Accessing child view controllers of a UITabBarController

Question

I am new to iOS, How can I access child view controllers form UITabBarController ? Currently, I have the following.

1. RequestTabBarController
2. ActiveRequestsTableViewController
3. RequestViewController

The child view controllers are connected using a Relationship Segue in the storyboard. I want to set some properties in child views from UITabBarController. How this can be accomplished.

Storyboard

Answer 1

You might define the following enum for mapping your classes:

enum TabType:Int {
    case RequestTabBarController
    case ActiveRequestsTableViewController
    case RequestViewController
}

In such way you can have a clean access to your viewControllers:

An array of the root view controllers displayed by the tab bar interface.

which you can get directly from your UITabBarController, doing so:

private weak var tabVc:UITabBarController?
var niceObject:Whatever?
//...//
override public func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    self.tabVc = segue.destination as? UITabBarController

    if let vc = self.tabVc?.viewControllers?[TabType.RequestTabBarController.rawValue] as? RequestTabBarController {
        vc.doWhatEver(niceObject)
    }
}