蓝牙耳机连接检测 - iOS

一.蓝牙音频协议常见的分为两种

1.单向高保真类型音频协议(即:输出),其常见类型为 BluetoothA2DPOutput,听歌看影音为主;
2.双向低保真类型音频协议(即:输出、输入),其常见类型为 BluetoothHFP (即:Hands-Free Profile) 和 BluetoothHSP (HeadSet Profile),听说均可;

二.获取状态

1.蓝牙开启未连接耳机 - Speaker
2.单向高保真音频协议(输出) - BluetoothA2DPOutput
3.双向低保真音频协议(输出、输入) - BluetoothHFP、BluetoothHSP

三.方法实现

1.获取连接状态

#pragma mark - ****************************** 蓝牙耳机是否链接 - 状态
+ (BOOL)isBluetoothHeadsetConnectedState {
    AVAudioSession *session = [AVAudioSession sharedInstance];
    AVAudioSessionRouteDescription *routeDescription = [session currentRoute];
    if (routeDescription) {
        NSArray *outputs = [routeDescription outputs];
        if (outputs && 0 < [outputs count]) {
            AVAudioSessionPortDescription *portDescription = [outputs objectAtIndex:0];
            NSString *portType = [portDescription portType];
            if (portType && [portType isEqualToString:@"BluetoothA2DPOutput"] && [portType isEqualToString:@"BluetoothHFP"] && [portType isEqualToString:@"BluetoothHSP"]) {
                return YES;
            }
        }
    }
    return NO;
}

2.获取连接实体

#pragma mark - ****************************** 蓝牙耳机是否链接 - 实体
+ (AVAudioSessionPortDescription *)isBluetoothHeadsetConnectedEntity {
    /*
     蓝牙开启未链接耳机:
     Speaker
     
     单向保真音频协议(输出):
     BluetoothA2DPOutput
     ...
     
     双向保真音频协议(输入 & 输入):
     BluetoothHFP - HFP(Hands-Free Profile)
     BluetoothHSP - HSP(HeadSet Profile)
     
     其它:
     Receiver
     */
    AVAudioSession *session = [AVAudioSession sharedInstance];
    AVAudioSessionRouteDescription *routeDescription = [session currentRoute];
//    NSLog(@"%@", routeDescription);
    if (routeDescription) {
        NSArray *outputs = [routeDescription outputs]; // 输入源
        if (outputs && 0 < [outputs count]) {
            AVAudioSessionPortDescription *portDescription = [outputs objectAtIndex:0];
            NSString *portType = [portDescription portType];
            NSLog(@"PortType: %@", portType); // 蓝牙开启未链接: Speaker && 链接耳机: BluetoothA2DPOutput BluetoothHFP BluetoothHSP
            if (portType && [portType isEqualToString:@"BluetoothA2DPOutput"]) {
                NSLog(@"[蓝牙检测] - 状态 - 输出 - %@", [portDescription portName]);
                return  portDescription;
            } else if (portType && [portType isEqualToString:@"BluetoothHFP"] && [portType isEqualToString:@"BluetoothHSP"]) {
                NSLog(@"[蓝牙检测] - 状态 - 输出 & 输入 - %@", [portDescription portName]);
                return portDescription;
            }
        }
    }
    return nil;
}

CoreBluetooth 蓝牙切换状态实时检测

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