在React中，父组件可以使用ref来访问子组件的方法或属性。子组件包含一个表单， 使用forwardRef、useImperativeHandle：forwardRef允许组件使用ref将 DOM 节点暴露给父组件，使用useImperativeHandle暴露方法给父组件。

        子组件：

import React, { forwardRef, useImperativeHandle } from 'react';
import { Form } from "antd";const SubApp = (props, ref) => {const [form] = Form.useForm();useImperativeHandle(ref, () => ({formFields: form,}));return (<Form form={form} ref={ref} >...</Form>);
};export default forwardRef(SubApp);

        父组件：

import React, { useRef } from "react";
import { Button } from "antd";
import SubApp from "./subApp";const FatherApp = () => {const formRef = useRef(null);// 查询按钮触发const query = () => {// 获取自定义条件form表单值if (formRef.current) {const { formFields } = formRef.current;// 首先进行表单校验formFields.validateFields().then(() => {const values = formFields.getFieldsValue();console.log(values);});}}return (<Button type= "primary" onClick = { query } > 查询 </Button><SubApp ref = { formRef } />);
};export default FatherApp;