num ext add padding

lib/extension/num_extension.dart

@@ -11,6 +11,11 @@ extension NumExt on num {
   ///获取 EdgeInsets.all
   EdgeInsets get edge => EdgeInsets.all(this.w);
 
+  EdgeInsets pading(double horizontal, double vertical) => EdgeInsets.symmetric(
+        horizontal: horizontal,
+        vertical: vertical,
+      );
+
   ///圆角
   BorderRadius get radius => BorderRadius.circular(this.w);
 

lib/extension/widget_extension.dart

@@ -2,4 +2,5 @@ import 'package:flutter/material.dart';
 
 extension WidgetExt on Widget {
   Widget get expanded => Expanded(child: this);
+  Widget get center => Center(child: this);
 }