紅外感應(yīng)

今天項目需求,當(dāng)你播放音頻的時候,
靠近耳朵的時候,需要把 揚(yáng)聲器(外放) 轉(zhuǎn)為 話筒(內(nèi)放)
離開耳朵的時候,需要把 話筒(內(nèi)放) 轉(zhuǎn)為 揚(yáng)聲器(外放)
就跟你打電話的時候,聽筒和揚(yáng)聲器的轉(zhuǎn)換一樣!

//監(jiān)聽 聽筒模式or揚(yáng)聲器模式
//監(jiān)聽是否靠近耳朵
#pragma mark -  開啟紅外感應(yīng)   YES開啟   NO關(guān)閉
    [[UIDevice currentDevice] setProximityMonitoringEnabled:YES]; 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(sensorStateChange:) name:@"UIDeviceProximityStateDidChangeNotification" object:nil];

#pragma mark - 監(jiān)聽是否靠近耳朵
-(void)sensorStateChange:(NSNotificationCenter *)notification;
{
    AVAudioSession *session = [AVAudioSession sharedInstance];
    NSError *sessionError;
    if ([[UIDevice currentDevice] proximityState] == YES)
    {
        //靠近耳朵
        [session setCategory:AVAudioSessionCategoryPlayAndRecord error:&sessionError];
    }
    else
    {
        //遠(yuǎn)離耳朵
        [session setCategory:AVAudioSessionCategoryPlayback error:&sessionError];
    }
}