Sync stuff with scrollView.swift

extension MyViewController: UIScrollViewDelegate {
	
	func scrollViewDidScroll(_ scrollView: UIScrollView) {
		if scrollView == tableView { // Table view for example
			var scrollY = scrollView.contentOffset.y + scrollView.contentInset.top + 40
			if scrollY < 0 { scrollY = 0 }
			constraintToChange.constant = -scrollY
			
			if 0...10 ~= scrollY { viewToHide.alpha = 1 - (scrollY.rounded() / 10.0) }
			
		}
	}
	
}