import UIKit


enum FooType {
    case one
    case two
}


typealias Permutation = () -> (Void)


@objcMembers
class CatalogItem: NSObject {


    var t: FooType
    var permutation: Permutation?


    required init(t: FooType) {
        self.t = t
    }
}


@objcMembers
class Subclass: CatalogItem {
    convenience init() {
        self.init(t: .one)


        self.permutation = { [weak self] in
            print(self?.t)
        }
    }
}


class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        let s = Subclass() // EXC_BAD_ACCESS !
    }
}