在添加到容器视图控制器或从容器视图控制器中删除时，如何为子视图控制器设置动画？

问题描述

我有以下2个函数，用于添加和删除从容器视图控制器触发的子视图控制器：

I have the following 2 functions that add and remove child view controllers triggered from a container view controller:

@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
}

上面的函数是UIViewController的扩展，所以我要做的就是父视图控制器上的self.addChildViewController（）和self.removeChildViewController（） 。

The functions above are extensions to UIViewController, so all I'm doing is self.addChildViewController() and self.removeChildViewController() on the parent view controller.

如何动画化视图在退出时被移除以及视图在进入时被添加？

How do I animate the view being removed on its way out and the view being added on its way in?

推荐答案

在不同子视图控制器之间进行动画处理：-

Animating between different child view controllers:-

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：-当前显示的子级viewController


• newViewController：-将添加


• containerView的新子视图控制器：-显示所有子控制器的视图。

要制作子视图动画，您可以通过将 transitionFlipFromLeft 替换为可用的来使用不同类型的动画样式> UIViewAnimationOptions （根据要求）。

To animate child view, you can use different type of animation style by replacing transitionFlipFromLeft to available UIViewAnimationOptions according requirement.

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