Programmatically Creating Uinavigationcontroller in iOS

Programmatically creating UINavigationController in iOS

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
ImageViewController2 *dealVC = (ImageViewController2 *)[storyboard instantiateViewControllerWithIdentifier:@"ImageViewController2"];
[self.navigationController pushViewController:dealVC animated:YES];

where ImageViewController2 is a class name

Creating a navigationController programmatically (Swift)

In AppDelegate.swift

Swift 1, 2:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
   self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
   var nav1 = UINavigationController()
   var mainView = ViewController(nibName: nil, bundle: nil) //ViewController = Name of your controller
   nav1.viewControllers = [mainView]
   self.window!.rootViewController = nav1
   self.window?.makeKeyAndVisible()
}

Swift 4+: and Swift 5+

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
   self.window = UIWindow(frame: UIScreen.main.bounds)
   let nav1 = UINavigationController()
   let mainView = ViewController(nibName: nil, bundle: nil) //ViewController = Name of your controller
   nav1.viewControllers = [mainView]
   self.window!.rootViewController = nav1
   self.window?.makeKeyAndVisible()
}

How to create a UINavigationControll in UIViewController programmatically Swift

Maybe have a look at "Showing and Hiding View Controllers" where some navigation concepts are explained: https://developer.apple.com/documentation/uikit/view_controllers/showing_and_hiding_view_controllers

When using storyboards you should be able to use a segue to navigate from one view controller to another.

Create a UINavigationController programmatically

This looks like a case of unoptimized app for iPhone X and others. How are you doing the launchscreen? Since I don't see a LaunchScreen.storyboard I assume you are using image assets. That is frowned upon because you would need to update your app once a new screen size is created.

TL:DR Use LaunchScreen.storybooard for Launch Screen File VS Launch Images Source

EDITED: Create a LaunchScreen.storyboard and set it to Launch Screen file

navigation controller that i create programmatically not appearing as in examples

If you are using Xcode 11 and iOS 13, you need to write same code in SceneDelegate.swift. The main reason for Apple to add UISceneDelegate to iOS 13 was to create a good entry point for multi-windowed applications.

If you do not intend to support multiple windows, you can remove SceneDelegate.swift file remove UIApplicationSceneManifest key from Info.plist and remove func application(_: configurationForConnecting:, options:) and func application(_:, didDiscardSceneSessions:) methods from AppDelegate.swift

Learn more about Scene Delegate on donnywalls - Understanding the iOS 13 Scene Delegate

How to add a navigation controller programmatically in code but not as initial view controller

You can add UINavigationController like below :

First you have to create object of SecondViewController,

let myViewController: SecondViewController? = storyboard?.instantiateViewController(withIdentifier: "SecondViewController")

Or

let myViewController: SecondViewController? = SecondViewController(nibName: "SecondViewController", bundle: nil)

Or

let myViewController: SecondViewController? = SecondViewController()

Then add Navigation to SecondViewController

let myNavigationController = UINavigationController(rootViewController: myViewController!)
    

If you want to present then use :

self.present(myNavigationController, animated: true) { 
}

If you want to push then use :

self.navigationController?.pushViewController(myNavigationController, animated: true)

If you want to set as root controller then use :

let appDelegate: AppDelegate = (UIApplication.shared.delegate as? AppDelegate)!
appDelegate.window?.rootViewController = myNavigationController

How to add navigation controller programmatically?

try as below

UIViewController *bbp=[[UIViewController alloc]initWithNibName:@"UIViewController" bundle:nil];
UINavigationController *passcodeNavigationController = [[UINavigationController alloc] initWithRootViewController:bbp];
// [self.navigationController presentModalViewController:passcodeNavigationController animated:YES];
  [self.navigationController pushViewController:passcodeNavigationController animated:YES];
  [passcodeNavigationController release];

iOS: Navigation Bar of a Programmatically created UINavigationController Not Expanding to Safe Area

Just add this to the end of your navigationBarConfiguration func

        if #available(iOS 13.0, *) {
            let navBarAppearance = UINavigationBarAppearance()
            navBarAppearance.configureWithOpaqueBackground()
            navBarAppearance.backgroundColor = UIColor.systemBlue
            controller.navigationBar.standardAppearance = navBarAppearance
            controller.navigationBar.scrollEdgeAppearance = navBarAppearance
        } else {
            controller.edgesForExtendedLayout = []
        }

UINavigationController appDelegate UIViewController programmatically

Result:

Code:

AppDelegate:

    window = UIWindow()
    let firstVC = FirstViewController()
    let navigationController = UINavigationController(rootViewController: firstVC)
    window?.rootViewController = navigationController
    window?.makeKeyAndVisible()

FirstVC:

override func viewDidLoad() {
    super.viewDidLoad()

    view.backgroundColor = .green

    let button = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 100))
    button.backgroundColor = .red
    view.addSubview(button)
    button.addTarget(self, action: #selector(showSecondVC), for: .touchUpInside)
}

@objc func showSecondVC() {
    let secondVC = SecondViewController()
    navigationController?.pushViewController(secondVC, animated: true)
}

SecondVC:

view.backgroundColor = .yellow

Hope it helps! Please let me know if it works for you or not.

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