imageView.image = #imageLiteral()
self.view.backgroundColor = #colorLiteral()
imageView = UIImage(named : "diceTwo")
self.view.backgroundColor = UIColor(red: 0.9, green: 0.3, blue: 0.5, alpha: 0.3)
imageView.layer.opacity = 0.5
leftDiceNumber = Int.random(in: 0...5)
0과 5사이에 있는 수를 무작위로 추출