iOS 8.2 CoreBluetooth - CentralManager not calling delegate didDiscoverPeripherals

Question

Since upgrading to iOS 8.2 I seem to be having trouble with CoreBluetooth. I had a previous application working that ran a CBCentralManager subclass to scan for UUIDs I wanted. Now, I'm unable to get a delegate callback to didDiscoverPeripherals .

I've verified that the peripherals are broadcasting correctly via LightBlue. I've verified that the CentralManager state is powered on before calling scan. I tried scanning both with my UUID and also with nil. Again, I had this code working for weeks before upgrading. Has anyone else experienced this or have any idea what could be going on?

EDIT - added code CBCentralManager subclass code

@implementation CentralManager

-(id) initWithDelegate:(id<CBCentralManagerDelegate>)delegate queue:(dispatch_queue_t)queue {
    self = [super initWithDelegate:delegate
                             queue:queue
                           options:nil];
    _items = [NSMutableDictionary new];
    _discoveredPeripherals = [NSMutableArray new];
    _app = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    return self;
}

-(void) startScan {
    if (!_isScanning && self.state == CBCentralManagerStatePoweredOn && _app.loggedIn) {
        [self scanForPeripheralsWithServices:@[[CBUUID UUIDWithString:APP_SERVICE_UUID]] options:nil];
        _isScanning = YES;
        NSLog(@"Scanning started");
    }
}

-(void) stopScan {
    [super stopScan];
    _isScanning = NO;
    NSLog(@"Scanning stopped");
}

In AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
if (!_centralManager) {
    _centralQueue = dispatch_queue_create("centralQueue", nil);
    _centralManager = [[CentralManager alloc]initWithDelegate:self queue:_centralQueue];
}
    [_peripheralManager beginAdvertising];
    [_centralManager startScan];
}

- (void)centralManagerDidUpdateState:(CBCentralManager *)central {
    if (central.state == CBCentralManagerStatePoweredOn) {
        [_centralManager startScan];
    }
}

startScan is called twice depending on if user is logged in or centralManager is powered on first. I basically treat peripheralManager identically and that works (verified by Light Blue).

Answer 1

It looks like the issue has to do with subclassing CBCentralManager . Maybe because of these recent changes in iOS 8.2, because it worked fine before. A quick fix is to add an ivar manager in the subclass and initialize a CBCentralManager . Then call scan on that manager. While this is probably not a clean approach, it highlights the issue.