check if user is logged in ios swift - ios

Question

i want check in appdelegate.swift file if user logged in showing HomeviewController like Instagram and if not Showing LoginViewController , iam using mysql to save users data and php bridge lang
code in appdalegate.swift
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
var rootViewController = self.window!.rootViewController
let isUserLoggedIn:Bool = NSUserDefaults.standardUserDefaults().boolForKey("isUserLoggedIn")
if(isUserLoggedIn) {
let mainStoryboard = UIStoryboard(name: "Main" , bundle: nil)
let protectedPage = mainStoryboard.instantiateViewControllerWithIdentifier("goToHome") as! HomeViewController
window!.rootViewController = protectedPage
window!.makeKeyAndVisible()
}
else{
let mainStoryboard = UIStoryboard(name: "Main" , bundle: nil)
let loginViewController = mainStoryboard.instantiateViewControllerWithIdentifier("loginview") as! LoginViewController
window!.rootViewController = loginViewController
window!.makeKeyAndVisible()
}
return true
}
loginviewcontoler.swift
let success:NSInteger = jsonData.valueForKey("success") as! NSInteger
//[jsonData[#"success"] integerValue];
NSLog("Success: %ld", success);
if(success == 1)
{
NSLog("Login SUCCESS");
let prefs:NSUserDefaults = NSUserDefaults.standardUserDefaults()
prefs.setObject(username, forKey: "USERNAME")
prefs.setInteger(1, forKey: "ISLOGGEDIN")
prefs.synchronize()
self.performSegueWithIdentifier("goToHome", sender: self)
ProfileViewController.swift
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(true)
let prefs:NSUserDefaults = NSUserDefaults.standardUserDefaults()
let isLoggedIn:Int = prefs.integerForKey("ISLOGGEDIN") as Int
if (isLoggedIn != 1) {
self.performSegueWithIdentifier("goto_login", sender: self)
}
else
{
self.usernameLabel.text = prefs.valueForKey("USERNAME") as? String
}
}
sorry for long question

Answer 1

Don't use in this situation NSUserDefaults
https://github.com/matthewpalmer/Locksmith
Here is good example of using safe LogIn / LogOut
so, after implementation
if let dictionary = Locksmith.loadDataForUserAccount("accaunt")
{
//go to profile
}
else
{
//go to login
}

Answer 2

Follow step:-
Step 1 :- Create custom SplashViewController set rootViewController SplashViewController
Step 2 :- Write login service call on SplashViewController
Setp 3 :- When you get Login success then just change rootViewController
Setp 4 :- Write one method in AppDelegate For change rootViewController for redirect Homescreen.
Setp 5 :- Call AppDelegate method for go to Homescreen.

Answer 3

You have to do some works.
1. You have to make sure that the user is logged in. to do that when you press the button (login button) use UserDefaults
let userDefault = UserDefaults.standard
userDefault.set(true, forKey: "isLoggedIn")
userDefault.synchronize()
2.When user will launch the app again just check whether the user logged in or not in viewDidAppear method/ viewDidLoad(its your choice which method you will use. most of the time I use viewDidAppear)
let userDefault = UserDefaults.standard
let savedData = userDefault.bool(forKey: "isLoggedIn")
if(savedData){
performSegue(withIdentifier: "segueTest", sender:nil)//here u have decide the which view will show if the user is logged in how. here i used segue.
}else{
viewController = self// this is the main view. just make the object of the class and called it.
}
I hope you know how to prepare segue

Answer 4

Just a concise way of doing the same thing:
func checkIfUserIsLoggedIn() {
if Auth.auth().currentUser == nil {
DispatchQueue.main.async {
// present login controller
let loginVC = LoginVC()
let navController = UINavigationController(rootViewController: loginVC)
self.present(navController, animated: true, completion: nil)
}
return
}
}