Common extensions for UIViewController.

UITableViewExtensions.swift

//
//  UITableViewExtensions.swift
//
//  Created by Jeff Kereakoglow on 4/22/18.
//  Copyright © 2018 AlexisDigital. All rights reserved.
//

import UIKit.UITableView

extension UITableView {
    func registerNibsWithReuseIdentifierMap(_ reuseIdentifierMap: [String: UITableViewCell.Type]) {
        reuseIdentifierMap.forEach { (reuseIdentifier, cellType) in
            let nib = UINib(nibName: reuseIdentifier, bundle: Bundle(for: cellType))
            self.register(nib, forCellReuseIdentifier: reuseIdentifier)
        }
    }
}

UIViewControllerExtensions.swift

//
//  UIViewControllerExtensions.swift
//
//  Created by Jeff Kereakoglow on 9/4/17.
//  Copyright © 2017 Alexis Digital. All rights reserved.
//

import UIKit.UIViewController

extension UIViewController {
    func addChildViewController(_ childViewController: UIViewController, toView view: UIView) {
        childViewController.willMove(toParentViewController: self)
        addChildViewController(childViewController)
        childViewController.view.frame = view.bounds
        view.addSubview(childViewController.view)
        childViewController.didMove(toParentViewController: self)
    }

    func removeChildViewController(_ childViewController: UIViewController) {
        childViewController.removeFromParentViewController()
        childViewController.view.removeFromSuperview()
    }
}