//导入上面2个框架#import <AVFoundation/AVFoundation.h>#import <CoreFoundation/CoreFoundation.h>//声明下面4个属性@property (nonatomic ,assign)BOOL recording;   //判断是否可以录制@property (nonatomic ,strong)NSString *fileName; //音频文件存储时的文件名@property (nonatomic ,strong)AVAudioRecorder *recorder;  //声明一个录制器@property (nonatomic ,strong)AVAudioPlayer *player;   //声明一个音频播放器- (void)startRecording{if (self.recording) {        return;    }    self.recording =YES;//    设置录音格式  AVFormatIDKey==kAudioFormatLinearPCM//    设置录音采样率(Hz) 如：AVSampleRateKey==8000/44100/96000（影响音频的质量）//    录音通道数  1 或 2   AVNumberOfChannelsKey//    线性采样位数  8、16、24、32   AVLinearPCMBitDepthKey//     录音的质量   AVEncoderAudioQualityKey == AVAudioQualityHigh//    AVLinearPCMIsBigEndianKey 大端还是小端,是内存的组织方式//    AVLinearPCMIsFloatKey  采样信号是整数还是浮点数    NSDictionary *audioSettingDict =[NSDictionary dictionaryWithObjectsAndKeys:                            [NSNumber numberWithFloat:8000],AVSampleRateKey,                            [NSNumber numberWithInt:kAudioFormatLinearPCM],                                AVFormatIDKey,                            [NSNumber numberWithInt:1],AVNumberOfChannelsKey,                            [NSNumber numberWithInt:16],AVLinearPCMBitDepthKey,                            [NSNumber numberWithBool:NO],AVLinearPCMIsBigEndianKey,                            [NSNumber numberWithBool:NO],AVLinearPCMIsFloatKey,                            [NSNumber numberWithInt:AVAudioQualityHigh],AVEncoderAudioQualityKey,                            nil];    NSError *error =nil;    AVAudioSession * audioSession = [AVAudioSession sharedInstance];    [audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&error];//设置音频类别，这里表示当应用启动，停掉后台其他音频        [audioSession setActive:YES error:&error];//设置当前应用音频活跃性         NSDate *now =[NSDate date];    //实例化一个NSDateFormatter对象    NSDateFormatter *dateFormater = [[NSDateFormatter alloc] init];    //设定时间格式,这里可以设置成自己需要的格式    [dateFormater setDateFormat:@"yyyy-MM-dd HH-mm-ss"];        NSString *fileName = [NSString stringWithFormat:@"rec_%@.wav",[dateFormater stringFromDate:now]];    self.fileName =fileName;    NSString *filePath =[NSString documentPathWith:fileName];    NSURL *fileUrl =[NSURL URLWithString:filePath];    //   初始化录制的类    self.recorder =[[AVAudioRecorder alloc]initWithURL:fileUrl settings:audioSettingDict error:&error];        [self.recorder prepareToRecord];    [self.recorder peakPowerForChannel:0];    [self.recorder setMeteringEnabled:YES];    [self.recorder record];}