从容器视图控制器添加/删除时，如何使儿童视图控制器动画

Question

i具有以下2个功能，这些功能添加和删除了从容器视图控制器触发的子查看控制器：

@discardableResult func addChildViewController(withChildViewController childViewController: UIViewController) -> UIViewController {
    // Add Child View Controller
    addChildViewController(childViewController)
    childViewController.beginAppearanceTransition(true, animated: true)
    // Add Child View as Subview
    view.addSubview(childViewController.view)
    // Configure Child View
    childViewController.view.frame = view.bounds
    childViewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
    // Notify Child View Controller
    childViewController.didMove(toParentViewController: self)
    return childViewController
}
@discardableResult func removeChildViewController(withChildViewController childViewController: UIViewController) -> UIViewController {
    // Notify Child View Controller
    childViewController.willMove(toParentViewController: nil)
    childViewController.beginAppearanceTransition(false, animated: true)
    // Remove Child View From Superview
    childViewController.view.removeFromSuperview()
    // Notify Child View Controller
    childViewController.removeFromParentViewController()
    return childViewController
}

上面的功能是uiviewController的扩展，因此我要做的就是self.addchildViewController((和parent View Controller上的self.removechildviewController((。

如何在删除其出路时删除视图和在其途中添加的视图？

Answer 1

在不同的子查看控制器之间进行动画： -

func cycleFromViewController(oldViewController: UIViewController, toViewController newViewController: UIViewController) {
    oldViewController.willMove(toParentViewController: nil)
    newViewController.view.translatesAutoresizingMaskIntoConstraints = false
    self.addChildViewController(newViewController)
    self.addSubview(subView: newViewController.view, toView:self.containerView!)
    newViewController.view.alpha = 0
    newViewController.view.layoutIfNeeded()
    UIView.animate(withDuration: 0.5, delay: 0.1, options: .transitionFlipFromLeft, animations: { 
        newViewController.view.alpha = 1
        oldViewController.view.alpha = 0
    }) { (finished) in
        oldViewController.view.removeFromSuperview()
        oldViewController.removeFromParentViewController()
        newViewController.didMove(toParentViewController: self)
    }
}

在上面，

• oldViewController： - 当前显示的儿童ViewController
• NewViewController： - 将要添加
的新儿童视图控制器
• ContainSerview： - 所有子控制器都显示的视图。

要动画孩子视图，您可以通过更换 transitionFlipfromleft 来使用不同类型的动画样式，以可用 uiviewAnimationOptions 根据要求。

Answer 2

Sagar的答案不是完整的addSubview方法

这是完整的答案

func cycleFromViewController(oldViewController: UIViewController, toViewController newViewController: UIViewController) {
        oldViewController.willMove(toParentViewController: nil)
        newViewController.view.translatesAutoresizingMaskIntoConstraints = false
        self.addChildViewController(newViewController)
        self.addSubview(subView: newViewController.view, toView:self.containerView!)
        newViewController.view.alpha = 0
        newViewController.view.layoutIfNeeded()
        UIView.animate(withDuration: 0.5, delay: 0.1, options: .transitionFlipFromLeft, animations: {
            newViewController.view.alpha = 1
            oldViewController.view.alpha = 0
        }) { (finished) in
            oldViewController.view.removeFromSuperview()
            oldViewController.removeFromParentViewController()
            newViewController.didMove(toParentViewController: self)
        }
    }
    //--------------------------------------------------------------------------------

   private func addSubview(subView:UIView, toView parentView:UIView) {
        self.view.layoutIfNeeded()
        parentView.addSubview(subView)
        subView.leadingAnchor.constraint(equalTo: parentView.leadingAnchor).isActive = true
        subView.topAnchor.constraint(equalTo: parentView.topAnchor).isActive = true
        subView.bottomAnchor.constraint(equalTo: parentView.bottomAnchor).isActive = true
        subView.trailingAnchor.constraint(equalTo: parentView.trailingAnchor).isActive  = true
    }

希望这对某人有帮助