Once i Login why i am not getting HomeViewController as Rootviewcontroller in Swift? - ios

Question

In appdelegate i am getting UserId.. means i am login but when i run second time i am not getting homeviewcontroller as rootviewcontroller why? still it shows phonenumviewcontroller
navigationcontroller -> phonenumviewcontroller -> registrationiewcontroller -> homeviewcontroller
In storyboard navigationcontroller is initialviewcontroller
In registrationviewcontroller i am getting userId which i have saved in keychain.
I dont have signout button so i have written code like below in registrationiewcontroller
do {
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! [String:AnyObject]
print("terms and condition JSON \(json)")
let jsonObj: String = json["Success"] as? String ?? ""
if jsonObj == "true" {
let userID: String=jsonObj?["userId"] as? String ?? ""
DispatchQueue.main.async {
KeychainWrapper.standard.set(userID, forKey: "USERID")
let viewController = self.storyboard?.instantiateViewController(withIdentifier: "HomeViewController") as! HomeViewController;
UserDefaults.standard.set("NoLogout", forKey:"Signout")
self.navigationController?.pushViewController(viewController, animated: true);
}
}
}
no signout button so added this code in registrationviewcontroller
UserDefaults.standard.set("NoLogout", forKey:"Signout")
this code in appdelegate: getting userId but still homeviewcontroller is not coming as rootviewcontroller, only phonenumviewcontroller is coming why?
var savedUserId: String?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
savedUserId = KeychainWrapper.standard.string(forKey: "USERID")
KeychainWrapper.standard.set(savedUserId ?? "", forKey: "PersonalID")
print("appdelegate userid \(savedUserId)")
logOutString = UserDefaults.standard.string(forKey: "Signout") as NSString? ?? "" as NSString
if logOutString.isEqual(to: "NoLogout") {
self.window = UIWindow(frame: UIScreen.main.bounds)
let storyBoard = UIStoryboard.init(name: "Main", bundle: nil)
let viewcontroller = storyBoard.instantiateViewController(withIdentifier: "HomeViewController")
let navigationController = UINavigationController(rootViewController: viewcontroller)
self.window?.rootViewController = navigationController
self.window?.makeKeyAndVisible()
}
else {
}
return true
}
once registration is completed i need rootviewcontroller as homeviewcontroller... how to get that, please help me with code

Answer 1

From whatever I've gathered, here's what you need to do:
In AppDelegate:
import UIKit
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
let isUserLoggedIn = UserDefaults.standard.bool(forKey: "isUserLoggedIn") // Give you own check to see if user is logged in
window = UIWindow()
window?.makeKeyAndVisible()
let viewController = isUserLoggedIn ? MainViewController() : LoginViewController()
window?.rootViewController = UINavigationController(rootViewController: viewController)
return true
}
}
class MainViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .green
navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Logout", style: .plain, target: self, action: #selector(handleUserLoggedOut))
}
#objc func handleUserLoggedOut() {
UserDefaults.standard.set(false, forKey: "isUserLoggedIn")
UIApplication.shared.keyWindow?.rootViewController = UINavigationController(rootViewController: LoginViewController())
}
}
class LoginViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .red
navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Login", style: .plain, target: self, action: #selector(handleUserLoggedIn))
}
#objc func handleUserLoggedIn() {
UserDefaults.standard.set(true, forKey: "isUserLoggedIn")
UIApplication.shared.keyWindow?.rootViewController = UINavigationController(rootViewController: MainViewController())
}
}
This is only a skeleton. Give both controller different background colours and button action to call handleUserLoginIn and handleUserLoggedOut on respective controllers and see how it works. Play around with it and figure out.
Note: keyWindow is deprecated so you need to use this instead at all places.
let keyWindow = UIApplication.shared.connectedScenes
.filter({$0.activationState == .foregroundActive})
.map({$0 as? UIWindowScene})
.compactMap({$0})
.first?.windows
.filter({$0.isKeyWindow}).first
Edit: I've also added the login, logout buttons and set backgroundColors for you to see for yourself the result.