在从容器视图控制器添加/删除时，如何为子视图控制器设置动画？

我有以下2个函数添加和删除从容器视图控制器触发的子视图控制器：

@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 } 

上面的函数是UIViewController的扩展，所以我所做的只是父视图控制器上的self.addChildViewController（）和self.removeChildViewController（）。

如何在出路时移除视图的动画以及在路上添加的视图？

Answer 1

不同子视图控制器之间的动画： –

 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： – 当前显示的子viewController
• newViewController： – 将要添加的新子视图控制器
• containerView： – 显示所有子控制器的视图。

要为子视图设置动画，可以根据要求将transitionFlipFromLeft替换为可用的UIViewAnimationOptions ，从而使用不同类型的动画样式。

Answer 2

Sagar的答案不完整addSubview方法在那里缺失

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 } 

希望它对某人有帮助