How to pass data from child to parent view controller? in swift

Question

I created an activity where when one of the text fields clicked it will pop up a child(alert dialog) with list of product but when i click one item on the list I can\'t disp

Answer 1

You can use protocols/delegate

Here is a very very straightforward explanation, no bs: https://www.youtube.com/watch?v=guSYMPaXLaw

Or in your situation you can also use NSNotificationCenter

You can do something like this:

The "sender" view controller would do

let nc = NSNotificationCenter.defaultCenter()
nc.postNotificationName("printValue", object: nil, userInfo: ["value" : "Pass Me this string"])

The receiver view controller then can listen to the notification.

let nc = NSNotificationCenter.defaultCenter()
nc.addObserver(self, selector: #selector(printValue), name: "printValue", object: nil)

func printValue(notification:NSNotification) {
    let userInfo:Dictionary = notification.userInfo as! Dictionary
    let item = userInfo["value"]! as String

    print(item,self)
}