ios - 如何将 UINavigationControllerDelegate 中的自定义过渡动画应用于特定的推送和弹出事件？

Question

我在 UINavigationController 堆栈中有一个用于推送和弹出事件的自定义动画转换，我只想将该自定义动画应用于特定的推送事件——例如，在推送 RandomViewController44() 或弹出 RandomViewController27() 时——不是每个在堆栈中推送和弹出。这是在 UINavigationControllerDelegate 中、在动画对象中还是在推送/弹出点完成的？


代表

extension BaseViewController: UINavigationControllerDelegate {

    func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationControllerOperation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        switch operation {
        case .push:
            return InAnimator()
        case .pop:
            return OutAnimator()
        default:
            return nil
        }
    }

}

动画对象

class InAnimator: NSObject, UIViewControllerAnimatedTransitioning {

    let animationDuration = 0.5

    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return animationDuration
    }

    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {

        let screenHeight = UIScreen.main.bounds.height
        let screenWidth = UIScreen.main.bounds.width
        let containerView = transitionContext.containerView
        let toViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to)

        containerView.addSubview(toViewController!.view)

        toViewController!.view.frame = CGRect(x: screenWidth * -1, y: 0, width: screenWidth, height: screenHeight)

        UIView.animate(withDuration: animationDuration, animations: {
            toViewController!.view.frame = CGRect(x: 0, y: 0, width: screenWidth, height: screenHeight)
        }, completion: { finished in
            let cancelled = transitionContext.transitionWasCancelled
            transitionContext.completeTransition(!cancelled)
        })

    }

}

推送的调用

func pushVC() {
    navigationController?.pushViewController(randomViewController44(), animated: true)
}

Answer 1

您可以在下面的委托(delegate)方法中检查 fromView 和 ToView Controller 以执行操作

extension BaseViewController: UINavigationControllerDelegate {

    func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationControllerOperation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        switch operation {
        case .push:
            if toVc is RandomViewController44{
               return InAnimator()
            }
            return nil
        case .pop:
            if RandomViewController27 is fromVC{
              return OutAnimator()
            }
            return nil
        default:
            return nil
        }
    }
}

当此方法根据您的要求作为设置条件调用时，您需要检查 from 和 toView Controller