使用Xamarin開發移動應用示例——數獨遊戲（三）新增回退和計時功能

尋找無名的特質發表於2022-01-26
遊戲

專案程式碼可以從Github下載：https://github.com/zhenl/ZL.Shudu 。程式碼隨專案進度更新。

我們已經建立了可以執行數獨遊戲的基本介面，現在為遊戲增加一些功能，首先是計時功能，數獨作為一種智力遊戲，完成時間是重要的指標。還有就是回退功能，在很多情況下，遊戲過程中需要試錯，如果進入死局，需要能夠回到上幾步，再試一個新的路徑，如果沒有這個功能，只能重新開始，降低遊戲的吸引力。

計時功能的實現比較簡單，只要在開始和完成時記錄時間，計算出時間差並顯示就可以了。回退功能可以使用堆疊完成，將每一操作步驟放入堆疊，從堆疊中彈出一條記錄，就是回退的一步。

首先增加兩個變數，記錄開始時間和回退過程：

        private DateTime dtBegin;
        private Stack<string> steps = new Stack<string>();

然後，在開始遊戲的時候，記錄開始時間，並將堆疊清零：

            steps.Clear();
            dtBegin = DateTime.Now;

            this.lbFinish.IsVisible = false;
            this.lbTime.IsVisible = false;
            this.lbMessage.IsVisible = false;

在輸入數字後，記錄下輸入的位置和值，存入堆疊：


            if (!checkval(x, y, num))
            {
                return;
            }
            steps.Push(x + "," + y + "," + num);
            currentButton.Text = currentNumBtn.Text;

增加響應回退的事件：


        private void btn_Reset_Clicked(object sender, EventArgs e)
        {
            if (steps.Count > 0)
            {
                var laststep = steps.Pop();
               
                var arr = laststep.Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
                int x = int.Parse(arr[0]), y = int.Parse(arr[1]), num = int.Parse(arr[2]);
                buttons[x, y].Text = "";
            }
        }

在完成的時候，顯示耗時時間：

            if (IsFinish())
            {
                lbFinish.IsVisible = true;
                lbTime.IsVisible = true;
                rowResult.Height = 40;
                var diff = (DateTime.Now.Ticks - dtBegin.Ticks) / 10000 / 1000 / 60;
                lbTime.Text = diff + "分鐘";
            }

還需要增加新遊戲的功能，目前只有一個遊戲，再多增加一些，現在只簡單實現這個功能，將一些遊戲儲存在陣列中，開始遊戲時隨機抽取一個。程式碼如下：

        private static int[,,] chesses =  {
           {
            {5,3,0,0,7,0,0,0,0},
            {6,0,0,1,9,5,0,0,0},
            {0,9,8,0,0,0,0,6,0},
            {8,0,0,0,6,0,0,0,3},
            {4,0,0,8,0,3,0,0,1},
            {7,0,0,0,2,0,0,0,6},
            {0,6,0,0,0,0,2,8,0},
            {0,0,0,4,1,9,0,0,5},
            {0,0,0,0,8,0,0,7,9}
            },
            {
            {3,0,2,4,0,7,9,0,1},
            {0,0,7,1,3,8,5,0,0},
            {6,0,0,0,0,0,0,0,4},
            {0,0,0,0,4,0,0,0,0},
            {0,9,4,0,0,0,1,5,0},
            {0,0,0,0,9,0,0,0,0},
            {4,0,0,0,0,0,0,0,5},
            {0,0,8,9,1,5,6,0,0},
            {5,0,9,6,0,4,7,0,2}
        },{
            {0,8,0,9,0,7,0,1,0},
            {9,0,0,3,8,6,0,0,5},
            {0,0,2,0,4,0,6,0,0},
            {5,9,0,0,0,0,0,2,6},
            {0,2,3,0,0,0,7,9,0},
            {7,4,0,0,0,0,0,5,1},
            {0,0,9,0,7,0,5,0,0},
            {4,0,0,8,5,9,0,0,2},
            {0,5,0,4,0,2,0,3,0}
        },{
            {4,0,8,0,0,0,0,0,5},
            {0,0,9,0,0,4,0,7,0},
            {3,1,0,2,0,0,8,0,0},
            {0,0,5,7,0,0,0,8,0},
            {0,0,0,0,9,0,0,0,0},
            {0,2,0,0,0,3,5,0,0},
            {0,0,2,0,0,9,0,1,4},
            {0,3,0,6,0,0,9,0,0},
            {1,0,0,0,0,0,7,0,6}
        },{
            {0,3,5,0,0,7,0,6,0},
            {8,0,6,0,1,0,0,0,7},
            {0,0,0,0,9,6,0,1,5},
            {4,0,1,8,0,3,0,0,0},
            {0,2,3,0,0,0,6,4,0},
            {0,0,0,6,0,2,3,0,1},
            {3,8,0,7,2,0,0,0,0},
            {6,0,0,0,3,0,7,0,9},
            {0,7,0,9,0,0,4,8,0}
        },{
            {0,0,0,7,0,4,0,0,0},
            {0,0,0,8,0,5,0,0,0},
            {5,8,0,0,0,0,0,4,7},
            {7,6,0,0,0,0,0,3,9},
            {9,2,0,6,1,3,0,7,8},
            {8,5,0,0,0,0,0,2,1},
            {1,7,0,0,0,0,0,9,3},
            {0,0,0,3,0,6,0,0,0},
            {0,0,0,1,0,7,0,0,0}
        },{
            {0,7,0,0,9,0,2,0,0},
            {0,0,0,0,0,7,0,0,5},
            {2,0,4,3,5,0,7,0,0},
            {0,5,0,0,4,0,9,0,0},
            {9,0,3,5,0,1,4,0,8},
            {0,0,7,0,6,0,0,1,0},
            {0,0,8,0,1,9,3,0,2},
            {7,0,0,2,0,0,0,0,0},
            {0,0,2,0,3,0,0,9,0}
        },{
            {3,0,2,4,0,7,9,0,1},
            {0,0,7,1,3,8,5,0,0},
            {6,0,0,0,0,0,0,0,4},
            {0,0,0,0,4,0,0,0,0},
            {0,9,4,0,0,0,1,5,0},
            {0,0,0,0,9,0,0,0,0},
            {4,0,0,0,0,0,0,0,5},
            {0,0,8,9,1,5,6,0,0},
            {5,0,9,6,0,4,7,0,2}
        }
        };

修改生成新遊戲的函式：

        private void SetNewGame()
        {
            int k;
            var lst = chesses;
            var leng = lst.GetLength(0);

            if (ra == null)
            {
                ra = new Random();
            }

            k = ra.Next(0, leng);
           
            var mychess = new int[9, 9];
            for (var i = 0; i < 9; i++)
                for (var j = 0; j < 9; j++)
                {
                    mychess[i, j] = chesses[k, i, j];
                }

            SetGame(mychess);
        }

好了，到這裡遊戲基本上已經初步完成了，專案程式碼可以從Github下載：https://github.com/zhenl/ZL.Shudu 。程式碼隨專案進度更新。
現在可以在手機上啟動一個新的遊戲試試了，當你玩了一會兒，忽然有個電話進來，接完電話，再回到遊戲，What?原來的進度都丟了！下一步我們需要在本地儲存當前的進度。

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