iOS Swift. Change background color of Navigation Bar

In Navigation Bar we can change color for three items:

1. Background color of Navigation Bar
2. Color of items in Nvaigation Bar (buttons)
3. Color of title of Navigation Bar

To change background color of Navigation Bar we will use UIApperance API
All code must be placed in AppDelegate.swift file in method didFinishLaunchingWithOptions

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: 
        [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        
        // get appearance object
        let navigationAppearance = UINavigationBar.appearance()
        
        // change color of navigation bar background
        navigationAppearance.barTintColor = UIColor.red
        
        // change color of navigation bar items (buttons)
        navigationAppearance.tintColor = UIColor.white
        
        // change color of navigation bar title
        navigationAppearance.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.white];
        
        return true
    }
    
}

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