为什么信标会导致蓝牙不断切换？

Question

我在使用iOS和iBeacon时遇到了一个非常奇怪的错误.我有一个非常简单的BeaconManager范围信标,具有特定的UUID,主要和次要值,并在找到它们后执行一些操作.我的应用似乎正常工作,直到它不断切换蓝牙状态并停止工作.唯一可见的结果是状态栏中的蓝牙图标由于蓝牙停止和重新启动而开始闪烁.

在哪里集中注意力？

这是我的班级定义:

#import "BeaconManager.h"

@implementation BeaconManager

- (instancetype)init {
    self = [super init];
    if (self) {
        NSURL *beep = [[NSBundle mainBundle] URLForResource:@"beep" withExtension:@"aiff"];
        soundFileURLRef = (CFURLRef) CFBridgingRetain(beep);
        AudioServicesCreateSystemSoundID(soundFileURLRef, &soundFileObject);

        // Initializes properties
        beacon = [CLBeacon new];
        foundBeacons = [NSMutableArray new];
        _lastBeaconActionTimes = [[NSMutableDictionary alloc] init];
    }
    return self;
}

- (void)initRegion {
    // Initializes the beacon region by giving it an UUID and an identifier
    NSUUID *uuid = [[NSUUID alloc] initWithUUIDString:BEACON];
    beaconRegion = [[CLBeaconRegion alloc] initWithProximityUUID:uuid identifier:@"beacon.region"];
    // Starts looking for beacon within the region
    [self.locationManager startMonitoringForRegion:beaconRegion];
}

- (void)checkBeacon {
    if (!self.locationManager) {
        self.locationManager = [[CLLocationManager alloc] init];
        self.locationManager.delegate = self;

        if ([self.locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)])
            [self.locationManager requestWhenInUseAuthorization];
    }
    [self initRegion];
    [self locationManager:self.locationManager didStartMonitoringForRegion:beaconRegion];
}

#pragma mark - CLLocationManagerDelegate

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

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

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

- (void)locationManager:(CLLocationManager *)manager monitoringDidFailForRegion:(CLRegion *)region withError:(NSError *)error {
    NSLog(@"Failed monitoring region: %@", error);
}

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
    NSLog(@"Location manager failed: %@", error);
}

- (void)locationManager:(CLLocationManager *)manager
        didRangeBeacons:(NSArray *)beacons
               inRegion:(CLBeaconRegion *)region {

    if (foundBeacons.count == 0) {
        for (CLBeacon *filterBeacon in beacons) {
            // If a beacon is located near the device and its major value is equal to 1000 (MAJOR constant)
            if (((filterBeacon.proximity == CLProximityImmediate) || (filterBeacon.proximity == CLProximityNear)))
                // Registers the beacon to the list of found beacons
                [foundBeacons addObject:filterBeacon];
        }
    }
    // Did some beacon get found?
    if (foundBeacons.count > 0) {
        // Takes first beacon of the list
        beacon = [foundBeacons firstObject];

        if (([beacon.major isEqualToNumber:[NSNumber numberWithInt:MAJOR]]) && ([beacon.minor isEqualToNumber:[NSNumber numberWithInt:MINOR]])) {
            // Takes the actual date and time
            NSDate *now = [[NSDate alloc] init];
            NSString *key = [NSString stringWithFormat:@"%@ %@ %@", [beacon.proximityUUID UUIDString], beacon.major, beacon.minor];
            NSDate *lastBeaconActionTime = [_lastBeaconActionTimes objectForKey:key];
            if ((lastBeaconActionTime == nil) || ([now timeIntervalSinceDate:lastBeaconActionTime] > MINIMUM_ACTION_INTERVAL_SECONDS)) {
                [_lastBeaconActionTimes setObject:now forKey:key];
                // Plays beep sound
                AudioServicesPlaySystemSound(soundFileObject);

                if (self.delegate) {
                    // Performs actions related to the beacon (i.e. delivers a coupon)
                    [self.delegate didFoundBeacon:self];
                }
                self.locationManager = nil;
            }
            // else [self.locationManager stopMonitoringForRegion:region];
        }
        [foundBeacons removeObjectAtIndex:0];
        beacon = nil;
    }
}
@end

Answer 1

不能肯定地说这就是蓝牙不断切换的原因，但这部分绝对是可疑的：

\n\n

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

\n\n

这本质上是一个无限循环。一旦监控开始，iOS 就会调用didStartMonitoring\xe2\x80\xa6 方法，该方法开始监控同一区域，这使得 iOSdidStartMonitoring再次调用该方法，即 \xe2\x80\xa6

\n\n

我首先startMonitoringForRegion从这部分代码中删除该行。

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