提交前的快速segue自定义过渡布局

Question

我有两个视图控制器A和B。我可以通过Segue从A转到B，并且通过实现UISegue类在Segue上实现了淡入淡出的动画效果。但是，在设备旋转和展开时会发生问题（从B到A，而在B时发生旋转）。

出现的问题是要显示的视图（视图A）的布局错误。在转换无效之前，请调用诸如setNeedsUpdateConstraints()或layoutSubviews()之类的函数或类似函数。屏幕截图描述了A在风景中打开然后对B进行定位的情况。在B中时，设备会旋转回纵向，然后退绕到A。

segues的Swift代码：

class SegueFadeOut: UIStoryboardSegue {

    override func perform() {
        UIView.transition(from: source.view, to: destination.view, duration: 5.5, options: [.transitionCrossDissolve]) { (success) in
            self.destination.dismiss(animated: false, completion: nil)
        }
    }

}

class SegueFadeIn: UIStoryboardSegue {

    override func perform() {
        let toViewController = self.destination
        let fromViewController = self.source

        let containerView = fromViewController.view.superview

        toViewController.view.alpha = 0.0
        containerView?.addSubview(toViewController.view)

        UIView.animate(withDuration: 0.5, delay: 0, options: .curveEaseInOut, animations: {
            toViewController.view.alpha = 1.0
        }, completion: { success in
            fromViewController.present(toViewController, animated: false, completion: nil)
        })
    }

}

关于如何或在何处实现可解决此布局问题的功能的任何线索？谢谢！

Answer 1

我设法修复了它。我可以在执行动画之前设置帧。我还停止使用UIView.transition(...)函数，因为它在关闭fromViewController时出现了一些错误。

class SegueFadeOut: UIStoryboardSegue {

    override func perform() {
        let toViewController = self.destination
        let fromViewController = self.source

        let containerView = fromViewController.view.superview

        toViewController.view.alpha = 0.0
        // ADDED LINE BELOW
        toViewController.view.frame = fromViewController.view.frame

        containerView?.addSubview(toViewController.view)

        UIView.animate(withDuration: 0.5, delay: 0, options: .curveEaseInOut, animations: {
            toViewController.view.alpha = 1.0
        }, completion: { success in
            fromViewController.dismiss(animated: false, completion: nil)
        })
    }

}