View Controller Containment

View Controller Containment

// Adding A Child View Controller
[self addChildViewController:viewController];
viewController.view.frame = self.view.bounds;
[self.view addSubview:viewController.view];
[viewController didMoveToParentViewController:self];

// Removing A Child From A Parent
[viewController willMoveToParentViewController:nil];
[viewController.view removeFromSuperview];
[viewController removeFromParentViewController];

// Replace
// Containment
    [self addChildViewController:vc];
    [self.currentVC willMoveToParentViewController:nil];

    [self transitionFromViewController:self.currentVC
                      toViewController:vc
                              duration:0.25
                               options:0
                            animations:^
    {
        // Do any fancy animation you like


    } completion:^(BOOL finished) {
        [vc didMoveToParentViewController:self];
        [self.currentVC removeFromParentViewController];
        self.currentVC = vc;
    }];