Set rootViewController based on condition

Question

I am currently working on an application in Xcode 7.2, iOS 9.2 using Swift. I want to have a screen pop up the very first time the user opens the application and get some data and store it permanently. I found a thread where someone asked something similar: Programmatically set the initial view controller using Storyboards have followed the instructions closely, but I can't seem to get it to work the way I want it to.

Here is the modified code from my AppDelegate.swift file.

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    // Override point for customization after application launch.
    self.window = UIWindow(frame: UIScreen.mainScreen().bounds);
    let storyboard = UIStoryboard(name: "Main", bundle: nil);
    var initialViewController: UIViewController;
    print(NSUserDefaults.standardUserDefaults().boolForKey("firstTime"));
    if(!NSUserDefaults.standardUserDefaults().boolForKey("firstTime")){
        initialViewController = storyboard.instantiateViewControllerWithIdentifier("FirstTimeScreen");
    } else {
        initialViewController = storyboard.instantiateViewControllerWithIdentifier("Dashboard");
    }
    self.window?.rootViewController = initialViewController;
    self.window?.makeKeyAndVisible();
    return true
}

In the ViewController.swift file corresponding to the ViewController that should open from the second time onwards, in the viewDidLoad() method, I have the following line of code:

NSUserDefaults.standardUserDefaults().setBool(false, forKey: "firstTime");

Currently the first screen is always opening. The screen which should from the second time onwards is not the root view controller even though the NSUserDefaults value is tested.

I started the application working on a single view controller, and I currently do not have any Navigation Controllers or anything. Just a bunch of individual View Controllers, connected through button segues.

Thank you for taking the time to read this and possibly answer the question.

Answer 1

Looking closely at your logic here, there is a ! in the if statement, which means if firstTime is not true it will show the view controller with identifier FirstTimeScreen . You'll want to remove the !, so that it will show the FirstTimeScreen when it is the first time launching.

Be sure that you store false for firstTime in the FirstTimeScreen , not Dashboard .

Also be sure you register NSUserDefaults with firstTime set to true , otherwise it will be false and never show your FirstTimeScreen .

Answer 2

You need to set "firstTime" to true, instead of false: NSUserDefaults.standardUserDefaults().setBool(false, forKey: "firstTime");

Also, make sure you use NSUserDefaults.standardUserDefaults().synchronize() after that to save the changes.

Answer 3

Try to set firstTime in the didFinishLaunchingWithOptions

    if(NSUserDefaults.standardUserDefaults().objectForKey("firstTime") == nil){
        initialViewController = storyboard.instantiateViewControllerWithIdentifier("FirstTimeScreen");
        NSUserDefaults.standardUserDefaults().setBool(true, forKey: "firstTime");
        NSUserDefaults.standardUserDefaults().synchronize()
    } else {
        initialViewController = storyboard.instantiateViewControllerWithIdentifier("Dashboard");
    }