如何知道最近的iBeacon

我有一个代码可以知道哪个信标是最近的，但是当信标的精度为 -1.00000 时，我遇到一个问题，应用程序采用第二个信标。

因此，有一个小伙子寻找最近的信标，寻找其他信标，并将最近的信标与周围发现的其他信标进行比较。然后，当我知道哪个是最近的一个时，我会向用户显示它的视图，但是当其他信标更接近 ipad 时，视图会关闭并显示视图。

我在两台 iPad 上使用 iOS 7.1 和 7.0.4，第一台是 iPad3，第二台是 iPad Mini Retina。

这里有代码：

    - (void)locationManager:(CLLocationManager *)manager didStartMonitoringForRegion:(CLRegion *)region {
    [self.locationManager startRangingBeaconsInRegion:self.beaconRegion];
}

- (void)initRegion {
    NSUUID *uuid = [[NSUUID alloc] initWithUUIDString:@"00000000-0000-0000-0000-000000000002"];
    self.beaconRegion = [[CLBeaconRegion alloc] initWithProximityUUID:uuid identifier:@"com.devfright.myRegion"];
    [self.locationManager startMonitoringForRegion:self.beaconRegion];
}

- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region {
    NSLog(@"Beacon Found");
    [self.locationManager startRangingBeaconsInRegion:self.beaconRegion];
}

-(void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region {
    NSLog(@"Left Region");
    [self.locationManager stopRangingBeaconsInRegion:self.beaconRegion];
}
-(void)locationManager:(CLLocationManager *)manager didRangeBeacons:(NSArray *)beacons inRegion:(CLBeaconRegion *)region {
    CLBeacon *beacon = [[CLBeacon alloc] init];
    CLBeacon *closestBeacon = [[CLBeacon alloc] init];
    closestBeacon = [beacons lastObject];

    //Search for the closest and show the view
    for (int i=0; i<beacons.count; i++) {
        beacon = beacons[i];
        if (beacon.accuracy < closestBeacon.accuracy && beacon.accuracy != -1.000000 && beacon.minor != closestBeacon.minor && beacon.proximity != CLProximityFar) {
            closestBeacon = beacons[i];
            //NSString *closeAccuracy = closestBeacon.minor.stringValue;
        }
        NSLog(@"\nActualBeacon:%@\nAccuracy:%f", beacon.minor.stringValue,beacon.accuracy);
        NSLog(@"\nCloserBeacon: %@\nAccuracy:%f", closestBeacon.minor.stringValue, closestBeacon.accuracy);

    }
    NSLog(@"\nClosestBeacon: %@", closestBeacon.minor.stringValue);
    if (viewShown == NO) {
        if ([closestBeacon.minor.stringValue  isEqual: @"1"]) {
            actualSection = 1;
            [self immediateDetection];
        }else if ([closestBeacon.minor.stringValue  isEqual: @"2"]){
            actualSection = 2;
            [self immediateDetection];
        }else if ([closestBeacon.minor.stringValue  isEqual: @"3"]){
            actualSection = 3;
            [self immediateDetection];
        }else if ([closestBeacon.minor.stringValue  isEqual: @"4"]){
            actualSection = 4;
            [self immediateDetection];
        }else if ([closestBeacon.minor.stringValue  isEqual: @"5"]){
            actualSection = 5;
            [self immediateDetection];
        }else if ([closestBeacon.minor.stringValue  isEqual: @"6"]){
            actualSection = 6;
            [self immediateDetection];
            NSLog(@"6");
        }else if ([closestBeacon.minor.stringValue  isEqual: @"7"]){
            actualSection = 7;
            [self immediateDetection];
            NSLog(@"7");
        }else if ([closestBeacon.minor.stringValue  isEqual: @"8"]){
            actualSection = 8;
            [self immediateDetection];
            NSLog(@"8");
        }else if ([closestBeacon.minor.stringValue  isEqual: @"9"]){
            actualSection = 9;
            [self immediateDetection];
            NSLog(@"9");
        }else if ([closestBeacon.minor.stringValue  isEqual: @"10"]){
            actualSection = 10;
            [self immediateDetection];
            NSLog(@"10");
        }else if ([closestBeacon.minor.stringValue  isEqual: @"11"]){
            actualSection = 11;
            [self immediateDetection];
            NSLog(@"11");
        }else if ([closestBeacon.minor.stringValue  isEqual: @"30"]){
            actualSection = 30;
            [self immediateDetection];
        }
    } else if (viewShown == YES) {
        if (closestBeacon.minor.integerValue != actualSection) {
            //Alarm: Beacon 11
//            if (closestBeacon.minor.integerValue != 11 || closestBeacon.minor.integerValue != 10) {
                [self dismissViewControllerAnimated:NO completion:nil];
                //actualSection = 0;
                viewShown = NO;
//            }
        }
    }
}
- (void)immediateDetection
{
    viewShown = YES;
    if (self.presentedViewController)
    {
        return;
    }
    if (actualSection == 1) {
        SectionViewController *sectionView = [[SectionViewController alloc] init];
        sectionView.section = 1;
        [self presentViewController:sectionView animated:NO completion:nil];
        sectionView.lbl_name.text = self.lbl_name.text;
    }else if (actualSection == 2){
        SectionViewController *sectionView = [[SectionViewController alloc] init];
        sectionView.section = 2;
        [self presentViewController:sectionView animated:NO completion:nil];
        sectionView.lbl_name.text = self.lbl_name.text;
    }else if (actualSection == 3){
        SectionViewController *sectionView = [[SectionViewController alloc] init];
        sectionView.section = 3;
        [self presentViewController:sectionView animated:NO completion:nil];
        sectionView.lbl_name.text = self.lbl_name.text;
    }else if (actualSection == 4){
        SectionViewController *sectionView = [[SectionViewController alloc] init];
        sectionView.section = 4;
        [self presentViewController:sectionView animated:NO completion:nil];
        sectionView.lbl_name.text = self.lbl_name.text;
    }else if (actualSection == 5){
        SectionViewController *sectionView = [[SectionViewController alloc] init];
        sectionView.section = 5;
        [self presentViewController:sectionView animated:NO completion:nil];
        sectionView.lbl_name.text = self.lbl_name.text;
    }else if (actualSection == 6){
        SectionViewController *sectionView = [[SectionViewController alloc] init];
        sectionView.section = 6;
        [self presentViewController:sectionView animated:NO completion:nil];
        sectionView.lbl_name.text = self.lbl_name.text;
    }else if (actualSection == 7){
        SectionViewController *sectionView = [[SectionViewController alloc] init];
        sectionView.section = 7;
        [self presentViewController:sectionView animated:NO completion:nil];
        sectionView.lbl_name.text = self.lbl_name.text;
    }else if (actualSection == 8){
        SectionViewController *sectionView = [[SectionViewController alloc] init];
        sectionView.section = 8;
        [self presentViewController:sectionView animated:NO completion:nil];
        sectionView.lbl_name.text = self.lbl_name.text;
    }else if (actualSection == 9){
        SectionViewController *sectionView = [[SectionViewController alloc] init];
        sectionView.section = 9;
        [self presentViewController:sectionView animated:NO completion:nil];
        sectionView.lbl_name.text = self.lbl_name.text;
    }else if (actualSection == 10){
        ThiefAlarmViewController *thiefAlarmView = [[ThiefAlarmViewController alloc] init];
        [self presentViewController:thiefAlarmView animated:NO completion:nil];
    }else if (actualSection == 11){
        ThiefAlarmViewController *thiefAlarmView = [[ThiefAlarmViewController alloc] init];
        [self presentViewController:thiefAlarmView animated:NO completion:nil];
    }else if (actualSection == 30){
        SectionViewController *sectionView = [[SectionViewController alloc] init];
        sectionView.section = 30;
        [self presentViewController:sectionView animated:NO completion:nil];
        sectionView.lbl_name.text = self.lbl_name.text;
    }
}

当我知道最接近的 iBeacon 时，我会显示它的视图，但是当它的精度为 -1.00000 并与其他应用程序进行比较时，该应用程序采用第二个，因为第一个的精度 = -1.00000 。

希望任何人都可以帮助我，因为我不知道该怎么办，也许这是一个 iBeacon 问题，但我认为这个问题有一个解决方案。

Thanks.

locationManager:didRangeBeacons:inRegion:将返回您按邻近顺序排列的信标列表。也就是说，列表中的第一个信标将是离您最近的。

然而，这一规则有一个例外：如果任何信标的接近度为“未知”，那么它们将位于列表的顶部（因为它们的精度为 -1）。为了解决这个问题，只需过滤掉任何未知信标，然后选择列表中的第一个：

beacons = [beacons filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"proximity != %d", CLProximityUnknown]];
CLBeacon *nearestBeacon = [beacons firstObject];