一级/二级方案头部高度

lib/commonModel/base/BaseComponent.dart

@@ -3,6 +3,8 @@
  * @date   2019-10-13
  **/
 
+import 'dart:io';
+
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
@@ -502,6 +504,12 @@ Widget baseSliverAppBar(String url,
     elevation: elevation ?? 0,
     expandedHeight: height ?? 200,
     automaticallyImplyLeading: false,
+    bottom: PreferredSize(
+      preferredSize: Size.fromHeight(Platform.isIOS ? -12 : -6),
+      child: SizedBox(
+        height: 0,
+      ),
+    ),
     flexibleSpace: FlexibleSpaceBar(
       background: needpic
           ? CachedNetworkImage(