修改第6章示例

第6章Cupertino风格组件/CupertinoAlertDialog对话框组件/main.dart

@@ -13,6 +13,7 @@ class MyApp extends StatelessWidget {
           title: Text('CupertinoAlertDialog组件示例'),
         ),
         body: Center(
+          //添加对话框
           child: CupertinoAlertDialog(
             title: Text('提示'), //对话框标题
             content: SingleChildScrollView(
@@ -24,6 +25,7 @@ class MyApp extends StatelessWidget {
                 ],
               ),
             ),
+            //对话框动作按钮
             actions: <Widget>[
               CupertinoDialogAction(
                 child: Text('确定'),
@@ -39,5 +41,4 @@ class MyApp extends StatelessWidget {
       ),
     );
   }
-}
-
+}

第6章Cupertino风格组件/CupertinoButton按钮组件/main.dart

@@ -13,12 +13,13 @@ class MyApp extends StatelessWidget {
           title: Text('CupertinoButton组件示例'),
         ),
         body: Center(
+          //Cupertino风格按钮
           child: CupertinoButton(
-              child: Text(//按钮label
-                'CupertinoButton',
-              ),
-              color: Colors.blue,//按钮颜色
-              onPressed: (){},//按下事件回调
+            child: Text(//按钮label
+              'CupertinoButton',
+            ),
+            color: Colors.blue,//按钮颜色
+            onPressed: (){},//按下事件回调
           ),
         ),
       ),