addChildViewController方法仅用于将子ViewController添加到containerViewController?

我在苹果上看到了这种方法的描述

func addChildViewController(_ childController: UIViewController)

此方法仅由自定义容器视图控制器的实现调用。如果重写此方法,则必须在实现中调用super。

我明白了,人们使用的例子太多了 addChildViewController 到处都没有 containerViewController .

例如:我没有使用containerView。我在下面添加了类似的内容?°t是否正确?

   // Create child VC
     let childVC = UIViewController()

    // Set child VC
    self.addChildViewController(childVC)

    // Add child VC's view to parent
    self.view.addSubview(childVC.view)

    // Register child VC
    childVC.didMove(toParentViewController: self)

    // Setup constraints for layout
    childVC.view.translatesAutoresizingMaskIntoConstraints = false
    childVC.view.topAnchor.constraint(equalTo: heroView.bottomAnchor).isActive = true
    childVC.view.leftAnchor.constraint(equalTo: self.view.leftAnchor).isActive = true
    childVC.view.widthAnchor.constraint(equalTo: self.view.widthAnchor).isActive = true
    childVC.view.heightAnchor.constraint(equalToConstant: height).isActive = true