Ios swift – Protocol delegate from custom UI button has unwanted effect

I have been trying to create a protocol and delegate between custom UI button and parent-child view controller. Briefly, I have a parent view controller, a child view controller, and a custom UI button. Custom UI button and child VC are under parent VC. I created a protocol delegate for custom UI button.

I want to change child VC’s view frame origin with a tap on custom UI button. I also want to change the image of custom UI button when the button is tapped. However, when I try to change the image of custom UI button and also call delegate method, child VC view first update the child VC view frame position as in update view method. But later it resets frame position to its first position. Here is the sample code:

Parent View Controller

class ParentViewController: UIViewController {
    
    let childVC: ChildViewController = {
        let childVC = ChildViewController()
        childVC.view.translatesAutoresizingMaskIntoConstraints = false
        return childVC
    }()
    
    let customButton: CustomUIButton = {
        let button = CustomUIButton(frame: .zero)
        button.translatesAutoresizingMaskIntoConstraints = false
        return button
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white
        
        setupCustomButton()
        setupChildVC()
    }
    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        applyConstraints()
    }
    
    private func setupCustomButton() {
        view.addSubview(customButton)
        customButton.delegate = self
    }
    
    private func setupChildVC() {
        addChild(childVC)
        view.addSubview(childVC.view)
        childVC.didMove(toParent: self)
    }
    
    private func applyConstraints() {
        
        let childVCConstraints = [
            childVC.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            childVC.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            childVC.view.heightAnchor.constraint(equalToConstant: 65),
            childVC.view.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -200)
        ]
        
        let customButtonConstraints = [
            customButton.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            customButton.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -50),
            customButton.heightAnchor.constraint(equalToConstant: 70),
            customButton.widthAnchor.constraint(equalToConstant: 70)
        ]
        
        NSLayoutConstraint.activate(childVCConstraints)
        NSLayoutConstraint.activate(customButtonConstraints)
        
    }

    
}

extension ParentViewController: CustomUIButtonDelegate {
    func customUIButtonDidTap() {
        self.childVC.updateView()
    }
    
    
}

Child View Controller

class ChildViewController: UIViewController {
    
    var isHidden: Bool = false

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .systemBlue
        

    }
    
    func updateView() {
        if isHidden {
            UIView.animate(withDuration: 0.3) {
                self.view.frame.origin.y -= 200
                self.isHidden = false
            }
        } else {
            UIView.animate(withDuration: 0.3) {
                self.view.frame.origin.y += 200
                self.isHidden = true
            }
        }
    }
}

Custom UI Button

protocol CustomUIButtonDelegate: AnyObject {
    func customUIButtonDidTap()
}

class CustomUIButton: UIButton {

    weak var delegate: CustomUIButtonDelegate?
    
    var isDoing: Bool = false
    
    let image1: UIImage = {
        let image = UIImage(systemName: "chevron.right") ?? UIImage()
        return image
    }()
    
    let image2: UIImage = {
        let image = UIImage(systemName: "chevron.left") ?? UIImage()
        return image
    }()
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setTitle("", for: .normal)
        backgroundColor = .systemRed
        layer.cornerRadius = 35
        layer.shadowColor = UIColor.systemCyan.cgColor
        layer.shadowOpacity = 0.8
        layer.shadowOffset = CGSize(width: 0, height: 0)
        
        addTarget(self, action: #selector(didButtonTapped), for: .touchUpInside)
    }
    
    @objc func didButtonTapped() {
        
        self.isDoing = !isDoing
        self.setImage(isDoing ? image1 : image2 , for: .normal)
        
        delegate?.customUIButtonDidTap()
        
    }
}

If I dont change the image of custom UI button in the delegate method, it works without resetting frame position to its first position. I am not sure why setting image of button has this effect.

Custom UI Button target without updating image of custom button

@objc func didButtonTapped() {
        
//        self.isDoing = !isDoing
//        self.setImage(isDoing ? image1 : image2 , for: .normal)

     delegate?.customUIButtonDidTap()
        
}