Use a generic class as a custom view in Interface Builder

Question

I have a custom subclass of UIButton:

import UIKit

@IBDesignable
class MyButton: UIButton {

    var array : [String]?

}

It is IBDesignab

Answer 1

It is possible to use generic UIView in Interface Builder. Let's say you have:

class A: UIView {}

First you have to inherit your generic view to make it non-generic:

class B: A {}

Go ahead and use B class in Interface Builder.

After it you can make @IBOutlet connection in your code:

@IBOutlet var b: B

It will produce error, so to get rid of it make it use UIView class instead, and downcast it like so:

@IBOutlet var b: UIView

var _b: B {
    b as! B
}

Done, now your _b variable is type of B, and it works.