ios - Swift - Delegate not calling method from other class -

i'm trying change label's text in view controller when button pressed. here's how i'm setting delegate:

in firstviewcontroller under import uikit

@objc protocol mydelegate{     optional func makescore() } 

in firstviewcontroller under class firstviewcontroller: uiviewcontroller

var delegate:mydelegate? 

in firstviewcontroller when button pressed

delegate?.makescore!() 

in secondviewcontroller (where makescore() located)

class secondviewcontroller: uiviewcontroller, mydelegate 

the makescore() method in secondviewcontroller

func makescore() {     println("worked") } 

it's not logging when button pressed. i'm pretty sure set delegates , protocols correctly. see missing?

note: firstviewcontroller , secondviewcontroller not connected segues. both in scrollview.

i can see added second view controller programmatically these lines:

let vc6 = storyboard.instantiateviewcontrollerwithidentifier("second") as! secondviewcontroller self.addchildviewcontroller(vc6) self.scrollview.addsubview(vc6.view) 

just add 1 line, reads this:

let vc6 = storyboard.instantiateviewcontrollerwithidentifier("second") as! secondviewcontroller self.delegate = vc6 self.addchildviewcontroller(vc6) self.scrollview.addsubview(vc6.view) 

edit: on side node, i'm sure delegate best approach you're trying do. you'd better off making global reference secondviewcontroller, calling on self.vc6.makescore(). delegates typically used calling objects not contained in view controller