Removing subview hierarchy from root view - ios

Question

In the root view controller I add a subview:
d4sViewController = [[D4sViewController alloc] initWithNibName:#"D4sViewController" bundle:nil];
//----------------------------------------------------------------------
// Move your sub-view off the screen.
//----------------------------------------------------------------------
[self.view addSubview:d4sViewController.view];
CGRect rect = d4sViewController.view.frame;
CGPoint origin = CGPointMake(320, 0);
rect.origin = origin;
d4sViewController.view.frame = rect;
//----------------------------------------------------------------------
// Use a transform to slide it on.
//----------------------------------------------------------------------
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];
d4sViewController.view.transform = CGAffineTransformMakeTranslation(-320, 0);
[UIView commitAnimations];
IN D4sViewController I add 2 subviews:
d4sMainList1ViewController = [[D4sMainList1ViewController alloc] initWithNibName:#"D4sMainList1ViewController" bundle:nil];
// Move your sub-view off the screen.
//----------------------------------------------------------------------
[self.view addSubview:d4sMainList1ViewController.view];
From this subview, d4sMainList1ViewController, I want to give a logout functionality and go back to root view controller by removing all subview.
-(IBAction)buttonLogoutClicked:(id)sender
{
//logout code i need to implement
}
Rootview => d4sViewController => d4sMainList1ViewController (from here i need to remove all subviews of root and go back to displaying just the root view.)

Answer 1

To remove any subview have the send the subview the removeFromSuperView message. See the UIView docs for details.
However, it looks like your stacking views when you don't need to. On a mobile screen a big pile of views is unusable. Look into using UINavigationController to managed a hierarchy of views/viewControllers for you.