Programmatically set the initial view controller using Storyboards

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感情败类 2020-11-22 15:00

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

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  • 2020-11-22 15:12

    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
        }
    
    }
    
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  • 2020-11-22 15:14

    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;
    }
    
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  • 2020-11-22 15:14

    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
    }
    
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  • 2020-11-22 15:14

    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!)
    
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  • 2020-11-22 15:15

    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

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  • 2020-11-22 15:15

    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
    }
    
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