Swift: How to pass a Parameter to a function which itself is also a Parameter? -

it's this:

var = 0 button.addtarget(self, action:"showcontent", forcontrolevents: uicontrolevents.touchupinside) 

and function "showcontent" this:

func showcontent(i: int) {     //do sth. } 

i want pass variable function showcontent when button touched, how ?

in target-action pattern, can't that. can either use "showcontent", in case function be:

func showcontent() {  } 

… or can add colon ("showcontent:") in case function be:

func showcontent(sender : uibutton) {     // sender } 

this helps enforce broader model / view / controller pattern making difficult views "smart". instead, model , controller objects should handle i. button displays it's told, , tells controller when it's tapped.

you can read i, , respond it, in appropriate method. example:

class viewcontroller : uiviewcontroller {     var = 0     var button = uibutton(type: .system)     var label = uilabel()      override func viewdidload() {         button.addtarget(self, action:"showcontent", forcontrolevents: uicontrolevents.touchupinside)     }      func showcontent() {         i++         label.text = "current value of i: \(i)"     } }