BottomSheetPresentationController_10.swift

private func didInteractionEnd() {
    guard let presentedView = presentedView else {
        return
    }
    
    if let transitioningDelegate = transitioningDelegate {
        let dismissFraction = transitioningDelegate.transition.dismissFractionComplete
        
        if dismissFraction > dismissThreshold {
            transitioningDelegate.transition.finish()
            presentedViewController.dismiss(animated: true)
        } else {
            transitioningDelegate.transition.cancel()
            UIView.animate(withDuration: 0.3) {
                presentedView.transform = .identity
            }
        }
    } else {
        UIView.animate(withDuration: 0.3) {
            presentedView.transform = .identity
        }
    }
}