RootViewControllerIniOS14.swift

//
//  Created by Dan Tavares on 10/07/2020.
//

import SwiftUI

struct WindowKey: EnvironmentKey {
	static let defaultValue: UIWindow? = {
		guard
			let firstScene = UIApplication.shared.connectedScenes.first,
			let windowScene = firstScene as? UIWindowScene
		else {
			return nil
		}
		let window = UIWindow(windowScene: windowScene)
		window.rootViewController = UIViewController()
		return window
	}()
}

extension EnvironmentValues {
	var rootWindow: UIWindow? {
		get {
			return self[WindowKey.self]
		}
		set {
			self[WindowKey.self] = newValue
		}
	}
}

struct MyAwesomeApp: App {
	@Environment(\.rootWindow) private var rootWindow
	var body: some Scene {
		WindowGroup {
			ContentView()
		}		
	}
}

// Make sure you call
// rootWindow?.makeKeyAndVisible()
// Then you can use rootWindow?.rootViewController