iOS录音和播放

现在的社交应用中录音和播放时必不可少的一部分，当然有些为了互动性更强也会加入一些声音，关于录音的博客网上也是不胜其数，当然效果也是差强人意，要么是到处转载，要么就是下载之后发现不能录音或者不能播放，如果你想做一些些简单的录音和播放，可以参考本文，先来看一下效果图:

FlyElephant.png

录音

AVAudioRecorder是录音必须要用的，其次就是要设置录音的路径，存放在本地，之后的播放或者说上传都通过此路径进行进行操作，简单看一下核心代码:

   NSLog(@"FlyElephant-startRecording");;
   AVAudioSession *audioSession = [AVAudioSession sharedInstance];
   [audioSession setCategory:AVAudioSessionCategoryRecord error:nil];
   
   NSError *error = nil;
   self.audioRecorder = [[ AVAudioRecorder alloc] initWithURL:self.recordUrl settings:[self audioRecordingSettings] error:&error];
   self.audioRecorder.meteringEnabled = YES;
   if ([self.audioRecorder prepareToRecord] == YES){
       self.audioRecorder.meteringEnabled = YES;
       [self.audioRecorder record];
   }else {
       NSLog(@"FlyElephant--初始化录音失败");
   }

录音路径:

   NSArray *dirPaths = NSSearchPathForDirectoriesInDomains(
                                                           NSDocumentDirectory, NSUserDomainMask, YES);
   NSString *docsDir = [dirPaths objectAtIndex:0];
   NSString *soundFilePath = [docsDir
                              stringByAppendingPathComponent:@"recordTest.caf"];
   
   NSURL *url = [NSURL fileURLWithPath:soundFilePath];
   self.recordUrl=url;

录音设置：

- (NSDictionary *)audioRecordingSettings{

   NSDictionary *result = nil;

   NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc]init];
   //设置录音格式  AVFormatIDKey==kAudioFormatLinearPCM
   //    [recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];
   [recordSetting setValue:[NSNumber numberWithInt:kAudioFormatAppleLossless] forKey:AVFormatIDKey];
   //设置录音采样率(Hz) 如：AVSampleRateKey==8000/44100/96000（影响音频的质量）
   [recordSetting setValue:[NSNumber numberWithFloat:44100] forKey:AVSampleRateKey];
   //录音通道数  1 或 2
   [recordSetting setValue:[NSNumber numberWithInt:1] forKey:AVNumberOfChannelsKey];
   //线性采样位数  8、16、24、32
   [recordSetting setValue:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
   //录音的质量
   [recordSetting setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey];

   result = [NSDictionary dictionaryWithDictionary:recordSetting];
   return result;
}

录音播放

AVAudioPlayer是必不可少的，调用起来非常方便，设置循环次数，直接播放即可，当然也可以进行声音设置，根据实际需要个人设置即可:

   NSLog(@"FlyElephant-playRecording");
   AVAudioSession *audioSession = [AVAudioSession sharedInstance];
   [audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
   NSError *error;
   self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:self.recordUrl error:&error];
   self.audioPlayer.numberOfLoops = 0;
   [self.audioPlayer play];
   NSLog(@"FlyElephant-playing");

声音没法展示，看一下Log:

**2016-06-06 14:49:56.304 FEAudioRecord[2341:1257382] FlyElephant-startRecording**
**2016-06-06 14:49:59.838 FEAudioRecord[2341:1257382] stopRecording**
**2016-06-06 14:49:59.873 FEAudioRecord[2341:1257382] stopped**
**2016-06-06 14:50:01.239 FEAudioRecord[2341:1257382] FlyElephant-playRecor**