Do i have to use delegate when I want to change something from on VC in another VC ? SWIFT

Question

I am doing some excercises now. For example I create two view controllers in storybard and I want to change color for example from VC2 in VC1 by clicking button. In this situation delegate is needed or is other way to do it?

Also see [here](https://www.youtube.com/watch?v=7fbTHFH3tl4) — mfaani, Jul 03 '17 at 19:50

score 0 · Accepted Answer · answered Jul 03 '17 at 19:33

0

Normally, yes. But that depends . You can use NotificationCenter, you can use "prepare" function. The delegate is the most common option here. In your case:

protocol ChangeButtonColorDelegate {
    func changeButtonColor() 
}

class VC1 : ChangeButtonColorDelegate... {
    func changeButtonColor() {
        /* change button color here */
    }

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if (segue.identifier == "goto_vc2") {
            (segue.dest as! VC2).delegate = self 
        }
    }
}

class VC2 : ... {
    var delegate : ChangeButtonColorDelegate!
}

answered Jul 03 '17 at 19:33

chr0x

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Thanks a lot. It cleared me everything:) Clear and quick! – motivated Jul 03 '17 at 19:55
Please mark this answer as the right answer so :) – chr0x Jul 03 '17 at 20:04
its the check mark below the counter – chr0x Jul 04 '17 at 17:08

Do i have to use delegate when I want to change something from on VC in another VC ? SWIFT

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