UIViewController within UIViewControllers

Question

I have a UIViewController that has UITabBar in it. I am trying to imitate a UITabBarController.

My question is how do I set or a UIViewController whenever a TabBarItem is selected?

I am confused as to how to put a UIViewController inside my UIViewController that is trying to imitate a UITabBarController.

Please don't ask me to use a UITabBarController

so u don't know how to put view inside a view? Make container view with 2 child views in it and that will do the trick ? ... — Kristijan Delivuk, Aug 28 '15 at 12:22
You can use UIContainerView to handle changing between multiple viewControllers — Candost, Aug 28 '15 at 12:23

score 1 · Answer 1 · answered Aug 28 '15 at 12:24

You can use child view controllers to embed view controllers in other view controllers, just call this from your view controller:

YourViewController *childViewController = [[YourViewController alloc] init];

UIView *containerView = //some view in your view hierarchy
childViewController.view.frame = containerView.bounds;

[self addChildViewController: childViewController];
[containerView addSubview:childViewController.view];
[childViewController didMoveToParentViewController:self];

If you want to page between child view controllers, you can use a UIPageViewController as the root child view controller or alternatively borrow this code from the apple documentation:

- (void) cycleFromViewController: (UIViewController*) oldC
        toViewController: (UIViewController*) newC {

[oldC willMoveToParentViewController:nil];                        // 1
[self addChildViewController:newC];

newC.view.frame = [self newViewStartFrame];                       // 2
CGRect endFrame = [self oldViewEndFrame];

[self transitionFromViewController: oldC toViewController: newC   // 3
      duration: 0.25 options:0
      animations:^{
         newC.view.frame = oldC.view.frame;                       // 4
         oldC.view.frame = endFrame;
       }
       completion:^(BOOL finished) {
         [oldC removeFromParentViewController];                   // 5
         [newC didMoveToParentViewController:self];
        }];
}

Thank you. I am using '[containerView addSubview:childViewController.view];' to change the view, is it a bad practice? — JayVDiyk, Aug 29 '15 at 05:01