iOS前台再次找不到iBeacon

Question

你好~我正在学习使用CLLocationManager检测iBeacon。我读了这篇文章： http://developer.radiusnetworks.com/2013/11/13/ibeacon-monitoring-in-the-background-and-foreground.html 它说 startRangingBeaconsInRegion 将使系统每秒扫描一次信标。我测试是正确的。

但是如果程序只执行startMonitoringForRegion而不执行startRangingBeaconsInRegion，就会出现问题。

我的程序可以在我第一次启动信标硬件时找到信标，并且在我停止信标后调用函数 didExitRegion。但是在我第二次启动信标后，程序根本找不到它（执行didEnterRegion）。我等了1个小时

我用于测试的硬件是 iPhone 5s iOS 8.1.2 和 radBeacon USB。这是我的代码。

#import "ViewController.h"
#import <CoreLocation/CoreLocation.h>

@interface ViewController () <CLLocationManagerDelegate>
@property (retain, nonatomic) IBOutlet UITextView *textView;
@property (strong, nonatomic) NSMutableString *myLog;
@property (strong, nonatomic) CLLocationManager *locationManager;
@property (strong, nonatomic) CLBeaconRegion *beaconRegion;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self startBeaconMonitoring];
}

- (void)startBeaconMonitoring {
    _locationManager = [[CLLocationManager alloc] init];
    _locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
    _locationManager.delegate = self;

    [_locationManager performSelector:@selector(requestAlwaysAuthorization)];

    [self userGeofencingPreferencesWereUpdatedWithNotification:nil];

    [self updateLogWithString:@"start the app"];
}

- (void) userGeofencingPreferencesWereUpdatedWithNotification: (NSNotification *) notification
{
    if (1) {
        NSUUID *proximityUUID = [[NSUUID UUID] initWithUUIDString:@"EEF45689-BBE5-4FB6-9E80-41B78F6578E2"];
        _beaconRegion = [[CLBeaconRegion alloc]
                         initWithProximityUUID:proximityUUID
                         identifier:@"1"];
        _beaconRegion.notifyEntryStateOnDisplay = YES;
        [_locationManager startMonitoringForRegion:_beaconRegion];
        //[_locationManager startRangingBeaconsInRegion:beaconRegion];
        //[_locationManager stopUpdatingLocation];
    }
}

- (void) locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region
{
    [self updateLogWithString:@"enter"];
    NSLog(@"enter");
}

- (void) locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region
{
    [self updateLogWithString:@"exit"];
    NSLog(@"exit");
}

- (void)locationManager:(CLLocationManager *)manager
        didRangeBeacons:(NSArray *)beacons
               inRegion:(CLBeaconRegion *)region {
    //NSLog(@"range");
}

- (void)dealloc {
    [_textView release];
    [_myLog release];
    [_locationManager release];
    [_beaconRegion release];
    [super dealloc];
}

- (NSMutableString *)myLog {
    if (!_myLog) {
        _myLog = [[NSMutableString alloc] init];
    }
    return _myLog;
}

- (void) updateLogWithString:(NSString*)newLog {
    NSDate *now = [NSDate date];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    dateFormatter.dateFormat = @"hh:mm:ss";
    [dateFormatter setTimeZone:[NSTimeZone systemTimeZone]];
    NSString * logWithTime = [NSString stringWithFormat:@"%@---%@\n",[dateFormatter stringFromDate:now], newLog];
    [self.myLog appendString:logWithTime];
    self.textView.text = self.myLog;
    [dateFormatter release];
}
@end

Answer 1

我偶然发现了一些东西，这解决了我的问题。当我使用名为 Broadcaster 的 iOS APP 模拟 iBeacon 时，它会非常快速地触发 iBeacon 检测 APP 运行在另一个 iOS 设备上，无论是前台，后台还是屏幕关闭。当我使用 Rad Beacon USB 时，仍然失败。我测试了我所有的 4 个 Rad Beacon USB，同样的事情发生了。好像Rad Beacon USB发送的BLE消息和iOS模拟的有点不一样（我刚试了APP Broadcaster）。 iOS8 对待他们在某些情况下会有所不同。

我的 Rad Beacon USB 是 2.0 版。

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