Code Style #5

// instead of
stackView.direction(.row).justifyContent(.spaceBetween).define { (stackView) in
   stackView.addItem(button1).shrink(1).aspectRatio(imageRatio)
   stackView.addItem(button2).marginLeft(10).shrink(1).aspectRatio(imageRatio)
   stackView.addItem(button3).marginLeft(10).shrink(1).aspectRatio(imageRatio)
   stackView.addItem(button4).marginLeft(10).shrink(1).aspectRatio(imageRatio)
}

// use this
stackView
   .direction(.row)
   .align(content: .center)
   .justify(content: .spaceBetween)
   .space(between: 10)
   
stackView.add(button1, button2, button3...)

// using
func add(_ subviews: UIView...) {
   subviews.forEach(addItem)
}