import UIKit

class ViewController: UIViewController {

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(true)

        view.backgroundColor = UIColor.gray

        let width = 50
        let height = 50

        for whiteValue in 0...7 {



        let size = CGSize(width: width, height: height)

        let origin = CGPoint(x: whiteValue * width, y: 100 + height * whiteValue  )

        let frame = CGRect(origin: origin, size: size)


        let viewWhite = UIView(frame: frame)

        viewWhite.backgroundColor = UIColor.white

        view.addSubview(viewWhite)