如何在 animationController (UIViewControllerTransitioningDelegate) 中使用源（不呈现）？

Question

我正在制作自定义过渡管理器。它符合协议 UIViewControllerAnimatedTransitioning & UIViewControllerTransitioningDelegate.

当 present 从 RocketsVC 到 RocketDetailsVC 时，函数被调用 animationController(for Presented presented: UIViewController, presenting: UIViewController, source: UIViewController)，下面的类型被传递到那里：

presented: RocketDetailsViewController
presenting: MainTabBarController (错误在这里)
source: RocketsViewController

此函数在 TransitionManager.swift:

中声明

func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    type = .presentation
    return self // TransitionManager
}

然后调用animateTransition方法...

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
    guard let fromViewController = transitionContext.viewController(forKey: .from) as? TransitionManagerProtocol,
        let toViewController = transitionContext.viewController(forKey: .to) as? TransitionManagerProtocol

...零效果，因为 MainTabBarController 不符合 TransitionManagerProtocol.

如果我在没有 MainTabBarController 的情况下构建项目（rootVC 是 RocketsVC），那么一切正常。

我应该怎么做才能使转换工作正常？ 我犯了 MainTabBarController，但也许有办法以某种方式传递给 animationController 方法 source 而不是 presenting?

Full code is in my GitHub

TransitionManager.swift
RocketsViewController.swift
MainTabBarController.swift

Answer 1

经过漫长的时间我找到的解决方案：

private var fromVC: UIViewController?
private var toVC: UIViewController?

...

func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    type = .presentation
    fromVC = source
    toVC = presented
    return self
}

func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    type = .dismissal
    toVC = fromVC // last `fromVC` is now `toVC`
    fromVC = dismissed // and now we set this to fromVC
    return self
}

并且：

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
    guard let fromViewController = fromVC as? TransitionManagerProtocol,
          let toViewController = toVC as? TransitionManagerProtocol
    else {
        transitionContext.completeTransition(false)
        return
    }
    ...

如何在 animationController (UIViewControllerTransitioningDelegate) 中使用源（不呈现）？

How to use source (not presenting) in animationController (UIViewControllerTransitioningDelegate)?

uikit

ios

swift