iOS如何发现蓝牙耳机及其事件

我正在尝试发现“蓝牙耳机”并获取其事件。我读了“核心蓝牙”文档和实现的示例代码如下。它不会触发委托方法'didDiscoverPeripheral'.

有什么解决办法吗？

Code:

CBCentralManager *myCentralManager;
[myCentralManager scanForPeripheralsWithServices:nil options:nil];


-(void)centralManagerDidUpdateState:(CBCentralManager *)central{

    //following line prints CBCentralManagerStatePoweredOn

    NSLog(@"state:%@", [self getCentralManagerState:central.state]);
}


//following method does not fire

-(void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{

}

如前所述，CoreBluetooth 仅适用于 LE 设备，
这就是我所做的蓝牙HFP 的事件设备：
1.需要打开AVAudioSession：
link AVFoundation.framework到你的项目
2. 对于当前可用的输入：

NSArray *availInputs = [[AVAudioSession sharedInstance] availableInputs];

3. 路线变更通知：
A。设置新的AVAudioSession
b.注册观察员AVAudioSessionRouteChangeNotification

- (BOOL)prepareAudioSession {

    // deactivate session
    BOOL success = [[AVAudioSession sharedInstance] setActive:NO error: nil];
    if (!success) {
        NSLog(@"deactivationError");
    }

    // set audio session category AVAudioSessionCategoryPlayAndRecord options AVAudioSessionCategoryOptionAllowBluetooth
    success = [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord withOptions:AVAudioSessionCategoryOptionAllowBluetooth error:nil];
    if (!success) {
        NSLog(@"setCategoryError");
    }

    // activate audio session
    success = [[AVAudioSession sharedInstance] setActive:YES error: nil];
    if (!success) {
        NSLog(@"activationError");
    }

    return success;
}

当你想开始监听变化时调用它：

[self prepareAudioSession];

NSNotificationCenter *defaultCenter = [NSNotificationCenter defaultCenter];
[defaultCenter addObserver:self
                  selector:@selector(bluetoothAvailabilityDidChange:)
                      name:@"BluetoothConnectabilityChangedNotification"
                    object:nil];

4. if you want to get the callbacks while on background, you need to add Audio and AirPlay on target's capabilities:
   

!! This https://stackoverflow.com/a/20898939/1787109得到解决方案时，答案对我有帮助