ios - 使用自定义转换时如何处理呈现 UIViewController 中的方向更改

Question

我有一个 UIViewController 作为 Root View Controller ，它使用自定义转换呈现另一个 UIViewController。当您在查看 subview Controller 的同时旋转设备，然后返回到 Root View Controller 时， Root View Controller 的 View 框架不会更新。我已将其范围缩小到存在自定义过渡，即如果您没有自定义过渡，它也可以正常工作。进行自定义转换并让 Root View Controller 适当处理方向更改的最佳方法是什么？

我这里有一个演示项目:https://github.com/rawbee/TestOrientation

Answer 1

似乎您只是忘记为正在呈现的 View Controller 设置框架:

toVC.view.frame = fromVC.view.frame

只需将这一行添加到 animateTransition 中，方法如下所示:

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
    guard let fromVC = transitionContext.viewController(forKey: .from),
        let toVC = transitionContext.viewController(forKey: .to),
        let snapshot = fromVC.view.snapshotView(afterScreenUpdates: false)
        else { return }

    let containerView = transitionContext.containerView

    // you want the newly presented view to have the same frame as the old one
    toVC.view.frame = fromVC.view.frame

    containerView.addSubview(toVC.view)
    containerView.addSubview(snapshot)

    let animator = UIViewPropertyAnimator(duration: transitionDuration(using: transitionContext), curve: .easeInOut) {
        snapshot.alpha = 0.0
    }
    animator.addCompletion { _ in
        snapshot.removeFromSuperview()
        transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
    }
    animator.startAnimation()
}