react-native 父函数组件调用类子组件的方法(实例详解)

import React, {Component} from 'react';
import {Text, View,  TouchableOpacity} from 'react-native';

// 父
let child
onRefbbb = (ref) => {
    child = ref
}
clickccc = () => {
    child.myName()
}
const Parent =()=> {
        return(
            <View>
                <Child onRefaaa={onRefbbb} />
                <TouchableOpacity onPress={()=>clickccc()}>
                    <Text>onClick</Text>
                </TouchableOpacity>
            </View>
        )
}
export default Parent

// 子
class Child extends Component {
    componentDidMount(){
        this.props.onRefaaa(this)
    }

     myName = () =>{
        alert(11111111111111)
     }

    render() {
        return (<View></View>)
    }
}

import { useRef } from 'react'
// 父组件中代码
const FCom = () => {
    const cRef = useRef(null);
    return (
        <div>
            <ChildCom ref={cRef} />
        </div>
    )
}

import { forwardRef, useImperativeHandle } from 'react'
const ChildCom = forwardRef(({
  // 这里是一些props参数
}, ref) => {
    useImperativeHandle(ref, () => ({
        getData: getData,
        otherFun: otherFun
    }))
    function getData() {
        // to do something
    }
    function otherFun() {
        console.log('这是其他方法')
    }
    return (
        <div>子组件</div>
    )
})

import { useRef } from 'react'
// 修改父组件中代码
const FCom = () => {
    const cRef = useRef(null);
    const handleClick = () => {
        cRef.current && cRef.current.getData()
    }
    return (
        <div>
            <ChildCom ref={cRef} />
        </div>
    )
}