我有一个UIViewController作为根视图控制器,它使用自定义转换呈现另一个UIViewController。在查看子视图控制器的同时旋转设备,然后返回到根视图控制器时,根视图控制器的视图框架不会更新。我已将其缩小到自定义转换的存在,即如果您没有自定义转换,它可以正常工作。拥有自定义转换并让根视图控制器处理方向更改的最佳方法是什么?
我在这里有一个演示项目:https://github.com/rawbee/TestOrientation
答案 0 :(得分:1)
似乎您忘记为正在呈现的视图控制器设置框架:
toVC.view.frame = fromVC.view.frame
只需将此行添加到animateTransition
,以便该方法如下所示:
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()
}