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

For swift 4 make these changes.

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