Programmatically set the initial view controller using Storyboards
IosObjective CSwiftUiviewcontrollerUistoryboardIos Problem Overview
How do I programmatically set the InitialViewController
for a Storyboard? I want to open my storyboard to a different view depending on some condition which may vary from launch to launch.
Ios Solutions
Solution 1 - Ios
How to without a dummy initial view controller
Ensure all initial view controllers have a Storyboard ID.
In the storyboard, uncheck the "Is initial View Controller" attribute from the first view controller.
If you run your app at this point you'll read:
> Failed to instantiate the default view controller for UIMainStoryboardFile 'MainStoryboard' - perhaps the designated entry point is not set?
And you'll notice that your window property in the app delegate is now nil.
In the app's setting, go to your target and the Info
tab. There clear the value of Main storyboard file base name
. On the General
tab, clear the value for Main Interface
. This will remove the warning.
Create the window and desired initial view controller in the app delegate's application:didFinishLaunchingWithOptions:
method:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
UIViewController *viewController = // determine the initial view controller here and instantiate it with [storyboard instantiateViewControllerWithIdentifier:<storyboard id>];
self.window.rootViewController = viewController;
[self.window makeKeyAndVisible];
return YES;
}
Solution 2 - Ios
For all the Swift lovers out there, here is the answer by @Travis translated into SWIFT:
Do what @Travis explained before the Objective C code. Then,
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
var exampleViewController: ExampleViewController = mainStoryboard.instantiateViewControllerWithIdentifier("ExampleController") as! ExampleViewController
self.window?.rootViewController = exampleViewController
self.window?.makeKeyAndVisible()
return true
}
The ExampleViewController
would be the new initial view controller you would like to show.
The steps explained:
- Create a new window with the size of the current window and set it as our main window
- Instantiate a storyboard that we can use to create our new initial view controller
- Instantiate our new initial view controller based on it's Storyboard ID
- Set our new window's root view controller as our the new controller we just initiated
- Make our new window visible
Enjoy and happy programming!
Solution 3 - Ios
You can programmatically set the key window's rootViewController in (BOOL)application:(UIApplication *)application willFinishLaunchingWithOptions:(NSDictionary *)launchOptions
for example:
- (BOOL)application:(UIApplication *)application willFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
if (shouldShowAnotherViewControllerAsRoot) {
UIStoryboard *storyboard = self.window.rootViewController.storyboard;
UIViewController *rootViewController = [storyboard instantiateViewControllerWithIdentifier:@"rootNavigationController"];
self.window.rootViewController = rootViewController;
[self.window makeKeyAndVisible];
}
return YES;
}
Solution 4 - Ios
SWIFT 5
If you don't have a ViewController set as the initial ViewController in storyboard, you need to do 2 things:
- Go to your project TARGETS, select your project -> General -> Clear the Main Interface field.
- Always inside project TARGETS, now go to Info -> Application Scene Manifest -> Scene Configuration -> Application Session Role -> Item0 (Default Configuration) -> delete the storyboard name field.
Finally, you can now add your code in SceneDelegate:
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
// Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
// If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
// This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
guard let windowScene = (scene as? UIWindowScene) else { return }
window = UIWindow(windowScene: windowScene)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
// Make sure you set an Storyboard ID for the view controller you want to instantiate
window?.rootViewController = storyboard.instantiateViewController(withIdentifier: identifier)
window?.makeKeyAndVisible()
}
Solution 5 - Ios
Swift 3: Update to @victor-sigler's code
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
self.window = UIWindow(frame: UIScreen.main.bounds)
// Assuming your storyboard is named "Main"
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
// Add code here (e.g. if/else) to determine which view controller class (chooseViewControllerA or chooseViewControllerB) and storyboard ID (chooseStoryboardA or chooseStoryboardB) to send the user to
if(condition){
let initialViewController: chooseViewControllerA = mainStoryboard.instantiateViewController(withIdentifier: "chooseStoryboardA") as! chooseViewControllerA
self.window?.rootViewController = initialViewController
)
}else{
let initialViewController: chooseViewControllerB = mainStoryboard.instantiateViewController(withIdentifier: "chooseStoryboardB") as! chooseViewControllerB
self.window?.rootViewController = initialViewController
)
self.window?.makeKeyAndVisible(
return true
}
Solution 6 - Ios
You can set Navigation rootviewcontroller as a main view controller. This idea can use for auto login as per application requirement.
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil];
UIViewController viewController = (HomeController*)[mainStoryboard instantiateViewControllerWithIdentifier: @"HomeController"];
UINavigationController navController = [[UINavigationController alloc] initWithRootViewController:viewController];
self.window.rootViewController = navController;
if (NSFoundationVersionNumber > NSFoundationVersionNumber_iOS_6_1) {
// do stuff for iOS 7 and newer
navController.navigationBar.barTintColor = [UIColor colorWithRed:88/255.0 green:164/255.0 blue:73/255.0 alpha:1.0];
navController.navigationItem.leftBarButtonItem.tintColor = [UIColor colorWithRed:88/255.0 green:164/255.0 blue:73/255.0 alpha:1.0];
navController.navigationBar.tintColor = [UIColor whiteColor];
navController.navigationItem.titleView.tintColor = [UIColor whiteColor];
NSDictionary *titleAttributes =@{
NSFontAttributeName :[UIFont fontWithName:@"Helvetica-Bold" size:14.0],
NSForegroundColorAttributeName : [UIColor whiteColor]
};
navController.navigationBar.titleTextAttributes = titleAttributes;
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];
}
else {
// do stuff for older versions than iOS 7
navController.navigationBar.tintColor = [UIColor colorWithRed:88/255.0 green:164/255.0 blue:73/255.0 alpha:1.0];
navController.navigationItem.titleView.tintColor = [UIColor whiteColor];
}
[self.window makeKeyAndVisible];
For StoryboardSegue Users
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil];
// Go to Login Screen of story board with Identifier name : LoginViewController_Identifier
LoginViewController *loginViewController = (LoginViewController*)[mainStoryboard instantiateViewControllerWithIdentifier:@“LoginViewController_Identifier”];
navigationController = [[UINavigationController alloc] initWithRootViewController:testViewController];
self.window.rootViewController = navigationController;
[self.window makeKeyAndVisible];
// Go To Main screen if you are already Logged In Just check your saving credential here
if([SavedpreferenceForLogin] > 0){
[loginViewController performSegueWithIdentifier:@"mainview_action" sender:nil];
}
Thanks
Solution 7 - Ios
Open mainstoryboard, select the view that you want start first, then open Utilities--> Attributes. Below the "View Controller" you see the "Is initial View Controller" radio button. Just select it.
--- To the revised question:
May be you can try this: write a method in ViewDidLoad section of your inital view and when the method runs on application launch, method triggers a segue to another view.
Solution 8 - Ios
I don't think it's possible. Instead you can have one initial controller which will have segues to different view controllers. On startup, you can decide which segue to perform programmatically.
Solution 9 - Ios
You can set initial view controller
using Interface Builder as well as programmatically.
Below is approach used for programmatically.
Objective-C :
self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
UIViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:@"HomeViewController"]; // <storyboard id>
self.window.rootViewController = viewController;
[self.window makeKeyAndVisible];
return YES;
Swift :
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
var objMainViewController: MainViewController = mainStoryboard.instantiateViewControllerWithIdentifier("MainController") as! MainViewController
self.window?.rootViewController = objMainViewController
self.window?.makeKeyAndVisible()
return true
Solution 10 - Ios
In AppDelegate.swift
you can add the following code:
let sb = UIStoryboard(name: "Main", bundle: nil)
let vc = sb.instantiateViewController(withIdentifier: "YourViewController_StorboardID")
self.window?.rootViewController = vc
self.window?.makeKeyAndVisible()
Of course, you need to implement your logic, based on which criteria you'll choose an appropriate view controller.
Also, don't forget to add an identity (select storyboard -> Controller Scene -> Show the identity inspector -> assign StorboardID).
Solution 11 - Ios
Another solution with using Swift 3 and Swift 4 with avoiding force casting is like this
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
self.window = UIWindow(frame: UIScreen.main.bounds)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
guard let viewController = storyboard.instantiateViewController(withIdentifier: "YourViewController") as? YourViewController else {
return false
}
self.window?.rootViewController = viewController
self.window?.makeKeyAndVisible()
return true
}
And below is using with UINavigationController
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
self.window = UIWindow(frame: UIScreen.main.bounds)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
guard let viewController = storyboard.instantiateViewController(withIdentifier: "YourViewController") as? YourViewController else {
return false
}
let navigationController = UINavigationController(rootViewController: viewController)
self.window?.rootViewController = navigationController
self.window?.makeKeyAndVisible()
return true
}
Solution 12 - Ios
If you are using Scene Delegates in iOS 13+:
Make sure in your Info.plist
file you find the row at:
Application Scene Manifest > Scene Configuration > Application Session Role > Item 0
and delete the reference to the Main Storyboard there as well. Otherwise you'll get the same warning about failing to instantiate from storyboard.
Also, move the code from the app delegate to the scene delegate method scene(_:willConnectTo:options:)
, since this is where life cycle events are handled now.
Solution 13 - Ios
I created a routing class to handle dynamic navigation and keep clean AppDelegate class, I hope it will help other too.
//
// Routing.swift
//
//
// Created by Varun Naharia on 02/02/17.
// Copyright © 2017 TechNaharia. All rights reserved.
//
import Foundation
import UIKit
import CoreLocation
class Routing {
class func decideInitialViewController(window:UIWindow){
let userDefaults = UserDefaults.standard
if((Routing.getUserDefault("isFirstRun")) == nil)
{
Routing.setAnimatedAsInitialViewContoller(window: window)
}
else if((userDefaults.object(forKey: "User")) != nil)
{
Routing.setHomeAsInitialViewContoller(window: window)
}
else
{
Routing.setLoginAsInitialViewContoller(window: window)
}
}
class func setAnimatedAsInitialViewContoller(window:UIWindow) {
Routing.setUserDefault("Yes", KeyToSave: "isFirstRun")
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let animatedViewController: AnimatedViewController = mainStoryboard.instantiateViewController(withIdentifier: "AnimatedViewController") as! AnimatedViewController
window.rootViewController = animatedViewController
window.makeKeyAndVisible()
}
class func setHomeAsInitialViewContoller(window:UIWindow) {
let userDefaults = UserDefaults.standard
let decoded = userDefaults.object(forKey: "User") as! Data
User.currentUser = NSKeyedUnarchiver.unarchiveObject(with: decoded) as! User
if(User.currentUser.userId != nil && User.currentUser.userId != "")
{
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let homeViewController: HomeViewController = mainStoryboard.instantiateViewController(withIdentifier: "HomeViewController") as! HomeViewController
let loginViewController: UINavigationController = mainStoryboard.instantiateViewController(withIdentifier: "LoginNavigationViewController") as! UINavigationController
loginViewController.viewControllers.append(homeViewController)
window.rootViewController = loginViewController
}
window.makeKeyAndVisible()
}
class func setLoginAsInitialViewContoller(window:UIWindow) {
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let loginViewController: UINavigationController = mainStoryboard.instantiateViewController(withIdentifier: "LoginNavigationViewController") as! UINavigationController
window.rootViewController = loginViewController
window.makeKeyAndVisible()
}
class func setUserDefault(_ ObjectToSave : Any? , KeyToSave : String)
{
let defaults = UserDefaults.standard
if (ObjectToSave != nil)
{
defaults.set(ObjectToSave, forKey: KeyToSave)
}
UserDefaults.standard.synchronize()
}
class func getUserDefault(_ KeyToReturnValye : String) -> Any?
{
let defaults = UserDefaults.standard
if let name = defaults.value(forKey: KeyToReturnValye)
{
return name as Any
}
return nil
}
class func removetUserDefault(_ KeyToRemove : String)
{
let defaults = UserDefaults.standard
defaults.removeObject(forKey: KeyToRemove)
UserDefaults.standard.synchronize()
}
}
And in your AppDelegate call this
self.window = UIWindow(frame: UIScreen.main.bounds)
Routing.decideInitialViewController(window: self.window!)
Solution 14 - Ios
A few days ago I've encountered to same situation. A very simple trick solved this problem. I set hidden my initial view controller before launch2. If initial view controller is the right controller it's set to visible in viewDidLoad. Else, a segue is performed to desired view controller. It works perfectly in iOS 6.1 and above. I'm sure it works on earlier versions of iOS.
Solution 15 - Ios
Thanks modified this as follows in AppDelegate:
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
//Some code to check value of pins
if pins! == "Verified"{
print(pins)
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
let mainStoryboard: UIStoryboard = UIStoryboard(name: "HomePage", bundle: nil)
let exampleViewController: UINavigationController = mainStoryboard.instantiateViewControllerWithIdentifier("SBHP") as! UINavigationController
self.window?.rootViewController = exampleViewController
self.window?.makeKeyAndVisible()
}else{
print(pins)
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let exampleViewController: UINavigationController = mainStoryboard.instantiateViewControllerWithIdentifier("SBUser") as! UINavigationController
self.window?.rootViewController = exampleViewController
self.window?.makeKeyAndVisible()
}
Solution 16 - Ios
Found simple solution - no need to remove "initial view controller check" from storyboard and editing project Info tab and use makeKeyAndVisible
, just place
self.window.rootViewController = rootVC;
in
- (BOOL) application:didFinishLaunchingWithOptions:
Solution 17 - Ios
let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
let vc = mainStoryboard.instantiateViewController(withIdentifier: "storyBoardid") as! ViewController
let navigationController = UINavigationController(rootViewController: vc)
UIApplication.shared.delegate.window?.rootViewController = navigationController
Another way is to present viewController,
let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
let vc = mainStoryboard.instantiateViewController(withIdentifier: "storyBoardid") as! ViewController
self.present(vc,animated:true,completion:nil)
First you need to create object of your storyboard then change root(if required) then you take reference of particular view controller which is pushed current view controller(if you change root) else it's just present new view controller which may you
Solution 18 - Ios
Swift 4, Xcode 9
in file AppDelegate.swift
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let firstVC = storyboard.instantiateViewController(withIdentifier: "firstViewController") as! firstViewController
self.window?.rootViewController = firstVC
}
Solution 19 - Ios
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
self.window = UIWindow(frame: UIScreen.main.bounds)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
if (PreferenceHelper.getAccessToken() != "") {
let initialViewController = storyboard.instantiateViewController(withIdentifier: "your View Controller Identifier")
self.window?.rootViewController = initialViewController
} else {
let initialViewController = storyboard.instantiateViewController(withIdentifier: "your View Controller identifier")
self.window?.rootViewController = initialViewController
}
self.window?.makeKeyAndVisible()
return true
}
/*
use your view Controller identifier must use it doubles quotes**strong text**
Solution 20 - Ios
Swift 5 or above# make route view controller by this simple code.
If you are using xcode 11 or above first initialise var window: UIWindow?
in AppDelegate
let rootVC = mainStoryboard.instantiateViewController(withIdentifier: "YOURCONTROLLER") as! YOURCONTROLLER
navigationController.setNavigationBarHidden(true, animated: true)
UIApplication.shared.windows.first?.rootViewController = UINavigationController.init(rootViewController: rootVC)
UIApplication.shared.windows.first?.makeKeyAndVisible()
Solution 21 - Ios
If you prefer not to change applicationDidFinish, you can do the following trick:
Set Navigation controller as an initial view controller and assign to it a custom class 'MyNavigationController'. Then you can tweak its root view controller during viewDidLoad - it will override the root view controller that you set in your storyboard.
class MyNavigationController: UINavigationController {
override func viewDidLoad() {
super.viewDidLoad()
if !isLoggedIn() {
viewControllers = [R.storyboard.authentication.loginView()!]
}
}
private func isLoggedIn() -> Bool {
return false
}
}
Solution 22 - Ios
Xcode 12.4 Swift 5
in SceneDelegate.Swift
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
guard let windowScene = (scene as? UIWindowScene) else { return }
let window = UIWindow(windowScene: windowScene)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
window.rootViewController = storyboard.instantiateViewController(withIdentifier: "UserViewController") as! UserViewController
self.window = window
window.makeKeyAndVisible()
}
You can add your condition which view controller scene will dispaly
Solution 23 - Ios
Set initial ViewController using Storyboards(instead of Main)
-
Main.storyboard
-> View Controller -> Attributes Inspector -> UncheckIs Initial View Controller
-
App target -> General -> remove all from
Main Interface
-
Edit App delegate
@main
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
self.window = UIWindow(frame: UIScreen.main.bounds)
let storyboard: UIStoryboard = UIStoryboard(name: "SomeStoryboard", bundle: nil) //SomeStoryboard is name of .storyboard
let viewController: ViewController = storyboard.instantiateViewController(withIdentifier: "someStoryboardId") as! ViewController //someStoryboardId is Storyboard ID
self.window?.rootViewController = viewController
self.window?.makeKeyAndVisible()
return true
}
}
Solution 24 - Ios
Select the view controller which you want to open first and go to attribute inspector. Go to initial scene and check is initial view controller option.
Now this will be your initial view controller that will open first when application launch.