UIStackView+attachToScrollView.swift

extension UIStackView {
    /**
     Fills the given scroll view with this stack view. This method automatically creates
     and activates constraints and adds the stack view to the scroll view.
     
     - parameter scrollView: The scroll view into which this stack view should be inserted.
     */
    internal func attachToScrollView(_ scrollView: UIScrollView) {
        // Add this stack view to the given UIScrollView
        scrollView.addSubview(self)
        
        // Disable automatic constraints from autoresizing mask
        self.translatesAutoresizingMaskIntoConstraints = false
        
        // Create and activate constraints
        self.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor).isActive = true
        self.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor).isActive = true
        self.topAnchor.constraint(equalTo: scrollView.topAnchor).isActive = true
        self.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor).isActive = true
        self.widthAnchor.constraint(equalTo: scrollView.widthAnchor).isActive = true
    }
}