How do I dismiss a rootViewController before presenting a new UITabBarController? - ios

Question

I've set up a UIViewController as my rootViewController in AppDelegate, however, when a user logs in or skips it I am presenting a UITabBarController over the top.
I need to dismiss the LoginController, and set the UITabController as rootViewController instead after user logs in.
How can I go about reorganizing this?
AppDelegate()
window = UIWindow()
window?.makeKeyAndVisible()
window?.rootViewController = LoginController()
LoginController()
self.present(MainTabBarController(), animated: true, completion: nil)

Answer 1

you can design your code like this.
This one

Answer 2

It's too easy to maintain condition for user logged in or not, and then based on that status. You can navigate to your view.
You can try this way :
1.In AppDelegate you can these methods.
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
let isLogin = UserDefaults.standard.bool(forKey: "IS_LOGIN")
if isLogin == true {
self.goToDashboardView()
} else {
self.goToLoginView()
}
return true
}
//MARK:- ------- Global Methods -------
class func sharedInstance() -> AppDelegate {
return UIApplication.shared.delegate as! AppDelegate
}
func goToLoginView() {
let sb = UIStoryboard.init(name: "Main", bundle: nil)
let loginVC = sb.instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController
let navVC = UINavigationController(rootViewController: loginVC) // You can skip this if you do not want to add navigation bar
self.window?.rootViewController = navVC // if you skipped above line, then you have to assign 'loginVC' here.
self.window?.makeKeyAndVisible()
}
func goToDashboardView() {
let sb = UIStoryboard.init(name: "Main", bundle: nil)
let tabbarVC = sb.instantiateViewController(withIdentifier: "MyTabBarController") as! MyTabBarController
self).window?.rootViewController = tabbarVC // if you skipped above line, then you have to assign 'loginVC' here.
self.window?.makeKeyAndVisible()
}
2.In LoginViewController, when user logged in successfully.
#IBAction func btnLoginClicked(_ sender: UIButton) {
// Your API call or other code
// If all things goes well, then login and go to dashboard
UserDefaults.standard.set(true, forKey: "IS_LOGIN")
AppDelegate.sharedInstance().goToDashboardView()
}
3.And finally, whenever and from wherever you want to log out from app, just call below code.
#IBAction func btnLogOutClicked(_ sender: UIButton) {
// Your API call or other code
// If all things goes well, then logout and go to login view
UserDefaults.standard.set(false, forKey: "IS_LOGIN")
AppDelegate.sharedInstance().goToLoginView()
}
4.And Main.storyboard should have design something like :

Answer 3

you do not need to present the UITabBarViewController and then dismiss the LoginViewController, you just need to reset the UITabBarViewController as a rootViewController for you app after login or skip as the following:
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
// Override point for customization after application launch.
let yourTabBar = UIStoryboard(name: "YOUR_STORYBOARD_NAME", bundle: nil).instantiateViewController(withIdentifier: "YOUR_UITABBARCONTROLLER_ID")
self.window!.rootViewController = yourTabBar
self.window!.makeKeyAndVisible()
return true
}