Child View Controllers

gistfile1.m

- (void)replaceViewController:(UIViewController *)replacementViewController {
    // Load the new view controller
    [self addChildViewController:replacementViewController];
    [replacementViewController.view setFrame:self.view.bounds];
    [self.view addSubview:replacementViewController.view];
    [replacementViewController didMoveToParentViewController:self];
    
    // Get rid of the old one
    [self.selectedViewController willMoveToParentViewController:nil];
    [self.selectedViewController.view removeFromSuperview];
    [self.selectedViewController removeFromParentViewController];
    
    self.selectedViewController = replacementViewController;
}