TransitionCoordinator+Animators.swift

private func createTransitionAnimators(with duration: TimeInterval) -> [UIViewPropertyAnimator] {
    switch state {
    case .open:
        return [
            openPlayerAnimator(with: duration),
            fadeInPlayerAnimator(with: duration),
            fadeOutMiniPlayerAnimator(with: duration)
        ]
    case .closed:
        return [
            closePlayerAnimator(with: duration),
            fadeOutPlayerAnimator(with: duration),
            fadeInMiniPlayerAnimator(with: duration)
        ]
    }
}