BottomSheetTransitioningDelegate.swift

class BottomSheetTransitioningDelegate: NSObject {
    let transition: BottomSheetTransition
    
    override init() {
        self.transition = BottomSheetTransition()
    }
}

    
extension BottomSheetTransitioningDelegate: UIViewControllerTransitioningDelegate {
    
    func animationController(
        forPresented presented: UIViewController,
        presenting: UIViewController,
        source: UIViewController
    ) -> UIViewControllerAnimatedTransitioning? {
        transition.presenting = true
        transition.wantsInteractiveStart = false
        return transition
    }
    
    func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        transition.presenting = false
        return transition
    }
    
    func interactionControllerForDismissal(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
        transition.presenting = false
        return transition
    }
    
    func presentationController(
        forPresented presented: UIViewController,
        presenting: UIViewController?,
        source: UIViewController
    ) -> UIPresentationController? {
        BottomSheetPresentationController(presentedViewController: presented,
                                          presenting: presenting)
    }
}