diff --git "a/code/CoinFlip/doc/2020-08-30-\345\276\252\347\216\257\344\271\213\345\246\231\347\224\250.md" "b/code/CoinFlip/doc/2020-08-30-\345\276\252\347\216\257\344\271\213\345\246\231\347\224\250.md"
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+## for循环之妙用
+### 关卡图标的绘制
+如下图所示图标，是如何绘制出来的呢?
+
+![图标绘制](./asserts/coin.png)
+
+#### 代码理解
+for循环的妙用,将图片按照一定的规律给递归分布,后将序列号写上。
+```
+for(int i = 0,i<20,i++){
+    menuBtn ->move(25+(i%4)*70,130+(i/4)*70);
+    label ->setText(QString::number(i+1));
+}
+```
+完整详细代码见下
+```
+  //创建关卡按钮
+    for(int i =0;i<20;i++){
+        MyPushButton * menuBtn = new MyPushButton(":/res/LevelIcon.png");
+        menuBtn ->setParent(this);
+        menuBtn ->move(25+(i%4)*70,130+(i/4)*70);
+
+        //按钮上显示的文字
+        QLabel * label = new QLabel;
+        label ->setParent(this);
+        label ->setFixedSize(menuBtn->width(),menuBtn->height());
+        label ->setText(QString::number(i+1));
+        //设置居中
+        label ->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
+        //移动
+        label->move(25 + (i%4)*70 , 130+ (i/4)*70);
+        //鼠标事件穿透
+        label->setAttribute(Qt::WA_TransparentForMouseEvents,true);
+        //监听选择关卡按钮的信号槽
+        connect(menuBtn,&MyPushButton::clicked,[=](){
+           if(pScene ==NULL){
+               this ->hide();
+               pScene = new PlayScene(i+1);
+               pScene ->setGeometry(this->geometry());
+               chooseSound->play();
+               pScene ->show();
+
+             //监听信号
+            connect(pScene,&PlayScene::chooseSceneBack,[=](){
+                this->setGeometry(pScene->geometry());
+                  this->show();
+                  backSound->play();
+                  delete pScene;
+                  pScene = NULL;
+                              });
+           }
+        });
+```
+### 金币方格的绘制
+
+如下图所示图标，是如何绘制出来的呢?
+
+![图标绘制](./asserts/background.png)
+
+#### 代码理解
+
+```
+    //创建金币的背景图片
+      for(int i = 0 ; i < 4;i++)
+      {
+          for(int j = 0 ; j < 4; j++)
+          {
+             //绘制背景图片
+              QPixmap  pix = QPixmap(":/res/BoardNode.png");
+              QLabel* label = new QLabel;
+              label->setGeometry(0,0,pix.width(),pix.height());
+              label->setPixmap(pix);
+              label->setParent(this);
+              label->move(57 + i*50,200+j*50);
+          }
+      }
+
+```
+
+### 总结
+
+以为两个小例子分别用for 循环完成了多场景的创建，值得借鉴。
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