Adding child ViewControllers as attributes.

HomeViewController.swift

import UIKit

class HomeViewController: UIViewController {

    @IBOutlet weak var containerView: UIView!
    
    private let checkInController: CheckInViewController
    private let checkOutController: CheckOutViewController
    
    init(){
        self.checkInController = CheckInViewController()
        self.checkOutController = CheckOutViewController()
        super.init(nibName: nil, bundle: nil)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()

    }
    
    @IBAction func tappedCheckIn(_ sender: Any){
        
    }
    
    @IBAction func tappedCheckOut(_ sender: Any){
        
    }
}