Detect first launch of iOS app [duplicate]

Question

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

Answer 1

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") }