类代码

app_builder.dart

// 老中医2023-02-23
import 'package:flutter/material.dart';

class AppBuilder extends StatefulWidget {
  final Function(BuildContext context,bool reload) builder;

  const AppBuilder({Key? key,required this.builder}) : super(key: key);

  @override
  AppBuilderState createState() => new AppBuilderState();

  static AppBuilderState of(BuildContext context) {
    return context.findAncestorStateOfType<AppBuilderState>()!;
  }
}

class AppBuilderState extends State<AppBuilder> {
  var show = true;
  var reload = false;

  @override
  Widget build(BuildContext context) {
    return show ? widget.builder(context,reload) : SizedBox();
  }

  Future<void> rebuild() async {
    reload = true;
    setState((){
      show = false;
    });
    await Future.delayed(const Duration(milliseconds:100));
    setState((){
      show = true;
    });
  }
}

使用方法

在你的UI树的根部如下定义

Widget build(BuildContext context) {
    return AppBuilder(
      // reload参数是 应用程序是否第一次绘制 第一次为false 第二次为true
      builder:(context,reload){
        return ...;
      }
    );
  }

在需要重绘时调用此方法

AppBuilder.of(Get.context!).rebuild();