximityUUID:beaconUUID
                                                                               major:0 minor:0 identifier:regionIdentifier];
        self.beaconRegion = beaconRegion;
        self.beaconRegion.notifyOnEntry=YES;
        self.beaconRegion.notifyOnExit=YES;
        self.beaconRegion.notifyEntryStateOnDisplay=YES;

        switch ([CLLocationManager authorizationStatus]) {
            case kCLAuthorizationStatusAuthorizedAlways:
                NSLog(@"Authorized Always");
                break;
            case kCLAuthorizationStatusAuthorizedWhenInUse:
                NSLog(@"Authorized when in use");
                break;
            case kCLAuthorizationStatusDenied:
                NSLog(@"Denied");
                break;
            case kCLAuthorizationStatusNotDetermined:
                NSLog(@"Not determined");
                break;
            case kCLAuthorizationStatusRestricted:
                NSLog(@"Restricted");
                break;

            default:
                break;
        }

        self.locationManager = [[CLLocationManager alloc] init];
        if([self.locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) {
            [self.locationManager requestAlwaysAuthorization];
        }
        self.locationManager.delegate = self;
        self.locationManager.pausesLocationUpdatesAutomatically = NO;
        [self.locationManager startMonitoringForRegion:beaconRegion];
        return YES;
    }

    -(void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region {
        [manager startRangingBeaconsInRegion:(CLBeaconRegion*)region];
        [self.locationManager startUpdatingLocation];

        NSLog(@"You entered the region.");
        [self sendLocalNotificationWithMessage:@"You entered the region."];
    }

    -(void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region {
        [manager stopRangingBeaconsInRegion:(CLBeaconRegion*)region];
        [self.locationManager stopUpdatingLocation];

        NSLog(@"You exited the region.");
        [self sendLocalNotificationWithMessage:@"You exited the region."];
    }

    -(void)sendLocalNotificationWithMessage:(NSString*)message {
        UILocalNotification *notification = [[UILocalNotification alloc] init];
        notification.alertBody = message;
        [[UIApplication sharedApplication] scheduleLocalNotification:notification];
    }

    -(void)locationManager:(CLLocationManager *)manager didRangeBeacons:(NSArray *)beacons inRegion:(CLBeaconRegion *)region {
        NSString *message = @"";

        IMViewController *viewController = (IMViewController*)self.window.rootViewController;
        viewController.beacons = beacons;
        [viewController.tableView reloadData];

        if(beacons.count > 0) {
            CLBeacon *nearestBeacon = beacons.firstObject;
            if(nearestBeacon.proximity == self.lastProximity ||
               nearestBeacon.proximity == CLProximityUnknown) {
                return;
            }
            self.lastProximity = nearestBeacon.proximity;

            switch(nearestBeacon.proximity) {
                case CLProximityFar:
                    message = @"You are far away from the beacon";
                    break;
                case CLProximityNear:
                    message = @"You are near the beacon";
                    break;
                case CLProximityImmediate:
                    message = @"You are in the immediate proximity of the beacon";
                    break;
                case CLProximityUnknown:
                    return;
            }
        } else {
            message = @"No beacons are nearby";
        }

        NSLog(@"%@", message);
        [self sendLocalNotificationWithMessage:message];
    }

Answer 1

问题是代码没有寻找信标的正确 ProximityUUID。源自 Light Blue 应用程序的代码中的 9B2D1BB8-25AA-8EE5-2513-7C140B6B1801 UUID 不是检测 iBeacons 所需的 ProximityUUID。

了解 UUID 有很多种。 Light Blue 应用程序将检测蓝牙服务 UUID，但不会检测 iBeacon ProximityUUID。虽然表面上看起来相同，但它们具有不同的价值和含义。您使用浅蓝色扫描的蓝牙服务 UUID 可能确实来自信标，但在显示的代码中仍然无法正常工作，因为它不是正确的 ProximityUUID。

如何确定信标的 ProximityUUID？几个选项：

1. 询问制造商，或使用制造商的配置实用程序。

2. 使用dedicated beacon scanner for Android、OSX 或 Linux，无论 ProximityUUID 如何，您都可以看到任何信标。不幸的是，如果您事先知道 ProximityUUID，iOS 只会让您看到信标。

一旦您知道 ProximityUUID，只需替换该值而不是显示的 9B2D1BB8-25AA-8EE5-2513-7C140B6B1801。