On View did load (when u need to execute some code after view is loaded in uiviewcontroller)

onviewdidload

class SuperViewController: UIViewController {
    typealias VoidClosure = () -> Void
    private var onViewDidLoad: [VoidClosure] = []

     // public
     func addOnViewdidLoad(block: @escaping VoidClosure) {
        if isViewLoaded {
            block()
        } else {
            self.onViewDidLoad.append(block)
        }
    }
}

// example usage ,on a subclass 
addOnViewDidLoad {
            self.priceLabel.text = "230"
 }