CODEWITHSUNDEEP
swift
user2244770
user2244770

Reputation: 19

swift-- Variable button action

I would like to ask a simple question : how can I give a variable to the action in the creation of a button ?

if for create the button use :

 newButton.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)

on Object-c i did 

NSString *selectorName = [NSString stringWithFormat:@"Button%d:",index+1];

[newButton addTarget:self action:NSSelectorFromString(selectorName) forControlEvents:UIControlEventTouchUpInside];

and on Swift ?

Upvotes: 1

Views: 873

Answers (2)

erdekhayser
erdekhayser

Reputation: 6657

You can store Swift Selector structs as a variable. 

let sel : Selector = "buttonTapped:"
button.addTarget(self, action: sel)

If you want the selector to have a variable in it, you can simply add the variable to the string like this:

let sel : Selector = "button\(buttonNumber)tapped"

This makes use of Selector's adoption of the StringLiteralConvertible.

Selectors are mentioned in the Using Swift With Objective C ebook.

Upvotes: 0

Chakalaka
Chakalaka

Reputation: 2827

use NSSelectorFromString

let sel = NSSelectorFromString("Button\(index+1)")

newButton.addTarget(self, action: sel, forControlEvents:UIControlEvents.TouchUpInside)

Upvotes: 1

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