initialize view controler ios swift

ios viewController initialize

    convenience init() {
        self.init(nibName:nil, bundle:nil)
    }
    
    // This extends the superclass.
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    }
    
    // This is also necessary when extending the superclass.
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented") // or see Roman Sausarnes's answer
    }