1、在自组件中重要的是这句代码GlobalKey<_ChildState>globalKey=GlobalKey(); import'package:flutter/material.dart';GlobalKey<_ChildState>globalKey=GlobalKey();classChildextendsStatefulWidget{Child({Keykey,}):super(key:key);@override_ChildStatecreateState()=>_ChildState();}class_ChildStateextendsSt...