如何创建可折叠的UIView

let foldableView = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))

let foldButton = UIButton(frame: CGRect(x: 0, y: 0, width: 200, height: 50))
foldButton.setTitle("Fold/Unfold", for: .normal)
foldButton.addTarget(self, action: #selector(foldButtonTapped), for: .touchUpInside)
foldableView.addSubview(foldButton)

@objc func foldButtonTapped() {
    UIView.animate(withDuration: 0.3) {
        if self.foldableView.frame.height == 200 {
            self.foldableView.frame.size.height = 50
        } else {
            self.foldableView.frame.size.height = 200
        }
    }
}

self.view.addSubview(foldableView)