How to tell the active view controller when applicationDidBecomeActive is called?

Question

I feel I am missing a trick here...

I just want to call viewDidLoad or viewDidAppear on the current active view controller when applicationDidBecomeActive gets called, s

Answer 1

Swift version:

You can add this row in your viewDidLoad

NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(viewDidBecomeActive), name: UIApplicationDidBecomeActiveNotification, object: nil)

func viewDidBecomeActive(){
    print("viewDidBecomeActive")
}

Swift 5.x version

NotificationCenter.default.addObserver(self, selector: #selector(viewDidBecomeActive), name: UIApplication.didBecomeActiveNotification, object: nil)

@objc func viewDidBecomeActive() {
    print("viewDidBecomeActive")
}