Factory for reuse Swift UIKIT

UIFactory.swift

struct UIFactory {
    
    struct Utility {
        
        static func box(color: NSColor = .white, superview: NSView? = nil) -> NSBox {
            let box = NSBox(frame: .zero)
            box.boxType = .custom
            box.borderColor = .clear
            box.titlePosition = .noTitle
            box.fillColor = color
            superview?.addSubview(box)
            return box
        }
        
        static func popupButton(itemTitles: [String], superview: NSView? = nil) -> NSPopUpButton {
            let popup = NSPopUpButton(frame: .zero)
            popup.removeAllItems()
            popup.addItems(withTitles: itemTitles)
            popup.selectItem(at: 0)
            popup.resetTitleColor()
            superview?.addSubview(popup)
            return popup
        }
        
        static func dot(color: NSColor, diameter: CGFloat = 6, superview: NSView? = nil) -> MRView {
            let view = NSView(superview: superview)
            view.layer!.cornerRadius = diameter * 0.5
            view.backgroundColor = color
            constrain(view) { view in
                view.width == diameter
                view.height == view.width
            }
            return view
        }
        
    }
    
}