How to Pass information Back in iOS when reversing a Segue using Swift?

Question

I have two view controllers, One and Two. I go from VC One to VC Two. On VC Two, I select some data that I store in an array. When I press the \"Back\" button on the navigat

Answer 1

You can also use the Notification Design Pattern (Post & Observe), which is mainly used to pass on the same object/information from one VC to multiple View Controllers.

For your scenario : In VC2.swift :

@IBAction func BackBtn(sender: UIButton) {  
  NSNotificationCenter.defaultCenter().postNotificationName("ThisIsTheMessage", object: nil, userInfo:["ObjectBeingSent":yourObject])

}

And in VC1.swift :

override func viewDidLoad() {
        super.viewDidLoad()
        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("yourFunction:"), name: "ThisIsTheMessage", object: nil)
    }



func yourFunction(theNotification : NSNotification) {

           if let extractInfo = theNotification.userInfo {
     //code to use the object sent from VC2, by extracting the object details
    }
     }