AVAudioRecorder memory leaks

I'm developing an iPhone 3.1.3 app.

I have the following code in viewDidLoad method:

NSURL *url = [NSURL fileURLWithPath:@"/dev/null"];

NSDictionary *settings = [NSDictionary dictionaryWithObjectsAndKeys:
                          [NSNumber numberWithFloat: 44100.0],                 AVSampleRateKey,
                          [NSNumber numberWithInt: kAudioFormatAppleLossless], AVFormatIDKey,
                          [NSNumber numberWithInt: 2],                         AVNumberOfChannelsKey,
                          [NSNumber numberWithInt: AVAudioQualityMax],         AVEncoderAudioQualityKey,
                          nil];

NSError *error;

if (recorder == nil)
    recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&error];

if (recorder) {
    [recorder prepareToRecord];
    recorder.meteringEnabled = YES;
    [recorder record];

    levelTimer = [NSTimer scheduledTimerWithTimeInterval: 0.03 
                                                  target: self
                                                selector: @selector(levelTimerCallback:)
                                                userInfo: nil 
                                                 repeats: YES];

Note: I check if recorder has been created before create a new one with this code in viewDidLoad:

if (recorder == nil)
        recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&error];

When I move from this ViewController to another ViewController I do this:

[levelTimer invalidate];
levelTimer = nil;
[recorder pause];

And finally, I release recorder on dealloc:

- (void)dealloc {
    if (recorder != nil) {
        [recorder release];
        }
}

Running it with Xcode option 'Run with Performance Tool', looking for Leaks, I开发者_Go百科'm getting leaks with AVAudioRecorder.

The program will go from this first ViewController to a second ViewController. And then, when user wants, it will go from second ViewController to first ViewController and it will run first code I've added.

Is there a memory problem? Do you know a better way to do that? I want avoid been recording while user is in second viewController.

---

Where are you releasing recorder. If you're releasing it in the dealloc method, or not releasing it at all, you may have a leak, assuming the code you've pasted above is triggered in viewDidLoad or similar. recorder will get a new AVAudioRecorder assigned to it every time the view reloads, but will only be released once (when the view controller is dealloc'd).