medium_BottomSheetViewController_3.swift

class BottomSheetViewController: UIViewController {
    // ...
    // sub-class of this view controller will call this function to set a content
    func setContent(content: UIView) {
        contentView.addSubview(content)
        NSLayoutConstraint.activate([
            content.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
            content.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
            content.topAnchor.constraint(equalTo: contentView.topAnchor),
            content.bottomAnchor.constraint(equalTo: contentView.bottomAnchor)
        ])
        view.layoutIfNeeded()
    }
}