Bare bones swift iOS app (without storyboard and scenes)

README.md

1. Create single view swift app

2. Remove storyboard file & clear ""Main Interface" field in App/Tragets configuration

3. Remove Scene delegate and other scene files From Info.plist, remove whole "Application Scene Manifest" entry

AppDelegate.swift

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
	
	var window: UIWindow?

	func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
		window = UIWindow(frame: UIScreen.main.bounds)
		let homeViewController = UIViewController()
		homeViewController.view.backgroundColor = UIColor.red
		window!.rootViewController = homeViewController
		window!.makeKeyAndVisible()
    
		/*
		With navigation controller
		let homeViewController = HomeViewController()
		let navigation = UINavigationController(rootViewController: homeViewController)
		window!.rootViewController = navigation
		window!.makeKeyAndVisible()
		*/
    
		return true
	}

}

HomeVC.swift

// A simple VC code builds UI with plain animation

import UIKit

class HomeViewController: UIViewController {

	override func viewDidLoad() {
		super.viewDidLoad()

		self.navigationController?.isNavigationBarHidden = false
		
		navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Start", style: .plain, target: self, action: #selector(startRecording))

		// Build screen layout
		self.view.backgroundColor = .white
		let btn = UIButton(type:.system)
		btn.backgroundColor = .blue
		btn.setTitle("Button", for: .normal)
		btn.tintColor = .white
		btn.layer.cornerRadius = 5
		btn.frame = CGRect(x: 50, y: 150, width: 100, height: 40)
		UIView.animate(withDuration: 10.0, animations: {
			btn.frame = CGRect(x: 50, y: 700, width: 100, height: 40)
        })
		self.view.addSubview(btn)
		
		/*
		currentAnswer = UITextField()
		currentAnswer.translatesAutoresizingMaskIntoConstraints = false
		currentAnswer.placeholder = "Tap letters to guess"
		currentAnswer.textAlignment = .center
		currentAnswer.font = UIFont.systemFont(ofSize: 44)
		currentAnswer.isUserInteractionEnabled = false
		view.addSubview(currentAnswer)
		*/
		
		/*
		scoreLabel = UILabel()
		scoreLabel.translatesAutoresizingMaskIntoConstraints = false
		scoreLabel.textAlignment = .right
		scoreLabel.text = "Score: 0"
		view.addSubview(scoreLabel)
		*/
	}
}