in tutorials/tutorial2/TicTacToe/TicTacToe/TicTacToeViewController.swift [47:59]
func setCell(atRow row: Int, col: Int, withPlayerType playerType: PlayerType) {
let indexPathRow = row * GameConstants.colCount + col
let color: UIColor = {
switch playerType {
case .red:
return UIColor.red
case .blue:
return UIColor.blue
}
}()
let cell = collectionView.cellForItem(at: IndexPath(row: indexPathRow, section: Constants.sectionCount - 1))
cell?.backgroundColor = color
}