DismissViewController Swift

Question

My app has the following flow if the user is logged in

Loading Screen -----> Main Screen -----> Rest of App

and the following flow if he's not :

Loading Screen -----> Login Screen -----> Main Screen -----> Rest of App

Now I am implementing the Logout feature. I have added the following code into main Screen :

func handleLogout() {
        if self.presentingViewController != nil {
            var vc = self.presentingViewController
            while ((vc!.presentingViewController) != nil) {
                vc = vc!.presentingViewController
            }
            vc?.dismissViewControllerAnimated(true, completion: {
            })
        }
}

This works fine if the 1st path is followed (the user was logged in when the app was launched) as the app returns to the Loading Screen and then loads up the Login Screen as expected. However, if the 2nd path was followed (the user was not logged in when the app was launched, and Login Screen has been used) this code leads to the Login Screen being opened directly and the whole logout process failing. Is there a way I can ensure that the Loading Screen is the one which is always loaded by this code regardless of which of the two paths have been followed.

Are you using storyboards? If so, simply create an unwind segue to loading screen and call that from wherever you need to — Paulw11
– Paulw11, Commented Aug 6, 2016 at 22:50

Sweeper · Accepted Answer · 2016-08-07 01:05:04Z

1

Use unwind segues!

You basically add an unwind segue connecting your "main screen" and "login screen". Give it an identifier and you can initiate the segue whenever you want. In handleLogout:

func handleLogout() {
    self.performSegueWithIdentifier("your identifier", sender: self)
}

For details of how to create an unwind segue: https://www.andrewcbancroft.com/2015/12/18/working-with-unwind-segues-programmatically-in-swift/

answered Aug 7, 2016 at 1:05

Sweeper

292k23 gold badges260 silver badges438 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Muli Yulzary · Accepted Answer · 2016-08-06 23:36:33Z

This is just a suggestion here goes:

In AppDelegate file you can do something similar to this:

 func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        //Implement this method
        let userLoggedIn = isUserLoggedIn();
        if !userLoggedIn {
            let storyboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
            //Instantiate the login view controller
            window?.rootViewController = storyboard.instantiateViewControllerWithIdentifier("login")
            window?.makeKeyAndVisible()
        }

        return true
    }

Now when the app starts it'll first check the user's login state and display the appropriate view.

Note: this is assuming you use storyboards and the root view controller is set to the Main Screen

cdlJSmith · Accepted Answer · 2016-08-06 23:52:18Z

0

If you are using Storyboards, I would suggest creating storyboard that is used purely for your login view/s. Then in the AppDelegate DidFinishLoading method, you can show the login storyboard if they need to login or show the main storyboard if they are already logged in. You can swap out storyboards at anytime and its easy to do. That will help simplify the flow a bit. This is what I usually do in my apps. If you need sample code just let me know.

answered Aug 6, 2016 at 23:52

cdlJSmith

11 silver badge

Collectives™ on Stack Overflow

DismissViewController Swift

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related