Detect first launch of iOS app [duplicate]

Question

This question already has answers here:

iOS app first launch (5 answers)

Closed 2 years ago.

I am trying to find a way in Swift to detect the first launch.

Answer 1

In case of Swift In applicationdidFinishLaunchingWithOptions in AppDelegate Add:

 if NSUserDefaults.standardUserDefaults().boolForKey("isFirstLaunch") {

        NSUserDefaults.standardUserDefaults().setBool(true, forKey: "isFirstLaunch")
        NSUserDefaults.standardUserDefaults().synchronize()
    }

And Use this wherever you want to.

let isFirstLaunch = NSUserDefaults.standardUserDefaults().valueForKey("isFirstLaunch") as? Bool
    if isFirstLaunch {
    //It's the initial launch of application.
    }
    else {
    // not initial launch
    }

Answer 2

let applicationLaunchedOnce: Bool = {
        let launchedOnce = NSUserDefaults.standardUserDefaults().boolForKey(UserDefaultsService.ApplicationLaunchedOnce)
        if launchedOnce {
            return launchedOnce
        } else {
            NSUserDefaults.standardUserDefaults().setBool(true, forKey: UserDefaultsService.ApplicationLaunchedOnce)
            NSUserDefaults.standardUserDefaults().synchronize()
            return false
        }
    }()

Answer 3

Typically you would write a value to NSUserDefaults to indicate that an app has launched before.

let launchedBefore = NSUserDefaults.standardUserDefaults().boolForKey("launchedBefore")
if launchedBefore  {
    print("Not first launch.")
}
else {
    print("First launch, setting NSUserDefault.")
    NSUserDefaults.standardUserDefaults().setBool(true, forKey: "launchedBefore")
}

UPDATE - Swift 3

let launchedBefore = UserDefaults.standard.bool(forKey: "launchedBefore")
if launchedBefore  {
    print("Not first launch.")
} else {
    print("First launch, setting UserDefault.")
    UserDefaults.standard.set(true, forKey: "launchedBefore")
}