CBPeripheralManager没有开机

Question

我一直收到一个错误，说我的CBPeripheralManager没有打开，但是在我的代码中，我觉得我实现了这一点。这是我的代码：

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    // Start up the CBPeripheralManager
    _peripheralManager = [[CBPeripheralManager alloc] initWithDelegate:self queue:nil];
    // Start up the CBCentralManager

    // And somewhere to store the incoming data
    _data = [[NSMutableData alloc] init];
}

/** Required protocol method.  A full app should take care of all the possible states,
 *  but we're just waiting for  to know when the CBPeripheralManager is ready
 */
- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral {

    if (peripheral.state == CBPeripheralManagerStatePoweredOn) {

        // We're in CBPeripheralManagerStatePoweredOn state...
        NSLog(@"self.peripheralManager powered on.");

        // ... so build our service.

        // Then the service
        CBMutableService *transferService = [[CBMutableService alloc] initWithType:[CBUUID UUIDWithString:TRANSFER_SERVICE_UUID] primary:YES];

        // And add it to the peripheral manager
        [self.peripheralManager addService:transferService];
    }
}

然后，我打电话给我的外围设备，用IBAction按钮开始做广告：

- (IBAction)advertise:(id)sender {
    [self.peripheralManager startAdvertising:@{ CBAdvertisementDataServiceUUIDsKey : @[[CBUUID UUIDWithString:TRANSFER_SERVICE_UUID]] }];
    [self.peripheralManager startAdvertising:@{ CBAdvertisementDataTxPowerLevelKey : @(YES)}];
}

Answer 1

为了防止这些警告，您需要将对CBPeripheralManager的所有调用都包装在状态检查中。因为你只是在一个未定的时间打电话给广告，你需要确保你的peripheralManager仍然有动力，并准备好去做。

- (IBAction)advertise:(id)sender
{
  if(self.peripheralManager.state == CBPeripheralManagerStatePoweredOn)
  {
    //Now you can call advertise
  }
}