Passing data between viewControllers in swift - swift

Question

I was wondering if their were ways to send data to another view as soon as one view loads. I'm trying to make an app that stores something like a highScore but the only way to pass the data from the gameOver view to the mainMenu is if they click main menu and using the prepareForSegue method. Is their a way I could send it in like the viewDidLoad function?
Thanks!

Answer 1

According you use an UINavigationController, GameOverViewController
On your main menu add this code :
override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
let navigationController = segue.destinationViewController as UINavigationController
let gameOverVC = navigationController.topViewController as GameOverViewController
gameOverVC.highScore = 26
}
If you don't use an UINavigationController :
override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
let gameOverVC = segue.destinationViewController as GameOverViewController
gameOverVC.highScore = 26
}
Then, add your highScore var : var highScore: NSString! like this :
class GameOverViewController: UIViewController {
var highScore: NSString!
override func viewDidLoad() {
println(self.highScore)
}
}
It should works.
If not, please add more code in your post.
EDIT :
By this way, you will just pass data forward, not backward. To pass backward use Delegation, Singleton, NSNotificationCenter or NSUserDefaults

Answer 2

To pass data backward side, i.e. from second view to first, there are option like Delegation Pattern and NSNotificationCenter.
Suppose we using NSNotificationCenter.
In your case, We need to Send highScore to MainMenu from GameOver Class.
Register your notification.(in viewDidLoad of MainMenu Class)
NSNotificationCenter.defaultCenter().addObserver(self, selector: "updateHighScoreFromGameOver:", name: "notificationUpdateHighScoreFromGameOver", object: nil)
Create method to handle posted notification. (in MainMenu Class)
#objc func updateHighScoreFromGameOver(notification: NSNotification){
NSNumber highScore = notification.object;
}
Post Notification When your game is Over(next line after displaying game over message).
NSNotificationCenter.defaultCenter().postNotificationName("notificationUpdateHighScoreFromGameOver", object: hightScore_ofTypeNSNumber)
Remove observer once you are done. (in viewWillAppear of MainMenu Class)
NSNotificationCenter.defaultCenter().removeObserver(self name: "notificationUpdateHighScoreFromGameOver", object: nil);
//alternatively you can remove all observers on this object:
NSNotificationCenter.defaultCenter().removeObserver(self);
Note : If you will not remove previous added observer and add it again, the method will be called two times. If you add same observer third time, the method will be called three times, and so on.