Add childView Extension for reusable

In this article, I would like to show you how to create extension for add your childView.

protocol Containable {
   func add(childView: UIViewController, container: UIView)
   func remove(childView: UIViewController)
}
extension Containable where Self: UIViewController {
   func add(
      childView: UIViewController, 
      container: UIView) {
      addChild(childView)
      container.addSubview(childView.view)
      childView.view.frame = container.bounds
      childView.didMove(toParent: self)
   }
   func remove(childView: UIViewController) {
      childView.willMove(toParent: nil)
      childView.view.removeFromSuperview()
      childView.removeFromParent()
   }
}

How to use it.

class ViewController: UIViewController, Containable {
   @IBOutlet weak var yourView: UIView!
   let yourViewController = YourViewController(nibName: "YourViewController", bundle: nil)
override func viewDidLoad() {
      super.viewDidLoad()
      add(childView: yourViewController, container: yourView)
   }
}