Reactjs React Native:在React钩子中将Ref从父对象传递给子对象

Reactjs React Native:在React钩子中将Ref从父对象传递给子对象,reactjs,react-native,Reactjs,React Native,我尝试了几种不同的方法,但无法找出将ref从父对象传递给子对象的确切语法。最终,我试图使它,以便我可以滚动到开始按下一个子组件。有人能帮我弄清楚吗 获取错误:`scrollViewRef.scrollTo不是函数' import React, { useRef } from 'react'; import { ScrollView, Button } from 'react-native'; const Parent = () => { const scrollViewRef =

我尝试了几种不同的方法,但无法找出将ref从父对象传递给子对象的确切语法。最终,我试图使它,以便我可以滚动到开始按下一个子组件。有人能帮我弄清楚吗

获取错误:`scrollViewRef.scrollTo不是函数'

import React, { useRef } from 'react';
import { ScrollView, Button } from 'react-native';

const Parent = () => {

  const scrollViewRef = useRef();

  const scrollToBeginning = () => {
    scrollViewRef.scrollTo({ x: 0, animated: true });
  }

  return (
    <ScrollView
      ref={ scrollViewRef }
      pagingEnabled
      snapToInterval={ width }
      horizontal
      scrollEventThrottle={16}
      scrollEnabled={ true }
    >
      <Child
        scrollToBeginning={ scrollToBeginning }
      >
    </ScrollView>
  )
}


const Child = (props) => {
  return (
    <Button onPress={ props.scrollToBeginning } title="Scroll To Beginning" />
  )
}
import React,{useRef}来自“React”;
从“react native”导入{ScrollView,Button};
常量父项=()=>{
const scrollViewRef=useRef();
常量滚动开始=()=>{
scrollViewRef.scrollTo({x:0,动画:true});
}
返回(
)
}
const Child=(道具)=>{
返回(
)
}

您需要使用
scrollViewRef.current.scrollTo({x:0,动画:true})因为ref属性已分配给ref对象中的当前变量

const Parent = () => {

  const scrollViewRef = useRef();

  const scrollToBeginning = () => {
    scrollViewRef..current.scrollTo({ x: 0, animated: true });
  }

  return (
    <ScrollView
      ref={ scrollViewRef }
      pagingEnabled
      snapToInterval={ width }
      horizontal
      scrollEventThrottle={16}
      scrollEnabled={ true }
    >
      <Child
        scrollToBeginning={ scrollToBeginning }
      >
    </ScrollView>
  )
}
const Parent=()=>{
const scrollViewRef=useRef();
常量滚动开始=()=>{
scrollViewRef..current.scrollTo({x:0,动画:true});
}
返回(
)
}
函数
scrollTo()
不直接存在于ref上。您必须使用
窗口。scrollTo
ref.current。scrollTo
检查此项: