An extension on UIScrollView that adds vars to check if the scroll view can scroll.

UIScrollView+CanScroll.swift

extension UIEdgeInsets {
  var horizontalSum: CGFloat {
    return left + right
  }
  
  var verticalSum: CGFloat {
    return top + bottom
  }
}

extension UIScrollView {
  var canScrollVertically: Bool {
    return contentSize.height + contentInset.verticalSum > frame.height
  }
  
  var canScrollHorizontally: Bool {
    return contentSize.width + contentInset.horizontalSum > frame.width
  }
  
  var canScroll: Bool {
    return canScrollHorizontally || canScrollVertically
  }
}