1 - (IBAction) record:(id)sender  2 {
    3      4     NSError *error = nil;  5     BOOL b = [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryRecord error:&error];  6     [[AVAudioSession sharedInstance] setDelegate:self];  7     if(b){
    8         NSLog(@"set audio session category record victory%d",b);  9     }else {
   10         NSLog(@"error=================%@",error); 11     } 12     b = [[AVAudioSession sharedInstance] setActive:YES error:&error]; 13     if(b){
   14         NSLog(@"set active yes %d",b); 15     }else {
   16         NSLog(@"error=================%@",error); 17     } 18     NSString *filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"voice.caf"]; 19     //NSLog(@"filePath=========================%@",filePath); 20     self.recordFileName = filePath; 21     NSURL *url = [NSURL fileURLWithPath:filePath]; 22     23     AVAudioRecorder *recorder = [[AVAudioRecorder alloc] initWithURL:url settings:recordSettings error:&error]; 24     mRecorder = recorder; 25     [recorder setDelegate:self]; 26     [recorder prepareToRecord]; 27     28     recorder.meteringEnabled = YES; 29     30     BOOL audioHWAvailable = [[AVAudioSession sharedInstance] inputIsAvailable]; 31     32     // start recording 33     [recorder recordForDuration:(NSTimeInterval) 3]; 34 }

播放相对简单：

1 - (IBAction) play:(id)sender  2 {
    3     NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];  4     AVAudioSession *audioSession = [AVAudioSession sharedInstance];  5     [[AVAudioSession sharedInstance] setDelegate:self];  6     NSError *error = nil;  7     BOOL b = [audioSession setCategory:AVAudioSessionCategoryPlayback error:&error];  8 //    if(b){
     9 //        NSLog(@"====================%d",b); 10 //    }else {
    11 //        NSLog(@"error=================%@",error); 12 //    } 13     14     b = [audioSession setActive:YES error:&error]; 15 //    if(b){
    16 //        NSLog(@"====================%d",b); 17 //    }else {
    18 //        NSLog(@"error=================%@",error); 19 //    } 20     21     NSURL *url = [NSURL fileURLWithPath:self.recordFileName]; 22     //NSLog(@"url============================%@",url); 23     AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error]; 24     player.meteringEnabled = YES; 25     player.volume = 1.0; 26     player.delegate = self; 27     [player prepareToPlay]; 28     [player play]; 29     [pool release]; 30 }