Flutter：常见的页面布局：上边内容可滚动，底部固定一个按钮

常见的布局，内容区域可滚动，底部固定按钮

import 'package:flutter/material.dart';
import 'package:flutter_aidishi/extension/index.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:get/get.dart';
import 'package:tdesign_flutter/tdesign_flutter.dart';
import 'package:flutter_swiper_null_safety/flutter_swiper_null_safety.dart';
import 'index.dart';

class GoodsDetailPage extends GetView<GoodsDetailController> {
  const GoodsDetailPage({super.key});

  //  轮播图
  Widget _buildBanner() {
    return Container(
      width: 375.w,
      height: 500.w,
      color: Colors.blue,
      child: Text("轮播图"),
    );
  }

  // 商品信息
  Widget _buildGoodsName() {
    return Container(
      width: 375.w,
      height: 500.w,
      color: Colors.blue,
      child: Text("商品信息"),
    );
  }

  // 商品详情
  Widget _buildGoodsDetail() {
    return Container(
      width: 375.w,
      height: 500.w,
      color: Colors.blue,
      child: Text("商品详情"),
    );
  }

  // 底部悬浮按钮
  Widget _buildGoodsFoot() {
    return Container(
      width: 375.w,
      height: 50.w,
      color: Colors.white,
      child: Text("底部悬浮按钮"),
    );
  }



  // 顶部的可滚动内容：SingleChildScrollView
  Widget _buildTop(){
    return SingleChildScrollView(
      child: <Widget>[
        _buildBanner(),
        SizedBox(height: 15.w,),
        _buildGoodsName(),
        _buildGoodsDetail(),
      ].toColumn(),
    );
  }

  // 主视图
  Widget _buildView() {
    return <Widget>[
      _buildTop().expanded(),
      _buildGoodsFoot()
    ].toColumn();
  }

  @override
  Widget build(BuildContext context) {
    return GetBuilder<GoodsDetailController>(
      init: GoodsDetailController(),
      id: "goods_detail",
      builder: (_) {
        return Scaffold(
          appBar: AppBar(title: const Text("goods_detail")),
          body: _buildView(),
          backgroundColor: Color(0xffF6F6F6),
        );
      },
    );
  }
}