"-[UIBarButtonItem selectedSegmentIndex]: unrecognized selector sent to instance" for segmented control in top UIBar

Question

I am using Swift 4. I have a segmented control on the right of a top UINavigationBar like so:

When I create an outlet from the Storyboard to my code, by default it wants it to be a UIBarButtonItem, but for my action I cannot access selectedSegmentIndex without making it a UISegmentedControl.

So I make my outlet like this:

@IBOutlet weak var saveAsControl: UISegmentedControl!

My action, as a test, is this:

@IBAction func saveAsTypeAction(_ sender: Any) {

    print("tapped")

    switch saveAsControl.selectedSegmentIndex
    {
    case 0:
        print("video selected")
    case 1:
        print("gif selected")
    default:
        break;
    }

}

If I tap the segmented control, the debugger crashes and has the message:

-[UIBarButtonItem selectedSegmentIndex]: unrecognized selector sent to instance

So I have no idea how to get the segmented control working. Seems like it has something to do with the UINavigationBar, but I have no idea why it would be a problem.

Answer 1

You likely wired up your outlets wrong. Here is the correct setup:

Note that both the outlet and the action are wired to the segmented control and not the bar button itself.