在UISplitViewController中解除UIImagePickerController时接收内存警告

Question

我正在使用一个简单的UISplitViewController。在我的主视图（主）中，当用户完成拍摄或点击取消时，我可以使用UIImagePickerController从相机拍摄照片我从控制台收到了内存警告。有谁知道为什么会这样？

以下是我如何呈现控制器：

if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
   cameraService = [[UIImagePickerController alloc] init];     
   cameraService.delegate    = self;
   cameraService.sourceType  = UIImagePickerControllerSourceTypeCamera;

   [self presentViewController:cameraService animated:YES completion:NULL];
}

以下是我关闭图像选择器视图的方法：

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage * image
        = (UIImage *)[info valueForKeyPath:UIImagePickerControllerOriginalImage]];

    [picker dismissViewControllerAnimated:YES completion:nil];
}

谢谢！