Dismissing UIImagePickerController from UITabBarController

I have a tab bar application whereby one tab uses a navigation controller to move through a series of views. On the final view, there is a button to add a photo, which presents a UIImagePickerController. So far, so good - however when I finish picking the image, or cancel the operation, the previous view is loaded, but without the tab bar. I'm sure I'm missing something elementary, but any suggesti开发者_JAVA百科ons on how to properly release the UIImagePickerController would be much appreciated. The code is as follows:

ImagePickerViewController *aController = [[ImagePickerViewController alloc];             initWithNibName:@"ImagePickerViewController" bundle:[NSBundle mainBundle]];  
[self presentModalViewController:aController animated:YES];  
[aController release];  

//viewDidLoad
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.delegate = self;

if([UIImagePickerController isSourceTypeAvailable:  UIImagePickerControllerSourceTypeCamera]){
      imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
 } else {
      imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;  
 }

 [window addSubview:imagePickerController.view];

//ImagePickerViewController imagePickerControllerDidCancel - FinalViewController is the last view in the stack controlled by a navigation controller which contains the button to present the UIImagePickerController

[picker dismissModalViewControllerAnimated:YES];
FinalViewController *aController = [[FinalViewController alloc initWithNibName:@"FinalViewController" bundle:[NSBundle mainBundle]];
[picker presentModalViewController:aController animated:YES];
[aController release];

You do not need to add the picker view as a subview of the window. When the user presses the button, execute something similar to the following snapPicture method:

- (IBAction) snapPicture{


            UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
            // Set up the source 
            if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
                ipc.sourceType = UIImagePickerControllerSourceTypeCamera; 
                ipc.allowsEditing = NO;
            }
            else {
                    ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;  
                 }

            ipc.delegate = self;
            [self presentModalViewController:ipc animated:YES]; 
            [ipc release];


}

Then, implements the picker delegate methods. here I am just presenting one of them to show how to dismiss the picker.

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)imagePicker 
{ 

    [[imagePicker parentViewController] dismissModalViewControllerAnimated:YES]; 

}