#import <AVFoundation/AVFoundation.h>  需要引入
 
//獲取document目錄的路徑
[cpp] - (NSString*) documentsPath { 
 if (! _documentsPath) { 
  NSArray *searchPaths = 
   NSSearchPathForDirectoriesInDomains 
   (NSDocumentDirectory, NSUserDomainMask, YES); 
  _documentsPath = [searchPaths objectAtIndex: 0]; 
  [_documentsPath retain]; 
 } 
 return _documentsPath; 
} 
  
//(document目錄的路徑)  
 NSString *destinationString = [[self documentsPath] 
   stringByAppendingPathComponent:filenameField.text]; 
 NSURL *destinationURL = [NSURL fileURLWithPath: destinationString]; 
//初始化AVAudioRecorder  
 NSError *recorderSetupError = nil; 
 AVAudioRecorder audioRecorder = [[AVAudioRecorder alloc] initWithURL:destinationURL 
   settings:recordSettings error:&recorderSetupError]; 
 [recordSettings release]; 
- (NSString*) documentsPath {
 if (! _documentsPath) {
  NSArray *searchPaths =
   NSSearchPathForDirectoriesInDomains
   (NSDocumentDirectory, NSUserDomainMask, YES);
  _documentsPath = [searchPaths objectAtIndex: 0];
  [_documentsPath retain];
 }
 return _documentsPath;
}
 
//(document目錄的路徑)
 NSString *destinationString = [[self documentsPath]
   stringByAppendingPathComponent:filenameField.text];
 NSURL *destinationURL = [NSURL fileURLWithPath: destinationString];
//初始化AVAudioRecorder
 NSError *recorderSetupError = nil;
 AVAudioRecorder audioRecorder = [[AVAudioRecorder alloc] initWithURL:destinationURL
   settings:recordSettings error:&recorderSetupError];
 [recordSettings release];

 
第二個參數  settings是一個容納鍵值對的NSDictionary有四種一般的鍵
1:一般的音頻設置
2:線性PCM設置
3:編碼器設置
4:采樣率轉換設置
 
NSMutableDictionary  需要加入五個設置值(線性PCM)
[java] NSMutableDictionary *recordSettings = 
  [[NSMutableDictionary alloc] initWithCapacity:10]; 
  //1 ID號  
  [recordSettings setObject: 
   [NSNumber numberWithInt: kAudioFormatLinearPCM] forKey: AVFormatIDKey]; 
  float sampleRate = 
   [pcmSettingsViewController.sampleRateField.text floatValue]; 
  //2 采樣率  
  [recordSettings setObject: 
   [NSNumber numberWithFloat:sampleRate] forKey: AVSampleRateKey]; 
    
  //3 通道的數目  
  [recordSettings setObject: 
   [NSNumber numberWithInt: 
    (pcmSettingsViewController.stereoSwitch.on ? 2 : 1)] 
   forKey:AVNumberOfChannelsKey]; 
  int bitDepth = 
   [pcmSettingsViewController.sampleDepthField.text intValue]; 
    
  //4 采樣位數  默認 16  
  [recordSettings setObject: 
   [NSNumber numberWithInt:bitDepth] forKey:AVLinearPCMBitDepthKey]; 
    
  //5  
  [recordSettings setObject: 
   [NSNumber numberWithBool: 
     pcmSettingsViewController.bigEndianSwitch.on] 
    forKey:AVLinearPCMIsBigEndianKey]; 
  
  //6 采樣信號是整數還是浮點數  
  [recordSettings setObject: 
   [NSNumber numberWithBool: 
     pcmSettingsViewController.floatingSamplesSwitch.on] 
    forKey:AVLinearPCMIsFloatKey] 
NSMutableDictionary *recordSettings =
  [[NSMutableDictionary alloc] initWithCapacity:10];
  //1 ID號
  [recordSettings setObject:
   [NSNumber numberWithInt: kAudioFormatLinearPCM] forKey: AVFormatIDKey];
  float sampleRate =
   [pcmSettingsViewController.sampleRateField.text floatValue];
  //2 采樣率
  [recordSettings setObject:
   [NSNumber numberWithFloat:sampleRate] forKey: AVSampleRateKey];
  
  //3 通道的數目
  [recordSettings setObject:
   [NSNumber numberWithInt:
    (pcmSettingsViewController.stereoSwitch.on ? 2 : 1)]
   forKey:AVNumberOfChannelsKey];
  int bitDepth =
   [pcmSettingsViewController.sampleDepthField.text intValue];
  
  //4 采樣位數  默認 16
  [recordSettings setObject:
   [NSNumber numberWithInt:bitDepth] forKey:AVLinearPCMBitDepthKey];
  
  //5
  [recordSettings setObject:
   [NSNumber numberWithBool:
     pcmSettingsViewController.bigEndianSwitch.on]
    forKey:AVLinearPCMIsBigEndianKey];
 
  //6 采樣信號是整數還是浮點數
  [recordSettings setObject:
   [NSNumber numberWithBool:
     pcmSettingsViewController.floatingSamplesSwitch.on]
    forKey:AVLinearPCMIsFloatKey]
;
 
AVAudioRecorder成功創建後,使用他非常直接.它的三個基本方法如下
[java] -(void) startRecording { 
 [audioRecorder record]; 
} 
-(void) pauseRecording { 
 [audioRecorder pause]; 
 recordPauseButton.selected = NO; 
} 
-(void) stopRecording { 
 [audioRecorder stop]; 
} 
-(void) startRecording {
 [audioRecorder record];
}
-(void) pauseRecording {
 [audioRecorder pause];
 recordPauseButton.selected = NO;
}
-(void) stopRecording {
 [audioRecorder stop];
}

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