在swift中创建Tic Tac Toe Grid？

import UIKit

class TicTacToeGridView: UIView {
    private let gridSize: CGFloat = 3
    private var cellSize: CGFloat = 0
    
    override func layoutSubviews() {
        super.layoutSubviews()
        
        cellSize = bounds.width / gridSize
        
        for row in 0..<Int(gridSize) {
            for col in 0..<Int(gridSize) {
                let cellFrame = CGRect(x: CGFloat(col) * cellSize, y: CGFloat(row) * cellSize, width: cellSize, height: cellSize)
                let cellView = UIView(frame: cellFrame)
                cellView.layer.borderWidth = 1.0
                cellView.layer.borderColor = UIColor.black.cgColor
                addSubview(cellView)
            }
        }
    }
}

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let gridView = TicTacToeGridView(frame: CGRect(x: 50, y: 50, width: 300, height: 300))
        view.addSubview(gridView)
    }
}