iOS5 上的 UIImagePickerController 内存泄漏

我在 iOS5 和 XCode4.2 上开发的应用程序中使用 UIImagePickerController ，出现内存泄漏，我不知道为什么会出现这种泄漏，您能给我答案吗？

和我的代码：

-(void)createImagePicker 
{
_picker = [[UIImagePickerController alloc] init];
_picker.sourceType = UIImagePickerControllerSourceTypeCamera;

_picker.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;

_picker.allowsEditing = YES;
_picker.showsCameraControls = NO;


_picker.cameraDevice = UIImagePickerControllerCameraDeviceRear; 

_picker.delegate = self;
_picker.wantsFullScreenLayout = YES;

}

和 viewWillApper 方法：

    -(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(closeCameraButton:) name:@"ShowMainView" object:nil];
    [self createImagePicker];
    [m_cameraOverlayView setBackgroundColor:[UIColor clearColor]];
    [self presentModalViewController:_picker animated:NO];
    _picker.cameraOverlayView = m_cameraOverlayView;

    [cameraImgView setHidden:YES];
    [filterView setHidden:YES];
    m_cameraOverlayView.hidden = NO;
    cameraSelectedButton.hidden = NO;
    cancelButton.hidden = YES;
    selectButton.hidden = YES;

    for (id Object in [scrollview subviews])
    {
        if([Object isKindOfClass:[UIButton class]])
        {
            [Object removeFromSuperview];
        }
    }

    [m_toolbarImage setFrame:CGRectMake(0, 427, 320, 55)];
    [cameraSelectedButton setFrame:CGRectMake(128, 432, 86, 44)];

    [m_cancelButton setFrame:CGRectMake(10, 434, 82, 40)];
    [m_cancelButton setTitle:@"Close" forState:UIControlStateNormal];
    [m_cancelButton setBackgroundImage:[UIImage imageNamed:@"menu-bar-button.png"] forState:UIControlStateNormal];
    [m_cancelButton setTitleColor:[UIColor colorWithRed:110/256.0 green:52/256.0 blue:28/256.0 alpha:1.0] forState:UIControlStateNormal];


    [cancelButton setFrame:CGRectMake(120, 434, 35, 35)];
    [selectButton setFrame:CGRectMake(184, 434, 35, 35)];

    }

无论是否使用 ARC，这似乎都是 iOS 5 中 UIImagePickerController 的问题。

我有一个使用 xcode 3.2.5 为 iOS 4 开发的应用程序，当拍摄照片或从库中选择照片时，Instruments 没有显示任何泄漏（在运行 iOS 4.1 的设备上测试）。在运行 iOS 5.1 的设备上测试的相同代码会发生泄漏，如上所述。

我知道这不是答案，但问题似乎比原来的问题更广泛。