Monday, June 25, 2018

Navigation bar appear from black color?

By Hường Hana 11:30 PM , , Leave a Comment

I am setting a new navigation for my app on launch. But when I launch it appears from a black color animation.After black color it sets it navigation bar. Please tell me what is issue.

I am using below code

var controller = UIViewController()  //App Theming var navController = UINavigationController() navController.navigationBar.barTintColor = UIColor.white navController.navigationBar.tintColor = UIColor.white navController.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white] navController.navigationBar.shadowImage = UIImage()  navController.navigationBar.setBackgroundImage(UIImage(), for: .default) navController.navigationBar.isTranslucent = false navController = UINavigationController(rootViewController: viewcontroller) navController.navigationBar.isHidden = true  let appDelegate = UIApplication.shared.delegate as! AppDelegate appDelegate.window?.rootViewController = navController appDelegate.window?.makeKeyAndVisible()

4 Answers

Answers 1

The problem is this line: 

navController.navigationBar.isHidden = true

Delete it and try again.

Answers 2

Please use snippet bellow

In this I am using ViewController from Main storyboard

   // mainStoryboard         let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)          // rootViewController         let rootViewController = mainStoryboard.instantiateViewController(withIdentifier: "ViewController") as? ViewController          // navigationController         let navigationController = UINavigationController(rootViewController: rootViewController!)          //App Theming         navigationController.navigationBar.barTintColor = UIColor.white         navigationController.navigationBar.tintColor = UIColor.white         navigationController.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]         navigationController.title = "Testing Th"         navigationController.navigationBar.shadowImage = UIImage()           navigationController.navigationBar.setBackgroundImage(UIImage(), for: .default)         navigationController.navigationBar.isTranslucent = false         navigationController.navigationBar.isHidden = true         // self.window         self.window = UIWindow(frame: UIScreen.main.bounds)         self.window!.rootViewController = navigationController         self.window!.makeKeyAndVisible()

If I unhide NavigationBar

    navigationController.navigationBar.isHidden = false

you can clearly see the results enter image description here

Answers 3

  • I can see that you did not give the navigationController any viewControllers.

  • You need to pass the navigation controller at least one viewController for it to know which viewController to start your navigation process from, follow the code below:

    var window: UIWindow? let nav = UINavigationController()

1- here is where i declared my Initial viewController (where i want my navigation process to start from)

var  main = HomeViewController(nibName: "HomeViewController", bundle: nil)

2- here is where i give the navigationController the first viewController to start from.

    window?.rootViewController = nav     nav.viewControllers = [main]//you need to have this line     nav.isNavigationBarHidden = true     window?.makeKeyAndVisible()

Answers 4

alright i just noticed you're using storyboards, give this a try:

var storyboard = UIStoryboard(name: "Main", bundle: nil) var ivc = storyboard.instantiateViewController(withIdentifier: "ViewController") as? ViewController navigationController?.pushViewController(anIvc, animated: true) window.rootViewController = ivc window.rootViewController = navigationController window.makeKeyAndVisible()
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