Best Way to Implement an Intro Sequence? Swift - ios

Question

I'm trying to add an intro sequence to my code so that if it's the first time the app is opened, the user can enter some basic information (which I can then store in UserDefaults).
The way that I was thinking of doing this is by having a variable called isFirstTime which is initially set to true. Every time the app is opened, it'll check if there is a value for isFirstTime in UserDefaults. If it isn't there, it'll trigger the View Controller that has my intro sequence to appear. Once the intro sequence is finished, isFirstTime will be set to false and then stored in UserDefaults.
Is this a correct implementation, or is there a more efficient way?
EDIT: If anyone is interested, this is the code I used to implement my intro sequence. I first assign a boolean variable outside of my View Controller that keeps track of whether it's the first time opening the app or not.
var isFirstTime = true
Then, in my ViewDidAppear (it does not work in the ViewDidLoad method), I added this code which checks whether or not I already have a UserDefault for my isFirstTime variable. If yes, I then execute the rest of my program, but if not, I start up my intro sequence's View Controller.
if UserDefaults.standard.object(forKey: "isFirstTime") != nil{
// Not the first time app is opened
isFirstTime = false // I use isFirstTime elsewhere in my code too.
} else {
let introVC = self.storyboard?.instantiateViewController(withIdentifier: "intro")
self.present(introVC!, animated: false, completion: nil)
}
In my intro sequence View Controller, when I am done with my gathering the user's basic information, I do two things: the first is changing the value of isFirstTime and setting it as a UserDefault, and the second is dismissing the View Controller.
isFirstTime = false
UserDefaults.standard.set(isFirstTime, forKey: "isFirstTime")
dismiss(animated: false, completion: nil)

Answer 1

You can achieve it easily. This is code which I have used for it.
Step 1 First create a file called UserDefaultManager.swift
import UIKit
// User Defaults Manager Constants
let kIsFirstTimeLaunch = "IsFirstTimeLaunch"
class UserDefaultsManager: NSObject {
// MARK: Setter Methods
class func setIsFirstTimeLaunch(flag: Bool) {
NSUserDefaults.standardUserDefaults().setBool(flag, forKey:kIsFirstTimeLaunch)
NSUserDefaults.standardUserDefaults().synchronize()
}
// MARK: Getter Methods
class func isFirstTimeLaunch() -> Bool {
return NSUserDefaults.standardUserDefaults().boolForKey(kIsFirstTimeLaunch)
}
// MARK: Reset Methods
class func resetIsFirstTimeLaunch() {
NSUserDefaults.standardUserDefaults().removeObjectForKey(kIsFirstTimeLaunch)
NSUserDefaults.standardUserDefaults().synchronize()
}
}
Step 2: In your Implementation file check it like below :
if(!UserDefaultsManager.isFirstTimeLaunch()) {
// Your code here.
let introVC = self.storyboard?.instantiateViewController(withIdentifier: "intro")
self.present(introVC!, animated: false, completion: nil)
// Update value in user defaults
UserDefaultsManager.setIsFirstTimeLaunch(true)
}