UINavigationController - 如何更改单个 UIViewController 的动画

Question

我如何才能为单个 UIViewController 推送/弹出自定义动画，并为同一 UINavigationController 中的其他 UIViewControllers 设置默认动画？

我使用UINavigationController 和push/pop 在不同的UIViewController 之间导航。我创建了自定义动画并将自定义UINavigationControllerDelegate 设置为UINavigationController.delegate。它的动画效果很好，但它改变了 UINavigationController 中所有未来推送/弹出的动画样式。

我知道我可以使用它的 transitioningDelegate 更改单个 UIViewController 的动画，但它只有在由 present() 显示而不是推送时才有效。 是否可以仅更改 UINavigationController 中单个 UIViewController 的动画？

Answer 1

您可以从导航控制器检查特定的视图控制器，例如：

UINavigationcontroller.ViewControllers[那个视图控制器的编号]

并在其上应用该动画。

Answer 2

子类 UINavigationController 并使用 CoreAnimation's 过渡来更改这样的推送/弹出动画。

enum TransitionType {
    case fade
    case movein
    case push
    case reveal
}
enum TransitionSubtype {
    case right
    case left
    case top
    case bottom
}

class MyNavigationController: UINavigationController {

    fileprivate func getTransition(by type: TransitionType) -> String? {
        var transition: String?
        switch type {
        case .fade:
            transition = kCATransitionFade
            break
        case .push:
            transition = kCATransitionPush
            break
        case .movein:
            transition = kCATransitionMoveIn
            break
        case .reveal:
            transition = kCATransitionReveal
            break
        default:
            transition = nil
            break
        }
        return transition
    }
    fileprivate func getSubTransition(by type: TransitionSubtype) -> String? {
        var transition: String?
        switch type {
        case .right:
            transition = kCATransitionFromRight
            break
        case .left:
            transition = kCATransitionFromLeft
            break
        case .top:
            transition = kCATransitionFromTop
            break
        case .bottom:
            transition = kCATransitionFromBottom
            break
        default:
            transition = nil
            break
        }
        return transition
    }

    func display(viewController: UIViewController, animated: Bool, animationType: TransitionType = .push, animationSubtype: TransitionSubtype = .left) -> Bool {
        guard  let type = getTransition(by: animationType) else {return false}
        guard  let subtype = getSubTransition(by: animationSubtype) else {return false}
        if animated {
            let transition = CATransition()
            transition.duration = 0.35
            transition.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
            transition.type = type
            transition.subtype = subtype
            self.view.layer.add(transition, forKey: nil)
        }
        _ = self.pushViewController(viewController, animated: false)
        return true
    }
    func hide(animated: Bool, animationType: TransitionType = .push, animationSubtype: TransitionSubtype = .left) -> Bool {
        guard  let type = getTransition(by: animationType) else {return false}
        guard  let subtype = getSubTransition(by: animationSubtype) else {return false}
        if animated {
            let transition = CATransition()
            transition.duration = 0.35
            transition.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
            transition.type = type
            transition.subtype = subtype
            self.view.layer.add(transition, forKey: nil)
        }
        _ = self.popViewController(animated: false)
        return true
    }

}