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Swift UILabel is nil (error) when app goes in background


Rather than trying to hold a reference to your view controller from your app delegate, it is better to simply have your view controller subscribe to the foreground entry event -

In your viewDidLoad add the following

NSNotificationCenter.defaultCenter().addObserver(self,
selector: Selector("enteringForeground:"),
  name:
UIApplicationWillEnterForegroundNotification,
object: nil)

The add a function to your ViewController

func enteringForeground(notification:
NSNotification) {
   // Whatever you need to do to refresh UI
   // DO NOT CALL viewDidLoad
}

deinit {

  
NSNotificationCenter.defaultCenter().removeObserver(self)

}

Categories : IOS

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