Failed to set () user-defined validation property (UIButton)

Question

In a simple ViewController, I added one UIButton. I would like to use Custom Runtime Attributes. At the moment, I have added the default Bool attribute.

The button is @IBOutlet:

@IBOutlet var button:UIButton!

The link in the storyboard is complete.

I have nothing else in my application.

I got this error:

2017-03-26 20:31:44.935319+0200 ISAMG[357:47616] Failed to set (keyPath) user defined inspected property on (UIButton): 
[<UIButton 0x15e3a780> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key keyPath.

I don’t understand what I am missing.

EDIT 1

Following @timaktimak's advice, I created a custom UIButton class:

@IBDesignable
class ChoiceButton: UIButton {

    @IBInspectable var keyPath: Bool! {
        didSet {
            print("didSet viewLabel, viewLabel = \(self.keyPath)")
        }
    }

    required init(coder aDecoder: NSCoder)  {
        super.init(coder: aDecoder)!
    }
}

The error is the same:

2017-03-26 22:32:27.389126+0200 ISAMG[429:71565] Failed to set (keyPath) user defined inspected property on (ISAMG.ChoiceButton): 
[<ISAMG.ChoiceButton 0x14e8f040> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key keyPath.

Answer 1

Well, your button does not have a property called keyPathto set it to something.

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Answer 2

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Answer 3

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