How to Detect Apps First Launch in iOS

How to detect first time app launch on an iPhone

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    if (![[NSUserDefaults standardUserDefaults] boolForKey:@"HasLaunchedOnce"])
    {
        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"HasLaunchedOnce"];
        [[NSUserDefaults standardUserDefaults] synchronize];
    }
    return YES;
}

How to detect Apps first launch in iOS?

Swift 4 and higher

You can use this anywhere to verify that the user is seeing this view for the first time.

func isAppAlreadyLaunchedOnce() -> Bool {
    let defaults = UserDefaults.standard
    if let _ = defaults.string(forKey: "isAppAlreadyLaunchedOnce") {
        print("App already launched")
        return true
    } else {
        defaults.set(true, forKey: "isAppAlreadyLaunchedOnce")
        print("App launched first time")
        return false
    }
}

Note: This method would return false after user re-installs app and launch first time.

How to check if the IOS app is running for the first time using SWIFT

Try this one

if(NSUserDefaults.standardUserDefaults().boolForKey("HasLaunchedOnce") {
  // App already launched

} else {
  // This is the first launch ever
  NSUserDefaults.standardUserDefaults().setBool(true, forKey: "HasLaunchedOnce")
  NSUserDefaults.standardUserDefaults().synchronize()
}

Swift 3 version->

if (UserDefaults.standard.bool(forKey: "HasLaunchedOnce")) {
   // App already launched

} else {
   // This is the first launch ever         
   UserDefaults.standard.set(true, forKey: "HasLaunchedOnce")
   UserDefaults.standard.synchronize()
}  

How to detect the first launch of an app

Yo created function in function. Either move the isAlreadyLaunchedOnce in the scope (to the same level as viewDidLoad) and call it from viewDidLoad or modify the code like this:

override func viewDidLoad() {
super.viewDidLoad()

println("Launched")

let defaults = NSUserDefaults.standardUserDefaults()
if let isAppAlreadyLaunchedOnce = defaults.stringForKey("isAppAlreadyLaunchedOnce"){
    println("App already launched")
    // do something
} else {
    defaults.setBool(true, forKey: "isAppAlreadyLaunchedOnce")
    println("App launched first time")
    // do something
}

}

How to detect first time app launch on an iPhone

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    if (![[NSUserDefaults standardUserDefaults] boolForKey:@"HasLaunchedOnce"])
    {
        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"HasLaunchedOnce"];
        [[NSUserDefaults standardUserDefaults] synchronize];
    }
    return YES;
}

Presenting an alert on first time app launch

You can use the UserDefaults class to store simple keys. For example, you could store a boolean that tells you if this is the first launch :

func isFirstLaunch() -> Bool {

    if (!UserDefaults.standard.bool(forKey: "launched_before")) {
        UserDefaults.standard.set(true, forKey: "launched_before")
        return true
    }
    return false
}

Then call this function and do the work you need in case it is the first launch :

if isFirstLaunch() {
   // Do something
}

---

Related Topics