my storyboard
If user doesn't login, the rootViewController is Login
after user login done, rootViewController is MainTabBarController
I have done that
But, I have encounter question is Logout
My Logout is dismissViewController
If my rootViewController is Login, it works
It will remove current ViewController, so Login appear
But when my rootViewController is MainTabBarController, dismiss is not work, I've try using poptoRootViewController in vain.
what should I do in Logout ?
I want to do like this
dismissController(true,{
rootViewController = `Login`
})
For Logout do following:- (Add below code inside IBAction or didSelect ..etc method where logout is called)
// Making Login as rootViewController as user is no longer logged in
NSUserDefaults.standardUserDefaults().setBool(false, forKey: "isUserLoggedIn")
NSUserDefaults.standardUserDefaults().synchronize()
let loginVC = self.storyboard?.instantiateViewControllerWithIdentifier("Login") as! loginViewController
let appDel:AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
appDel.window?.rootViewController = loginVC
Also add following in AppDelegate:-
// Checking user login status, if user already logged in then making main tab bar view controller as root view controller
let userLoginStatus = NSUserDefaults.standardUserDefaults().boolForKey("isUserLoggedIn")
if(userLoginStatus)
{
let mainStoryBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let centerVC = mainStoryBoard.instantiateViewControllerWithIdentifier("MainTabBar") as! ViewController
window!.rootViewController = centerVC
window!.makeKeyAndVisible()
}
And Also where login Validation is done, after validating user credentials:-
#IBAction func loginTapped(sender: AnyObject) {
let appDel:AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let mainStoryBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let centerVC = mainStoryBoard.instantiateViewControllerWithIdentifier("MainTabBar") as! ViewController
// Important to set status to true
NSUserDefaults.standardUserDefaults().setBool(true, forKey: "isUserLoggedIn")
NSUserDefaults.standardUserDefaults().synchronize()
appDel.window!.rootViewController = centerVC
appDel.window!.makeKeyAndVisible()
}
NOTE:- Don't forget to add STORYBOARD IDs for required View Controllers to instiantiate them
You just need to make a function in AppDelegate and call that function on logout.
eg.(Obj-C Version)
- (void) setCurrentRootController : (UIViewController *)viewController {
[[[UIApplication sharedApplication].delegate window] setRootViewController:nil];
UINavigationController *navigation = [[UINavigationController alloc]initWithRootViewController:viewController];
[[[UIApplication sharedApplication].delegate window] setRootViewController:navigation];
}
When you are doing logout you just need to set rootViewController and then call popToRootViewController method.
Hope this will work for you !!
You don't need to use any additional technics to set rootViewController in runtime except following:
UIApplication.sharedApplication().keyWindow?.rootViewController = viewController;
You can wrap this with animation if you want
In Swift You can do like this
let vc: UIViewController! = self.storyboard!.instantiateViewControllerWithIdentifier("LoginViewController")
let window = UIApplication.sharedApplication().windows[0];
window.rootViewController = vc;
You can maintain two windows, one is for login, and second one for the users who got authenticated.
This way you can easily switch btw windows rather than having a messy MVC for it.
Warning, make sure your are in the main thread if you use Delegate or Completion methods.
Code in Swift 3
DispatchQueue.main.async {
guard let tb = self.storyboard?.instantiateViewController(withIdentifier: "LoggedUser") as? UITabBarController else {
print("Could not instantiate view controller with identifier of type LoggedUser")
return
}
self.present(tb, animated: true, completion: nil)}
Related
I'm building an app that can receive Firebase's Dynamic Link and redirects it into a certain UIViewController after clicking the link. So based on this question that I asked, I have the code in AppDelegate.swift that navigates the app to the UIViewController like this:
func goToDynamicLinkVC() { // This function is in AppDelegate.swift
let destinationStoryboard: UIStoryboard = UIStoryboard(name: "DynamicLink", bundle: nil)
let destinationVC = destinationStoryboard.instantiateViewController(withIdentifier: "DynamicLinkView") as? DynamicLinkVC
self.window = UIWindow(frame: UIScreen.main.bounds)
self.window?.rootViewController = destinationVC
self.window?.makeKeyAndVisible()
}
And in that UIViewController I also have a function that moves to another UIViewController if a user pressed a button like this:
func routeToDynamicForm() { // This function is in DynamicLinkVC class
let destinationVC = UIStoryboard(name: "DynamicLink", bundle: nil).instantiateViewController(withIdentifier: "DynamicFormView") as! DynamicFormVC
self.navigationController?.pushViewController(destinationVC, animated: true)
}
But weirdly enough now that I pressed the button it doesn't move me to the next View Controller (in this case, DynamicFormVC). I've tried to debug the button whether it's working or not by doing this:
print("button tapped")
It shows the message on the debug area, but it still doesn't redirects to the next view controller. So what can I do to resolve this? If you need more information feel free to ask and I will provide it to you. Thank you.
I changed the goToDynamicLinkVC function to something like this:
func goToDynamicLinkVC() { // This function is in AppDelegate.swift
let destinationStoryboard: UIStoryboard = UIStoryboard(name: "DynamicLink", bundle: nil)
let destinationVC = destinationStoryboard.instantiateViewController(withIdentifier: "DynamicLinkView")
let navController = UINavigationController()
navController.setViewControllers([destinationVC], animated: true)
self.window?.rootViewController = navController
}
I use push notifications to inform the user about different types of events happening in the app. A certain type of push notification should open a special viewcontroller (f.e a notification about a new chat message does navigate to the chat on click)
To achieve this, i tried the following code inside my app delegate:
func applicationDidBecomeActive(_ application: UIApplication) {
if var topController = UIApplication.shared.keyWindow?.rootViewController {
while let presentedViewController = topController.presentedViewController {
topController = presentedViewController
}
topController.tabBarController?.selectedIndex = 3
}
}
It does not move anywhere. What am I missing here?
I wrote a simple class to navigate to any view controller in the view hierarchy from anywhere in one line of code by just passing the class type, so the code you'll write will be also decoupled from the view hierarchy itself, for instance:
Navigator.find(MyViewController.self)?.doSomethingSync()
Navigator.navigate(to: MyViewController.self)?.doSomethingSync()
..or you can execute methods asynchronously on the main thread also:
Navigator.navigate(to: MyViewController.self) { (MyViewControllerContainer, MyViewControllerInstance) in
MyViewControllerInstance?.doSomethingAsync()
}
Here's the GitHub project link: https://github.com/oblq/Navigator
This is what you need.
Use your navigation controller to push your notification view controller
let mainStoryBoard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let navigationController : UINavigationController = mainStoryBoard.instantiateViewController(withIdentifier: "MainNavigationController") as! UINavigationController
let notifcontrol : UIViewController = (mainStoryBoard.instantiateViewController(withIdentifier: "NotificationViewController") as? NotificationViewController)!
navigationController.pushViewController(notifcontrol, animated: true)
self.window = UIWindow(frame: UIScreen.main.bounds)
self.window?.rootViewController = navigationController
self.window?.makeKeyAndVisible()
The topController was already my TabBarController in this case!
I'm an android developer. in android, when user login in application, I will re-open the MainActivity class ( controller ) to refresh some views.
in iOS applications, how to do this scenario ?
You can reopen you default/LandingViewController.
Suppose you have a View Controller with name LandingViewController
When you successfully logged in all you need is to re instantiate the LandingViewController
In AppDelegate class make a function with name
func userDidLoggedIn(){
let storyboard = UIStoryboard(name: "Main", bundle: nil)//Replace Main With your own storyboard name containing LandingViewController
let landingViewController = storyboard.instantiateViewController(withIdentifier: "LandingViewControllerIdentifier")//Pass your LandingViewController Identier that you have set in your storyboard file.
guard let subviews = self.window?.subviews else {
return
}
for view in subviews {
view.removeFromSuperview()
}
self.window?.rootViewController = landingViewController
}
Now Simply Call this Function where ever in the entire project like this In your case write below lines in the completion block of login request API.
let delegate = UIApplication.shared.delegate as! AppDelegate
delegate. userDidLoggedIn()
Once user login, you can change your rootviewcontroller like this:
var nav_VC: UIViewController?
func onSuccessfulLogin()
{
let storyboard = UIStoryboard.init(name: "Main", bundle: nil)
nav_VC = nil
if nav_VC == nil {
nav_VC = storyboard.instantiateViewController(withIdentifier: "home_nav")
}
self.window?.rootViewController = nav_VC
self.window?.makeKeyAndVisible()
}
I'm having some troubles with revealViewController in Xcode 7.2 and iOS 9.2.
My app starts with a view controller embedded in a navigation controller to perform a login.
After login, or if the login token is present, I jump to another view controller embedded in a navigation controller with the following code:
let homePage = self.storyboard?.instantiateViewControllerWithIdentifier("HomeViewController") as! HomeViewController
let homePageNav = UINavigationController(rootViewController: homePage)
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
appDelegate.window?.rootViewController = homePageNav
In this home view controller I would like to have a left navigation menu with SWRealViewController.
I had the SWRealViewController view linked with sw_front to my home navigation controller, and the following code:
if (self.revealViewController() != nil) {
self.menuButton.target = self.revealViewController()
self.menuButton.action = "revealToggle:"
self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
But self.revealViewController() always returns nil, so it does not work.
I think I lost the revealViewController somewhere (maybe when I jump from the first navigation controller to the second) but I do not know what to do.
The most convenient to be a reason for the revealViewController to be nil
is you didn't connect segues correctly in stroyboard.
See this tutorial it's quite easy to follow.
Update
If in your case you just need to open a login vc if the user is not logged in you may do like this:
in AppDelegate
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
var rootVCStoryboardId = userIsLoggedin ? "SWRevealViewController" : "LoginViewController"
self.window?.rootViewController = UIStoryboard(name: Storyboards.main, bundle: NSBundle.mainBundle()).instantiateViewControllerWithIdentifier(rootVCStoryboardId)
Where SWRevealViewController is the stroyboard id for SWRevealViewController and LoginViewController is the storyboard id for your login view controller(or its navigation controller if exists).
In case someone is wondering how to do a manual segue, this is what worked for me at the end.
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let sw = storyboard.instantiateViewControllerWithIdentifier("SWRevealViewController") as! SWRevealViewController
self.view.window?.rootViewController = sw
let destinationController = self.storyboard?.instantiateViewControllerWithIdentifier("StoryboardID") as! NameOfViewController
let navigationController = UINavigationController(rootViewController: destinationController)
sw.pushFrontViewController(navigationController, animated: true)
Incase you are skipping login scene based on the current user information, then make sure to instantiate the storyboard with SWRevealViewController. See below code for reference:
if User.currentUser != nil {
//There is a current user
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewControllerWithIdentifier("SWRevealViewController")
window?.rootViewController = vc
}
else{
//No current user
}
I have an app which starts with different VCs depending whether the user is already logged in or not.
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
window = UIWindow.init(frame: UIScreen.mainScreen().bounds)
let storyboard = UIStoryboard.init(name: "Main", bundle: nil)
let initialViewController: UIViewController
if DataManager.getInstance().getUserInfo() == nil {
initialViewController = storyboard.instantiateViewControllerWithIdentifier("authenticationViewController")
} else {
initialViewController = storyboard.instantiateViewControllerWithIdentifier("locationsNavigationViewController")
}
window!.rootViewController = initialViewController;
window!.makeKeyAndVisible();
return true
}
If the user is not logged in, the app starts with AuthenticationViewController, otherwise it starts with LocationsNavigationViewController, which is a NavigationViewController
In the latter VC, the is a button for logout. The problem is when the user taps on that button, I don't know if I have to dismiss the LocationsNavigationViewController (because AuthenticationViewController is in background) or if I have to dismiss LocationsNavigationViewController and perform a segue for opening the AuthenticationViewController.
So far, I have just covered the first use case. So in LocationsNavigationViewController I call this function
func showAuthentication() {
dismissViewControllerAnimated(true, completion: nil)
}
But when the app starts with LocationsNavigationViewController dismiss the VC is not enough of course, because the the AuthenticationViewController has never been instantiated.
How can I solve this please?
self.navigationController?.viewControllers
This is an array which will contain all your previous view controller. You can enumerate it and check whether your view controller is exist or not.
If you are using UINavigationController then you can check any UIViewController present or not!
let rootViewController = application.windows[0].rootViewController as! UINavigationController
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
if !rootViewController.viewControllers.contains(UIViewController_Class()){
let notificationVC = mainStoryboard.instantiateViewControllerWithIdentifier(constInstance.notificationsIdentifier) as! UIViewController_Class_Name
rootViewController.pushViewController(notificationVC, animated: false)
}
Hope this helps!
Thanks to Sohil's answer, I change the showAuthentication function in this way
func showAuthentication() {
//Since the app can start with different VC, I have to check which is the window root VC
if UIApplication.sharedApplication().windows[0].rootViewController is AuthenticationViewController {
dismissViewControllerAnimated(true, completion: nil)
} else {
performSegueWithIdentifier("authenticationSegue", sender: self)
}
}
And added a segue from the NavigationViewController to the AuthenticationViewController, called authenticationSegue
Pretty simple solution.
You can create one function in appdelegate for logout
and in logout function chanege rootviewcontroller of window like
func logoutUser()
{
var login: UIViewController?
login = LoginViewController(nibName : "LoginViewController", bundle : nil)
let nav = UINavigationController(rootViewController: login!)
self.window?.rootViewController = nav
}