NSURL *recordedFile;//存放路径

AVAudioPlayer *player;//播放

AVAudioRecorder *recorder;//录制

NSString *recoderName;//文件名

NSDateFormatter *formater = [[NSDateFormatter alloc] init];

[formater setDateFormat:@"yyyy-MM-dd-HH:mm:ss"];

NSString * dateStr = [formater stringFromDate:[NSDate date]];

NSString * path = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, true) lastObject] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.aac",dateStr]];

recoderName = [NSString stringWithFormat:@"%@.aac",dateStr];

recordedFile = [NSURL fileURLWithPath:path];

AVAudioSession *session = [AVAudioSession sharedInstance];

NSError *sessionError;

[session setCategory:AVAudioSessionCategoryPlayAndRecord error:&sessionError];

if(session == nil)

{

}

else

{

    [session setActive:YES error:nil];

}

NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc]init];

//设置录音格式

[recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];

//设置录音采样率

[recordSetting setValue:[NSNumber numberWithFloat:] forKey:AVSampleRateKey];

//录音的质量

[recordSetting setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey];

//线性采样位数  8、16、24、32

[recordSetting setValue:[NSNumber numberWithInt:] forKey:AVLinearPCMBitDepthKey];

//录音通道数  1 或 2

[recordSetting setValue:[NSNumber numberWithInt:] forKey:AVNumberOfChannelsKey];

recorder = [[AVAudioRecorder alloc] initWithURL:recordedFile settings:recordSetting error:nil];

//缓冲录音

[recorder prepareToRecord];

//开始录音

[recorder record];

//如果是反复录制需要置空

player = nil;

//停止录制

[recorder stop];

recorder = nil;

NSError *playerError;

player = [[AVAudioPlayer alloc] initWithContentsOfURL:recordedFile error:&playerError];

//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];

//默认情况下扬声器播放

[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];

[audioSession setActive:YES error:nil];

//建议播放之前设置yes，播放结束设置no，这个功能是开启红外感应

[[UIDevice currentDevice] setProximityMonitoringEnabled:YES];

//添加监听

[[NSNotificationCenter defaultCenter] addObserver:self

                                               selector:@selector(sensorStateChange:)

                                                   name:@"UIDeviceProximityStateDidChangeNotification"

                                                 object:nil];

//开始播放

[_myPlayer play];

-(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)

  {

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

  }

  else

  {

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

  }

}

//关闭红外感应

[[UIDevice currentDevice] setProximityMonitoringEnabled:NO];

//暂停播放

[_myPlayer stop];