Customize UINavigationBar Appearance Programmatically via AppDelegate

The Swift code example below demonstrates how to customize the UINavigationBar appearance via the AppDelegate.swift file.

The blow Swift code example covers:

• Set UINavigationBar tint color,
• Set Navigation bar Title color,
• Set navigation bar ItemButton tint color,
• Set Navigation bar background image,
• Set navigation bar Back button tint color.

import UIKit

@main
class AppDelegate: UIResponder, UIApplicationDelegate {



    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        
        // Set navigation bar tint / background colour
        UINavigationBar.appearance().barTintColor = UIColor.red
        
        // Set Navigation bar Title colour
    UINavigationBar.appearance().titleTextAttributes = [NSAttributedString.Key.foregroundColor:UIColor.white]
        
        // Set navigation bar ItemButton tint colour
        UIBarButtonItem.appearance().tintColor = UIColor.yellow
        
        // Set Navigation bar background image
        let navBgImage:UIImage = UIImage(named: "bg_blog_navbar_reduced.jpg")!
        UINavigationBar.appearance().setBackgroundImage(navBgImage, for: .default)
        
        //Set navigation bar Back button tint colour
        UINavigationBar.appearance().tintColor = UIColor.white
        return true
    }

    // MARK: UISceneSession Lifecycle

    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        // Called when a new scene session is being created.
        // Use this method to select a configuration to create the new scene with.
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }

    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
        // Called when the user discards a scene session.
        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
    }


}

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