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
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
}
}
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;
}
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
}
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!)
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
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
}