iOS - Programmatically Set A UIContainerView's Embedded UIViewController

3
votes

I have a UIViewController with a UIContainerView inside. Based on whether a certain condition is true, I'd like to programmatically set the container view's embedded view to a different UIViewController. I noticed that you can have only one embed segue to set one UIViewController, so is there a way to get this done?

I tried setting my container view as an outlet, but I could not find any methods that set an embedded UIViewController. Any advice on how to get started with this would be appreciated.

2
iosobjective-cxcodeuiviewcontrolleruicontainerview
What do you really want to achieve? - Hermann Klecker
Don't mix Storyboard and programmatic settings. Do one at a time. There is nothing wrong with mixing both but you risk getting confused until you fully understood how the storyboard really works. - Hermann Klecker
You may want to overwrite - prepareForSegue:sender: to manage different segues based on 3rd conditions. Or don't segue but navigate to the new view controller programmatically or invoke a specific segue from the story board with - performSegueWithIdentifier:sender: - Hermann Klecker

2 Answers

7
votes

I think your idea is wrong if you meant swapping UIViews of UIViewController (hope I understood your conception).

A UIViewController should have 1 designed UIView and should manage the values of that view. As you said, you can use Containers, however you should add then UIViewController with it's view, so there is an instance which manages this view. Your first UIViewController should only add/remove that ChildViewController.

So I'd advise:

Implement a category on UIViewController and add following methods:

- (void)displayContentController:(UIViewController *)content {
    [self addChildViewController:content];
    content.view.frame = [[UIScreen mainScreen] bounds];
    [self.view addSubview:content.view];
    [content didMoveToParentViewController:self];
}

- (void)hideContentController:(UIViewController *)content {
    [content willMoveToParentViewController:nil];
    [content.view removeFromSuperview];
    [content removeFromParentViewController];
}

Create AViewController and BViewController. In AViewController call (viewDidLoad?):

BViewController *bViewController = [[BViewController alloc] init];
[self displayContentController:bViewController];

In BViewController manage the view of this controller. AViewController should only manage when to show BViewController and when to hide it.

If I misunderstood your question please comment it, I'll delete this answer.

0
votes

Inspired by Vive's answer:

extension UIViewController {

    func showContentController(_ controller: UIViewController, containerView: UIView? = nil) {
        controller.willMove(toParentViewController: self)
        self.addChildViewController(controller)
        controller.view.frame = (containerView ?? self.view).frame
        (containerView ?? self.view).addSubview(controller.view)
        controller.view.autoPinEdgesToSuperviewEdges()
        controller.didMove(toParentViewController: self)
    }

    func hideContentController(_ controller: UIViewController) {
        controller.willMove(toParentViewController: nil)
        controller.removeFromParentViewController()
        controller.view.removeFromSuperview()
        controller.didMove(toParentViewController: nil)
    }
}