Swift cant delete view from superview

Question

Im new in swift and im trying to do some custom think. I have MainViewController and this controller has bgView. I set ViewController1 and ViewController2 to MainViewController in bgView. But when i set ViewController1 and ViewController2 many times the app starts to freeze

MainViewController code

@IBOutlet weak var bgView: UIView!

add and remove Controller from bgView

private func add(asChildViewController viewController: UIViewController) {
        // Add Child View Controller
        addChild(viewController)

        // Add Child View as Subview
        bgView.addSubview(viewController.view)

        // Configure Child View
        viewController.view.frame = bgView.bounds
        viewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]

        // Notify Child View Controller
        viewController.didMove(toParent: self)
    }
    
    private func remove(asChildViewController viewController: UIViewController) {
        // Notify Child View Controller
        viewController.willMove(toParent: nil)

        // Remove Child View From Superview
        viewController.view.removeFromSuperview()
        
        // Notify Child View Controller
        viewController.removeFromParent()
    }

Answer 1

等待大神答复