Show or dismiss a specific ViewController after performing an action - objective-c

Question

I want to show a specific ViewController (or dismiss) a View after performing an IBAction in my iPhone App. I've tried
[self.parentViewController.parentViewController dismissModalViewControllerAnimated:YES];
However this does not appear to do anything once the action has been performed.
A bit more information:
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];
if (selectedCell.tag == 1)
{
UIActionSheet *actionSheet = [[UIActionSheet alloc]
initWithTitle:#"Are you sure you want to delete this project?"
delegate:self cancelButtonTitle:#"No" destructiveButtonTitle:#"Yes, I’m Sure" otherButtonTitles:nil];
[actionSheet showInView:self.view];
}
}
- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex
{
if (buttonIndex != [actionSheet cancelButtonIndex])
{
[self.tableView beginUpdates]; // Avoid NSInternalInconsistencyException
// Delete the project object that was swiped
Project *projectToDelete = self.project;
NSLog(#"Deleting (%#)", projectToDelete.name);
[self.managedObjectContext deleteObject:projectToDelete];
[self.managedObjectContext save:nil];
}
}
I want the current view to disappear when a user presses the Yes button on the actionsheet.

Answer 1

// Assume we are inside a UIViewController (or a subclass)
DestinationController *destinationController = [[DestinationController alloc] init];
[self presentModalViewController:destinationController animated:YES];
...
// Assume we are now in destination controller
// Dismiss
[self dismissModalViewControllerAnimated:YES];

Answer 2

I needed to go all the way back to the first (or, root) view in my navigation stack.
All I need to do was use this method:
[controller.navigationController popToRootViewControllerAnimated:YES];

Answer 3

Another way to show and dismiss a view controller is with pushViewController and popViewController.
To show a viewController:
-(void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated;
// Uses a horizontal slide transition. Has no effect if the view controller is already in the stack.
And to dismiss:
-(UIViewController *)popViewControllerAnimated:(BOOL)animated; // Returns the popped controller.