[[UIDevice currentDevice] setProximityMonitoringEnabled:NO];   //建议在播放之前设置yes，播放结束设置NO，这个功能是

//添加监听

self

@selector(sensorStateChange:)

@"UIDeviceProximityStateDidChangeNotification"

nil];

//处理监听触发事件

void)sensorStateChange:(NSNotificationCenter *)notification;

//如果此时手机靠近面部放在耳朵旁，那么声音将通过听筒输出，并将屏幕变暗（省电啊）

if ([[UIDevice currentDevice] proximityState] == YES)

{

NSLog(@"Device is close to user");

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];

}

else

{

NSLog(@"Device is not close to user");

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];

}

//初始化播放器的时候如下设置

UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback;

sizeof(sessionCategory),

&sessionCategory);

UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;

sizeof (audioRouteOverride),

&audioRouteOverride);

//默认情况下扬声器播放

/**
 *  创建播放器
 *
 *  @return 播放器
 */
-(AVAudioPlayer *)audioPlayer{
//    _audioPlayer=nil;
    if (!_audioPlayer) {
        NSURL *url=[self getSaveAudioPath];
        NSError *error=nil;
        _audioPlayer=[[AVAudioPlayer alloc]initWithContentsOfURL:url error:&error];
        _audioPlayer.numberOfLoops=0;
        _audioPlayer.delegate=self;
        [_audioPlayer prepareToPlay];
        
        //初始化播放器的时候如下设置
        UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback;
        AudioSessionSetProperty(kAudioSessionProperty_AudioCategory,
                                sizeof(sessionCategory),
                                &sessionCategory);
        UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
        AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,
                                 sizeof (audioRouteOverride),
                                 &audioRouteOverride);
        
        AVAudioSession *audioSession = [AVAudioSession sharedInstance];
        [audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
        [audioSession setActive:YES error:nil];
        if (error) {
            NSLog(@"创建播放器过程中发生错误，错误信息：%@",error.localizedDescription);
            return nil;
        }
    }
    return _audioPlayer;
}