ios录音

- (AVAudioRecorder*)audioRecorder {
    if (!audioRecorder) {
        NSString *path = [NSHomeDirectory() stringByAppendingString:@"/tmp"];
        NSTimeInterval timeInterval = [[NSDate date] timeIntervalSince1970];
        NSString *fullName = [path stringByAppendingFormat:@"/%.0f.aif", timeInterval];

        NSMutableDictionary *settings = [NSMutableDictionary dictionary];

        //[settings setValue:[NSNumber numberWithInt: kAudioFormatMPEGLayer3] forKey:AVFormatIDKey];
        [settings setValue:[NSNumber numberWithInt: kAudioFormatLinearPCM] forKey:AVFormatIDKey]; 
        [settings setValue: [NSNumber numberWithFloat:8000] forKey:AVSampleRateKey];
        [settings setValue: [NSNumber numberWithInt: 1] forKey:AVNumberOfChannelsKey]; // mono
        //Linear PCM Format Settings
        [settings setValue:[NSNumber numberWithInt: 8] forKey:AVLinearPCMBitDepthKey];
        [settings setValue:[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
        [settings setValue:[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];

        //Encoder Settings
        [settings setValue:[NSNumber numberWithInt:AVAudioQualityMax] forKey:AVEncoderAudioQualityKey]; //AVAudioQualityMin
        [settings setValue:[NSNumber numberWithInt:96] forKey:AVEncoderBitRateKey];
        [settings setValue:[NSNumber numberWithInt:8] forKey:AVEncoderBitDepthHintKey];

        NSError *error = [NSError new];
        @try {
            audioRecorder = [[AVAudioRecorder alloc] initWithURL:[NSURL fileURLWithPath:fullName] settings:settings error:&error];
        }
        @catch (NSException *exception) {
            [[[[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:@"错误:%@", error.description] message:nil delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil] autorelease] show];
        }
        @finally {
            [error release];
        }


        audioRecorder.delegate = self;
    }

    return audioRecorder;
}

以上方法在真机上,可能会出现调用

[self.audioRecorder record];

时,延迟几秒

加入

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error: nil];

即可