Creating a First Launch Viewcontroller

How to present a different view controller only at first launch of iOS app (Swift) - programmatically

You can try to save that state in UserDefaults

if !UserDefaults.standard.bool(forKey: "LaunchedBefore") {
    window!.rootViewController = LaunchViewController()
    UserDefaults.standard.set(true, forKey: "LaunchedBefore")
} else {
    window!.rootViewController = ViewController()

}
window!.makeKeyAndVisible()

How can I change initial view controller after first launch?

after your app lauch, it will call the didFinishLaunchingWithOptions method in the app delegate:

   func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // here you have the chance to change your rootview controller
    if(UserDefaults.standard.bool(forKey: "notFirstInApp") == false){
        UserDefaults.standard.set(true, forKey: "notFirstInApp")
        window?.rootViewController = your tutorial view controller
    }else{
        window?.rootViewController = your main viewcontroller
    }

    return true
}

Have ViewController appear only on first launch

There is no way to tell if it's the first launch built into the UIKit framework, however you can do it another way.

In AppDelegate.swift, go to applicationDidFinishLaunchingWithOptions method (the first one, usually). Now, add this:

//Check for key "first_launch" in User Defaults
if let _ = NSUserDefaults.standardUserDefaults().objectForKey("first_launch") {

    //Set your own global variable to be true. Then, when your ViewController 
    //loads, do a popup window with that DoctorViewController thingy if the
    //variable is true
    //Example:
    isFirstLaunch = true

    //Then, set "first_launch" to be a value so your app will never call this block again 
    NSUserDefaults.standardUserDefaults().setObject("", forKey: "first_launch")

}

Creating a first launch viewcontroller

Create a new ViewController. Import the header in appDelegate.h file also create a instance variable of that class with name initialViewController.

Change your else condition like:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
   self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
   if ([[NSUserDefaults standardUserDefaults] boolForKey:@"HasLaunchedOnce"])
   {
       NSLog(@"not first launch");
       self.viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
       self.window.rootViewController = self.viewController;
   }
   else
   {
       [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"HasLaunchedOnce"];
       [[NSUserDefaults standardUserDefaults] synchronize];

       self.initialViewController = [[InitialViewController alloc] initWithNibName:@"InitialViewController" bundle:nil];
       self.window.rootViewController = self.InitialViewController;
       NSLog(@"first launch");
   }
   [self.window makeKeyAndVisible];
   return YES;
}

Create a ViewController that shows on First Launch Only

I think you can do something like this

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.backgroundColor = [UIColor whiteColor];

    BOOL userHasOnboarded = [[NSUserDefaults standardUserDefaults] boolForKey:@"isFirstTime"];

    if (userHasOnboarded) {
        [self setupNormalRootViewControllerAnimated:YES];
    }

    else {
        self.window.rootViewController = [self PushExplanation];
    }
    [self.window makeKeyAndVisible];
    return YES;
}

- (void)setupNormalRootViewControllerAnimated:(BOOL)animated {
    UIViewController *mainVC = [UIViewController new];
    mainVC.title = @"Home View Controller";

    if (animated) {
        [UIView transitionWithView:self.window duration:0.5 options:UIViewAnimationOptionTransitionCrossDissolve animations:^{
            self.window.rootViewController = [[UINavigationController alloc] initWithRootViewController:mainVC];
        } completion:nil];
    }

    else {
        self.window.rootViewController = [[UINavigationController alloc] initWithRootViewController:mainVC];
    }
}

In your PushExplanation method you can show the UIviewController you want to show once and then in the same UIViewController you can ask for Push Notifications like this

[[UIApplication sharedApplication] registerForRemoteNotificationTypes:
 (UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];

Hope this help you

Creating ViewController to only run first time the application is run iOS

I would go with your approach of presenting a modal on top of your root view controller when you detect first launch.

Use presentViewController:animated:completion: to display it, with animated: set to NO. That way it will appear on top of the root view controller and cover it. Then when you're done with the first view controller you can dismiss it and reveal your root view controller underneath.

Change initial view controller after first launch of app

For one of my apps, where I did similar to this, I have my "main" view controller check on viewDidLoad for a setting in the default settings that would indicate if the user had signed in. If they hadn't, I immediately pushed the loginViewController without animation and the user filled in the appropriate forms. When that was dismissed, I reloaded the view in my main view controller.

My client liked the app and it looked nice.

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