Swift - How to set initial value for NSUserDefaults

Question

I have a switch called soundSwitch, I'm saving the state of the button using an userDefault as such:

@IBAction func soundsChanged(sender: AnyObject) {         if soundSwitch.on{             defaults.setBool(true, forKey: "SoundActive")             print("Sound ON")         }else{             defaults.setBool(false, forKey: "SoundActive")             print("Sound OFF")         }     } 

Currently, the actual default value is initially false when the user first launches the application.

How can I implement the defaults to be true if the user launches the app and they haven't been configured yet.

I've seen methods in Objective-C, but nothing in Swift. From what I've seen you can do it in the app delegate somehow, or in a PList file. How do I do either of those ones?

Answer 1

Swift 3 syntax example

Register a boolean default value:

UserDefaults.standard.register(defaults: ["SoundActive" : true]) 

And to get the value:

UserDefaults.standard.bool(forKey: "SoundActive") 

Sidenote: Although the above code will return true, note that the value isn't actually written to disk until you set it:

UserDefaults.standard.set(true, forKey: "SoundActive") 

Answer 2

Add this to your didFinishLaunchingWithOptions method from the AppDelegate. As some others pointed out try not to abuse by putting everything in this method.

 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {      /// Here you can give default values to your UserDefault keys     UserDefaults.standard.register(defaults: [         "SoundActive": true,         "someOtherKey": "Some Message"         ]) }