iOS录音的基本实现

首先导入头文件

#import <AudioToolbox/AudioToolbox.h>

#import <AVFoundation/AVFoundation.h>

//初始化一个录音控制器 

AVAudioRecorder * recorder;

AVAudioSession* audioSession;

int number;

NSString * urlPlay;

//创建一个录音的按钮，按下按钮开始录音，送开手指录音结束并存在临时文件中

//录音按钮的按下点击事件

- (void)startRecorderButton{

       [self audio];

       //创建录音文件，准备录音

       [recorder prepareToRecord];

       //开始

       [recorder record];

}

//松开手指的事件

- (void)endRecorderButton{

       [recorder stop];

}

- (void)audio{

      audioSession= [AVAudioSessionsharedInstance];

      [audioSessionsetCategory:AVAudioSessionCategoryRecorderror:nil];

      [audioSessionsetActive:YESerror:nil];

      //录音设置

     NSMutableDictionary*recordSetting = [[NSMutableDictionaryalloc]init];

     //设置录音格式

     [recordSettingsetValue:       [NSNumbernumberWithInt:kAudioFormatMPEG4AAC]forKey:AVFormatIDKey];

    //设置录音采样率(Hz)如：AVSampleRateKey==8000/44100/96000（影响音频的质量）

    [recordSettingsetValue:[NSNumbernumberWithFloat:44100]forKey:AVSampleRateKey];  

   //录音通道数1或2

   [recordSettingsetValue:[NSNumbernumberWithInt:1]forKey:AVNumberOfChannelsKey];

   //线性采样位数8、16、24、32

   [recordSettingsetValue:[NSNumbernumberWithInt:16]forKey:AVLinearPCMBitDepthKey];

      //录音的质量

        [recordSettingsetValue:[NSNumbernumberWithInt:AVAudioQualityHigh]forKey:AVEncoderAudioQualityKey];

       NSString*strUrl = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES)lastObject];

        urlPlay= [NSURLfileURLWithPath:[NSStringstringWithFormat:@"%@/%d.aac", strUrl,number++]];  

        NSError*error;

    //初始化

         recorder= [[AVAudioRecorderalloc]initWithURL:urlPlaysettings:recordSettingerror:&error];

    //开启音量检测

        recorder.meteringEnabled=YES;

}