final class Foo: long chain of derivation leading to UIViewController {
    override func viewIsAppearing(_ animated: Bool) {
        // ...
        super.viewIsAppearing(animated)
    }
}

Xcode 13.4.1：viewIs出现：方法不重写其超类中的任何方法
部署目标为13.0
如何覆盖viewIsAppearing？