与 ViewController 的 present 转场动画不同

1, 导航控制器，pushViewController 的转场动画，的代理是

navigationController?.delegate = self

2, 指定动画的办法

extension Two: UINavigationControllerDelegate{        func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationController.Operation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {        if operation == .push{            return navAnimatorPush        }        else{            return nil        }    }    }

具体的动画设置也不同

应用 snapshotView , 会呈现奇怪的成果

代码很好了解

class NavBaseCustomAnimatorPush: NSObject, UIViewControllerAnimatedTransitioning{        func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {        return 1    }            func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {         guard let fromCtrl = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from),               let toCtrl = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to), let fromView = fromCtrl.view, let toView = toCtrl.view else{             return         }                         let containerView = transitionContext.containerView        let f = UIScreen.main.bounds                fromView.frame = f        containerView.addSubview(fromView)        containerView.addSubview(toView)                toView.frame = presentingDirection.offsetF(withFrame: f)                 UIView.animate(withDuration: transitionDuration(using: transitionContext), delay: 0.0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.0, options: .curveLinear) {             toView.frame = f         } completion: { _ in             let success = !transitionContext.transitionWasCancelled             transitionContext.completeTransition(success)         }     }    }

github repo