Spiral traversal of matrix in swift

Swift program for Spiral traversal of matrix. Here more information.

import Foundation;
// Swift 4 program
// Spiral form of 2d array
class SpiralView
{
    func spiral(_ data: [[Int]], _ startRow: Int, _ startCol: Int, 
      _ endRow: Int, _ endCol: Int, _ element1: Int)
    {
        var i: Int = startCol;
        var element : Int = element1;
        // Left to right
        while (i <= endCol && element > 0)
        {
            element -= 1;
            print("  ", data[startRow][i], terminator: "");
            i += 1;
        }
        i = startRow + 1;
        // Top to down
        while (i <= endRow && element > 0)
        {
            element -= 1;
            print("  ", data[i][endCol], terminator: "");
            i += 1;
        }
        i = endCol - 1;
        // Bottom right to bottom-left
        while (i >= startCol && element > 0)
        {
            element -= 1;
            print("  ", data[endRow][i], terminator: "");
            i -= 1;
        }
        i = endRow - 1;
        // Bottom left to top
        while (i > startRow && element > 0)
        {
            element -= 1;
            print("  ", data[i][startRow], terminator: "");
            i -= 1;
        }
        if (startRow + 1 <= endRow - 1 && element > 0)
        {
            // Recursive call
            self.spiral(data, startRow + 1, 
                        startCol + 1, endRow - 1, endCol - 1, element);
        }
    }
}
func main()
{
    let task: SpiralView = SpiralView();
    // 2d matrix
    let matrix: [
        [Int]
    ] = [
        [1, 2, 3, 4, 5, 6],
        [22, 23, 24, 25, 26, 7],
        [21, 36, 37, 38, 27, 8],
        [20, 35, 42, 39, 28, 9],
        [19, 34, 41, 40, 29, 10],
        [18, 33, 32, 31, 30, 11],
        [17, 16, 15, 14, 13, 12]
    ];
    let row: Int = matrix.count;
    let col: Int = matrix[0].count;
    // Get the number of element
    let element: Int = row * col;
    task.spiral(matrix, 0, 0, row - 1, col - 1, element);
}
main();

Output

   1   2   3   4   5   6   7   8   9   10   11   12   13   14   15   16   17   18   19   20   21   22   23   24   25   26   27   28   29   30   31   32   33   34   35   36   37   38   39   40   41   42