Swift exchange variables between View and its ViewController

Question

I have a ViewController:

class graphicViewController: UIViewController {
    var pathToFile = "" //it's changed in method PrepareForSegue from previous ViewController
}

and I have a View:

class graphicView: UIView {
   var ltr:String?
   override func drawRect(rect: CGRect) {
      println(ltr!)
   }
}

How and where should I implement access/transfer of variable pathToFile that it must not be null in drawRect?

Is graphicView the type view in your graphicViewController ? — Mike S
– Mike S, Commented Oct 21, 2014 at 19:33
@Mike, graphicView is the subview of graphicViewController. I can access graphicView like this: graphicViewController.view as graphicView — Olexiy Pyvovarov
– Olexiy Pyvovarov, Commented Oct 21, 2014 at 19:54

Mike S · Accepted Answer · 2014-10-21 20:32:12Z

1

Since you're setting your pathToFile property in prepareForSegue, the best place to pass the value of the property on would be would be in graphicViewController's viewDidLoad function:

override func viewDidLoad() {
    if let gView = view as? graphicView {
        gView.ltr = pathToFile
    }
}

Sidenote: Typically you'll want to name your types with a capital letter and your instances with a lower case letter. So, graphicView would be GraphicView, etc.

answered Oct 21, 2014 at 20:32

Mike S

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