This is a simple Swift class representing a board

board.swift

import Foundation

class Board {
    
    // Board is quadratic
    var boardSize: Int = 0
    
    // The raw array
    private var data: [[Int]] = []
    
    // Initialize data array
    init (boardsize: Int) {
        for _ in 0...boardsize-1 {
            var row: [Int] = []
            for _ in 0...boardsize-1 {
                row.append(0)
            }
            data.append(row)
        }
        self.boardSize = boardsize
    }
    
    // Check if x and y are valid
    private func checkXY(x: Int, y: Int) -> Bool {
        if x <= boardSize && y <= boardSize {
            return true
        } else {
            return false
        }
    }
    
    // Return field at x,y
    func getField(x: Int, y: Int) -> Int {
        let row = self.data[x]
        return row[y]
    }
    
    // Set field data at x,y
    func setField(data: Int, x: Int, y: Int) {
        self.data [x] [y] = data
    }
}