iOS - 设备扬声器听筒切换,静音模式播放音频

//1.一旦有物品靠近手机，离开手机时，都会发出通知。
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(sensorStateChange:) name:UIDeviceProximityStateDidChangeNotification object:nil];

//2.设置静音模式依然播放
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
[audioSession setActive:YES error:nil];

//初始化音频播放器
- (void)initPlayerWithPath:(NSString *)path
{
//创建音乐播放器 , 注意此处player需要强引用一下
self.player = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath:path] error:nil];
self.player.delegate = self;  //设置代理,监听音频播放结束
[self.player prepareToPlay];
}

- (void)play
{
[UIDevice currentDevice].proximityMonitoringEnabled = YES; //播放前开启距离传感器
[self.player play];  //播放
}

- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
[[NSNotificationCenter defaultCenter]removeObserver:self name:UIDeviceProximityStateDidChangeNotification object:nil];  //移除通知
[UIDevice currentDevice].proximityMonitoringEnabled = NO; //关闭距离传感器,节省电
}