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我正在尝试跟踪是否在 iOS 设备上连接了蓝牙设备。我使用了以下代码：

#import <Foundation/Foundation.h>
#import <CoreBluetooth/CoreBluetooth.h>


@interface scDeviceManager:NSObject <CBCentralManagerDelegate>
@property (nonatomic, strong) CBCentralManager *centralManager;

+ (scDeviceManager *) sharedInstance;

@end

#import "scDeviceManager.h"


@implementation scDeviceManager
@synthesize centralManager = _centralManager;


+ (scDeviceManager *) sharedInstance {

    static scDeviceManager *_sharedInstance=nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _sharedInstance = [[self alloc] init];
    });

    return _sharedInstance;
}

- (id)init {

    if (self = [super init]) { // equivalent to "self does not equal nil"

        _centralManager=[[CBCentralManager alloc] initWithDelegate:self queue:nil];
        //also tried
        //_centralManager=[[CBCentralManager alloc] initWithDelegate:self queue:dispatch_get_main_queue()];

    }
    return self;
}


- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral {

    NSLog(@"Peripheral connected");
}




- (void)centralManagerDidUpdateState:(CBCentralManager *)central{
    _log=[[Logger alloc] initWithClassName:NSStringFromClass([self class])];

    switch (central.state) {
        case CBCentralManagerStatePoweredOff:
            NSLog(@"CoreBluetooth BLE hardware is powered off.");

            break;
        case CBCentralManagerStatePoweredOn:
            NSLog(@"CoreBluetooth BLE hardware is powered on and ready.");
            [_centralManager scanForPeripheralsWithServices:nil options:nil];
            break;
        case CBCentralManagerStateResetting:
            NSLog(@"CoreBluetooth BLE hardware is resetting.");
            break;
        case CBCentralManagerStateUnauthorized:
            NSLog(@"CoreBluetooth BLE state is unauthorized.");
            break;
        case CBCentralManagerStateUnknown:
            NSLog(@"CoreBluetooth BLE state is unknown.");
            break;
        case CBCentralManagerStateUnsupported:
            NSLog(@"CoreBluetooth BLE hardware is unsupported on this platform.");
            break;
        default:
            NSLog([NSString stringWithFormat:@"Nothing to do: state (%ld).",(long)central.state]);
            break;
    }
}

@end;

在某些时候，我将对象称为 scDeviceManager：

scDeviceManager *deviceManager = [scDeviceManager sharedInstance];

当我从 iOS 激活/停用蓝牙时，我收到以下消息：

2016-04-27 13:33:21.940 CoreBluetooth BLE 硬件已关闭。

2016-04-27 13:33:24.046 CoreBluetooth BLE 硬件已开机并准备就绪。

这表明蓝牙已被激活，并且我正在扫描新的蓝牙设备。

但是，当我连接蓝牙设备（三星 HM1700、蓝牙耳机）时，不会调用 didConnectPeripheral。确保蓝牙设备已连接，因为我可以听音乐。

在自定义 iOS 按钮中，我调用以下函数

-(void) scanConnectedDevices{

    NSArray *inputs = [[AVAudioSession sharedInstance] availableInputs];
    for (AVAudioSessionPortDescription *port in inputs)
    {
        connectedAudioDevices[port.portType]=port;
        NSLog(@"type:%@, name:%@",port.portyType,port.portName)
    }

}

我得到的是：

麦克风内置：iPhone 麦克风

蓝牙HFP：HM1700

这表明设备已连接。但是，每当我连接/断开蓝牙设备时，我希望通过一个代表来执行代码的和平。

谢谢

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1 回答 1

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我可以看到混合起来是多么容易；）

你在做什么：基本上在内存中创建蓝牙实例。然后你通过设置连接另一个蓝牙设备结果：这两件事彼此无关 - >你的“代码”对你从另一个地方连接的耳机一无所知......

如果您试图确定是否连接了另一个蓝牙设备：您可能需要成为 MFI 计划的成员，然后才能连接到您自己制造的耳机。

否则，据我所知，iOS 上无法仅“列出”连接的“经典”蓝牙设备。

于 2016-04-29T09:17:38.927 回答