iOS监测耳机音量变化、(AirPods蓝牙)耳机插入状态、获取当前音量

开启监听

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
    //监听系统音量
    [self avaVoiceNotificationMethod];
    return YES;
}

音量监听+耳机监听

//音量检测
- (void)avaVoiceNotificationMethod{
    AVAudioSession *session = [AVAudioSession sharedInstance];
    [session setCategory:AVAudioSessionCategoryAmbient error:nil];
    [session setActive:YES error:nil];
    NSError *error;
    [[AVAudioSession sharedInstance] setActive:YES error:&error];
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    //监听系统音量变化
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(volumeChangeNotification:)name:@"AVSystemController_SystemVolumeDidChangeNotification" object:nil];

    //耳机状态获取的通知
    [[NSNotificationCenter defaultCenter]
             addObserver:self
                selector:@selector(audioRouteChangeListenerCallback:)
                    name:AVAudioSessionRouteChangeNotification
                  object:[AVAudioSession sharedInstance]];
}

//音量变化回调
- (void)volumeChangeNotification:(NSNotification *)notifi{
    float volume = [[[notifi userInfo] objectForKey:@"AVSystemController_AudioVolumeNotificationParameter"] floatValue];
    NSLog(@"系统音量:%f", volume);

}

//监听耳机插入拔出状态的改变
- (void)audioRouteChangeListenerCallback:(NSNotification *)notification {
    NSDictionary *interuptionDict = notification.userInfo;
    NSInteger routeChangeReason   = [[interuptionDict
                                      valueForKey:AVAudioSessionRouteChangeReasonKey] integerValue];
    switch (routeChangeReason) {
        case AVAudioSessionRouteChangeReasonNewDeviceAvailable:{//插入耳机

        }
            break;
        case AVAudioSessionRouteChangeReasonOldDeviceUnavailable:{//拔出耳机

        }
            break;
        case AVAudioSessionRouteChangeReasonCategoryChange:
            NSLog(@"AVAudioSessionRouteChangeReasonCategoryChange");
            break;
    }
}

获取当前音量

//获取当前音量
- (CGFloat)getCurrentVoiceMethod{
    AVAudioSession *audioSession = [AVAudioSession sharedInstance];
    CGFloat currentVol = audioSession.outputVolume;
    return currentVol;
}

当前耳机连接状态(包括AirPods等蓝牙音频设备)

//判断是否插入耳机
- (BOOL)hasHeadset{
    AVAudioSession *audioSession = [AVAudioSession sharedInstance];
    AVAudioSessionRouteDescription *currentRoute = [audioSession currentRoute];
    for (AVAudioSessionPortDescription *output in currentRoute.outputs) {
        if ([[output portType] isEqualToString:AVAudioSessionPortHeadphones]||[[output portType] isEqualToString:@"BluetoothA2DPOutput"]) {
            return YES;
        }
    }
    return NO;
}

弹窗提示

//展示弹窗提示
- (void)showVoiceAlertMethod{}
//隐藏弹窗提示
- (void)hideVoiceAlertMethod{}