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在 iOS 13 中，Apple 引入了底部表单演示控制器，其演示和关闭的一部分也是为演示视图控制器的视图设置动画。

我在学习自定义视图控制器演示的同时尝试重新创建它，并通过使用顶部视图控制器的转换协调器的animate(alongsideTransition:completion)方法（下面的代码）并在该块中为演示视图控制器的视图更改设置动画来解决它。在 iOS 14 及更低版本中，这非常适合定期解雇和展开转场（就像这样），但是在 iOS 15 中，当使用展开转场时，根视图控制器的视图没有动画并且看起来像这样，而系统标准底部表仍然看起来在放松的时候很好。是否有一些替代方法可以用来通过 unwind segue 解雇多个 VC？

// This is the animation performed in the animate(...) block
presenter.view.layer.transform = self.transform3D(for: presenter, completed: true)

// This is the function definition
func transform3D(for vc: UIViewController?, completed: Bool) -> CATransform3D {
        
    guard completed else { return .identity }
        
    if let vc = vc as? ScrollViewDismissable, !vc.isPresentedFullScreen {
        
        // Handles the situation when the presenting VC is not the root VC (ViewController)
        let ratio = (UIScreen.main.bounds.width - 32) / UIScreen.main.bounds.width
        let height = frameOfPresentedViewInContainerView.height
        let newHeight = height * ratio
        let translation = (height - newHeight) / 2
            
        return CATransform3D.scale(x: ratio, y: ratio, z: 1.00001).concatenating(.translation(x: 0, y: -translation - 10, z: 1.00001))
            
    } else {
        
        // Takes care of the transform for the root VC
        let fullScreenPresentationExtraHeight: CGFloat = vc is ViewController ? 0 : (20 + 16)
            
        return .scale(x: (UIScreen.main.bounds.width - 32) / UIScreen.main.bounds.width, y: (UIScreen.main.bounds.height + fullScreenPresentationExtraHeight - (newOrigin * 2)) / (UIScreen.main.bounds.height + fullScreenPresentationExtraHeight), z: 1.00001)
    }
}
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