Swift: Attaching instance variable to view controller

Question

if i have a ViewController, which has an instance ShowAlert. showAlert will show an alert controller, but is there any way the instance showAlert can know about who instantiated it? i.e. is there any way not to pass self to ShowAlert's instance variable viewController and instead infer it by parent or something similar? should i somehow be delegating this, instead?

class ViewController: UIViewController {
    var showAlert = ShowAlert()

    override viewDidLoad() {
        super.viewDidLoad()
        showAlert.viewController = self
        showAlert.now()
    }
}

class ShowAlert: NSObject {

    var viewController: UIViewController!

    func now() {
        let alert = UIAlertController(title: "Title", message: "Message", preferredStyle: .Alert)
        viewController.showViewController(alert, sender: self)
    }

}

thanks -

stackoverflow.com/questions/24594238/…

Shades
– Shades

2016-03-03 01:24:08 +00:00
Commented Mar 3, 2016 at 1:24 — Shades
– Shades, Commented Mar 3, 2016 at 1:24

Michael Dautermann · Accepted Answer · 2016-03-03 01:23:26Z

1

sure instead of:

func now() {

do:

func now(parentVC : UIViewController ){
  let alert = UIAlertController(title: "Title", message: "Message", preferredStyle: .Alert)
    parentVC.showViewController(alert, sender: self)
}

and you can call it like:

showAlert.now(self)

answered Mar 3, 2016 at 1:23

Michael Dautermann

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