how can I make the uiviewcontroller visible only once during first run of the app (e.g. tutorial)?

Question

I\'m creating an iOS swift app and I want to show tutorial screen when user runs the app for the very first time. Later on, with each run of the app the tutoria

Answer 1

Simplified Swift 4 version of this answer.

https://stackoverflow.com/a/39353299/1565913

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {

    if !UserDefaults.standard.bool(forKey: "didSee") {
         UserDefaults.standard.set(true, forKey: "didSee")

         let storyboard = UIStoryboard(name: "Main", bundle: nil) 
         let viewController = storyboard.instantiateViewController(withIdentifier: "YourViewController")
         self.window?.rootViewController = viewController 
         self.window?.makeKeyAndVisible()
    }

    return true
}

Answer 2

For swift 4 make these changes.

let defaults = UserDefaults.standard
if defaults.object(forKey: "isFirstTime") == nil {
    defaults.set("No", forKey:"isFirstTime")
    defaults.synchronize()
    ...
}

Answer 3

In didFinishLaunchingWithOptions method of AppDelegate check for NSUserDefaults value like this way.

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {

    let defaults = NSUserDefaults.standardUserDefaults()
    if defaults.objectForKey("isFirstTime") == nil {
         defaults.setObject("No", forKey:"isFirstTime")
         let storyboard = UIStoryboard(name: "main", bundle: nil) //Write your storyboard name
         let viewController = storyboard.instantiateViewControllerWithIdentifier("ViewController") as! ViewController
         self.window.rootViewController = viewController 
         self.window.makeKeyAndVisible()
    }
    return true
}

Note: I have created the object of ViewController you need to create the object of your FirstPage tutorial screen after that assign it to the rootViewController.