React Hook 父子组件相互调用方法

1.子组件调用父组件函数方法

//父组件
let Father=()=>{
    let getInfo=()=>{
        
    }
    return ()=>{
        <div>
            <Children 
                getInfo={getInfo}
            />
        </div>
    }
}

//子组件
let Children=(param)=>{
    return ()=>{
        <div>
            <span onClick={param.getInfo}>调用父组件函数</span>
        </div>
    }
}

子组件调用父组件函数，可以向父组件传参，刷新父组件信息

2.父组件条用子组件函数方法

//父组件
//需要引入useRef
import {useRef} from 'react'
let Father=()=>{
    const childRef=useRef();
    let onClick=()=>{
        childRef.current.getInfo();
    }
    return ()=>{
        <div>
            <Children 
                ref={childRef}
            />
            <span onClick={onClick}>调用子组件函数</span>
        </div>
    }
}

//子组件 
//需要引入useImperativeHandle,forwardRef
import {useImperativeHandle,forwardRef} from 'react'
let Children=(ref)=>{
    useImperativeHandle(ref, () => ({
        getInfo:()=>{
            //需要处理的数据
        }
    }))
    return ()=>{
        <div></div>
    }
}
Children = forwardRef(Children);

useImperativeHandle 需要配合着 forwardRef 使用，要不就会出现以下警告

Warning: Function components cannot be given refs. Attempts to access this ref will fail. Did you mean to use React.forwardRef()?